Fixed two of the most annoying bugs in the universe: Extra sessions and malfunctioning params.
This commit is contained in:
Yaro Kasear
parent
981d3ea933
commit
803eb83ca5
2 changed files with 110 additions and 198 deletions
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@ -239,84 +239,46 @@ class CRUDService(Generic[T]):
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include_total: bool = True,
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) -> "SeekWindow[T]":
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"""
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Transport-agnostic keyset pagination that preserves all the goodies from `list()`:
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- filters, includes, joins, field projection, eager loading, soft-delete
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- deterministic ordering (user sort + PK tiebreakers)
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- forward/backward seek via `key` and `backward`
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Returns a SeekWindow with items, first/last keys, order spec, limit, and optional total.
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Keyset pagination with relationship-safe filtering/sorting.
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Always JOIN all CRUDSpec-discovered paths first; then apply filters, sort, seek.
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"""
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session = self.session
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query, root_alias = self.get_query()
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# Normalize requested fields and compile projection (may skip later to avoid conflicts)
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# Requested fields → projection + optional loaders
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fields = _normalize_fields_param(params)
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expanded_fields, proj_opts = compile_projection(self.model, fields) if fields else ([], [])
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spec = CRUDSpec(self.model, params or {}, root_alias)
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# Parse all inputs so join_paths are populated
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filters = spec.parse_filters()
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order_by = spec.parse_sort()
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# Field parsing for root load_only fallback
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root_fields, rel_field_names, root_field_names = spec.parse_fields()
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spec.parse_includes()
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join_paths = tuple(spec.get_join_paths())
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# Soft delete filter
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# Soft delete
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query = self._apply_not_deleted(query, root_alias, params)
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# Apply filters first
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if filters:
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query = query.filter(*filters)
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# Includes + join paths (dotted fields etc.)
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spec.parse_includes()
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join_paths = tuple(spec.get_join_paths()) # iterable of (path, relationship_attr, target_alias)
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# Relationship names required by ORDER BY / WHERE
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sql_hops: set[str] = _paths_needed_for_sql(order_by, filters, join_paths)
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# Also include relationships mentioned directly in the sort spec
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sql_hops |= _hops_from_sort(params)
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# First-hop relationship names implied by dotted projection fields
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proj_hops: set[str] = _paths_from_fields(fields)
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# Root column projection
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# Root column projection (load_only)
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only_cols = [c for c in root_fields if isinstance(c, InstrumentedAttribute)]
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if only_cols:
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query = query.options(Load(root_alias).load_only(*only_cols))
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# Relationship handling per path (avoid loader strategy conflicts)
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# JOIN all resolved paths, hydrate from the join
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used_contains_eager = False
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joined_names: set[str] = set()
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for _path, relationship_attr, target_alias in join_paths:
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rel_attr = cast(InstrumentedAttribute, relationship_attr)
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name = relationship_attr.key
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if name in sql_hops:
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# Needed for WHERE/ORDER BY: join + hydrate from that join
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query = query.join(target_alias, rel_attr.of_type(target_alias), isouter=True)
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query = query.options(contains_eager(rel_attr, alias=target_alias))
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used_contains_eager = True
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joined_names.add(name)
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elif name in proj_hops:
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# Display-only: bulk-load efficiently, no join
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query = query.options(selectinload(rel_attr))
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joined_names.add(name)
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# Force-join any SQL-needed relationships that weren't in join_paths
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missing_sql = sql_hops - joined_names
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for name in missing_sql:
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rel_attr = cast(InstrumentedAttribute, getattr(root_alias, name))
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query = query.join(rel_attr, isouter=True)
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query = query.options(contains_eager(rel_attr))
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for _base_alias, rel_attr, target_alias in join_paths:
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query = query.join(target_alias, rel_attr.of_type(target_alias), isouter=True)
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query = query.options(contains_eager(rel_attr, alias=target_alias))
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used_contains_eager = True
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joined_names.add(name)
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# Apply projection loader options only if they won't conflict with contains_eager
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if proj_opts and not used_contains_eager:
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query = query.options(*proj_opts)
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# Filters AFTER joins → no cartesian products
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if filters:
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query = query.filter(*filters)
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# Order + limit
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order_spec = self._extract_order_spec(root_alias, order_by) # SA 2.x helper
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# Order spec (with PK tie-breakers for stability)
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order_spec = self._extract_order_spec(root_alias, order_by)
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limit, _ = spec.parse_pagination()
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if limit is None:
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effective_limit = 50
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@ -325,13 +287,13 @@ class CRUDService(Generic[T]):
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else:
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effective_limit = limit
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# Keyset predicate
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# Seek predicate from cursor key (if any)
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if key:
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pred = self._key_predicate(order_spec, key, backward)
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if pred is not None:
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query = query.filter(pred)
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# Apply ordering. For backward, invert SQL order then reverse in-memory for display.
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# Apply ORDER and LIMIT. Backward is SQL-inverted + reverse in-memory.
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if not backward:
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clauses = [(c.desc() if is_desc else c.asc()) for c, is_desc in zip(order_spec.cols, order_spec.desc)]
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query = query.order_by(*clauses)
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@ -345,9 +307,9 @@ class CRUDService(Generic[T]):
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query = query.limit(effective_limit)
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items = list(reversed(query.all()))
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# Tag projection so your renderer knows what fields were requested
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# Projection meta tag for renderers
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if fields:
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proj = list(dict.fromkeys(fields)) # dedupe, preserve order
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proj = list(dict.fromkeys(fields))
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if "id" not in proj and hasattr(self.model, "id"):
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proj.insert(0, "id")
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else:
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@ -370,12 +332,9 @@ class CRUDService(Generic[T]):
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except Exception:
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pass
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# Boundary keys for cursor encoding in the API layer
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# When ORDER BY includes related columns (e.g., owner.first_name),
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# pluck values from the related object we hydrated with contains_eager/selectinload.
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# Cursor key pluck: support related columns we hydrated via contains_eager
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def _pluck_key_from_obj(obj: Any) -> list[Any]:
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vals: list[Any] = []
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# Build a quick map: selectable -> relationship name
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alias_to_rel: dict[Any, str] = {}
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for _p, relationship_attr, target_alias in join_paths:
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sel = getattr(target_alias, "selectable", None)
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@ -383,20 +342,17 @@ class CRUDService(Generic[T]):
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alias_to_rel[sel] = relationship_attr.key
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for col in order_spec.cols:
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key = getattr(col, "key", None) or getattr(col, "name", None)
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# Try root attribute first
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if key and hasattr(obj, key):
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vals.append(getattr(obj, key))
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keyname = getattr(col, "key", None) or getattr(col, "name", None)
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if keyname and hasattr(obj, keyname):
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vals.append(getattr(obj, keyname))
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continue
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# Try relationship hop by matching the column's table/selectable
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table = getattr(col, "table", None)
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relname = alias_to_rel.get(table)
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if relname and key:
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if relname and keyname:
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relobj = getattr(obj, relname, None)
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if relobj is not None and hasattr(relobj, key):
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vals.append(getattr(relobj, key))
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if relobj is not None and hasattr(relobj, keyname):
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vals.append(getattr(relobj, keyname))
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continue
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# Give up: unsupported expression for cursor purposes
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raise ValueError("unpluckable")
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return vals
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@ -404,33 +360,24 @@ class CRUDService(Generic[T]):
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first_key = _pluck_key_from_obj(items[0]) if items else None
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last_key = _pluck_key_from_obj(items[-1]) if items else None
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except Exception:
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# If we can't derive cursor keys (e.g., ORDER BY expression/aggregate),
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# disable cursors for this response rather than exploding.
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first_key = None
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last_key = None
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# Optional total that’s safe under JOINs (COUNT DISTINCT ids)
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# Count DISTINCT ids with mirrored joins
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total = None
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if include_total:
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base = session.query(getattr(root_alias, "id"))
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base = self._apply_not_deleted(base, root_alias, params)
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# same joins as above for correctness
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for _base_alias, rel_attr, target_alias in join_paths:
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base = base.join(target_alias, rel_attr.of_type(target_alias), isouter=True)
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if filters:
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base = base.filter(*filters)
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# Mirror join structure for any SQL-needed relationships
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for _path, relationship_attr, target_alias in join_paths:
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if relationship_attr.key in sql_hops:
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rel_attr = cast(InstrumentedAttribute, relationship_attr)
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base = base.join(target_alias, rel_attr.of_type(target_alias), isouter=True)
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# Also mirror any forced joins
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for name in (sql_hops - {ra.key for _p, ra, _a in join_paths}):
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rel_attr = cast(InstrumentedAttribute, getattr(root_alias, name))
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base = base.join(rel_attr, isouter=True)
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total = session.query(func.count()).select_from(
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base.order_by(None).distinct().subquery()
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).scalar() or 0
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window_limit_for_body = 0 if effective_limit is None and limit == 0 else (effective_limit or 50)
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window_limit_for_body = 0 if effective_limit is None and (limit == 0) else (effective_limit or 50)
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if log.isEnabledFor(logging.DEBUG):
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log.debug("QUERY: %s", str(query))
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@ -475,64 +422,53 @@ class CRUDService(Generic[T]):
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return [*order_by, *pk_cols]
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def get(self, id: int, params=None) -> T | None:
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"""Fetch a single row by id with conflict-free eager loading and clean projection."""
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"""
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Fetch a single row by id with conflict-free eager loading and clean projection.
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Always JOIN any paths that CRUDSpec resolved for filters/fields/includes so
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related-column filters never create cartesian products.
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"""
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query, root_alias = self.get_query()
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# Defaults so we can build a projection even if params is None
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req_fields: list[str] = _normalize_fields_param(params)
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root_fields: list[Any] = []
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root_field_names: dict[str, str] = {}
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rel_field_names: dict[tuple[str, ...], list[str]] = {}
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req_fields: list[str] = _normalize_fields_param(params)
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# Soft-delete guard
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# Soft-delete guard first
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query = self._apply_not_deleted(query, root_alias, params)
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spec = CRUDSpec(self.model, params or {}, root_alias)
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# Optional extra filters (in addition to id); keep parity with list()
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# Parse everything so CRUDSpec records any join paths it needed to resolve
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filters = spec.parse_filters()
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if filters:
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query = query.filter(*filters)
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# Always filter by id
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query = query.filter(getattr(root_alias, "id") == id)
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# Includes + join paths we may need
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# no ORDER BY for get()
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if params:
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root_fields, rel_field_names, root_field_names = spec.parse_fields()
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spec.parse_includes()
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join_paths = tuple(spec.get_join_paths())
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# Field parsing to enable root load_only
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if params:
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root_fields, rel_field_names, root_field_names = spec.parse_fields()
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# Decide which relationship paths are needed for SQL vs display-only
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# For get(), there is no ORDER BY; only filters might force SQL use.
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sql_hops = _paths_needed_for_sql(order_by=None, filters=filters, join_paths=join_paths)
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proj_hops = _paths_from_fields(req_fields)
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# Root column projection
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# Root-column projection (load_only)
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only_cols = [c for c in root_fields if isinstance(c, InstrumentedAttribute)]
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if only_cols:
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query = query.options(Load(root_alias).load_only(*only_cols))
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# Relationship handling per path: avoid loader strategy conflicts
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# JOIN all discovered paths up front; hydrate via contains_eager
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used_contains_eager = False
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for _path, relationship_attr, target_alias in join_paths:
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rel_attr = cast(InstrumentedAttribute, relationship_attr)
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name = relationship_attr.key
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if name in sql_hops:
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# Needed in WHERE: join + hydrate from the join
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query = query.join(target_alias, rel_attr.of_type(target_alias), isouter=True)
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query = query.options(contains_eager(rel_attr, alias=target_alias))
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used_contains_eager = True
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elif name in proj_hops:
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# Display-only: bulk-load efficiently
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query = query.options(selectinload(rel_attr))
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else:
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pass
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for _base_alias, rel_attr, target_alias in join_paths:
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query = query.join(target_alias, rel_attr.of_type(target_alias), isouter=True)
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query = query.options(contains_eager(rel_attr, alias=target_alias))
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used_contains_eager = True
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# Apply filters (joins are in place → no cartesian products)
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if filters:
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query = query.filter(*filters)
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# And the id filter
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query = query.filter(getattr(root_alias, "id") == id)
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# Projection loader options compiled from requested fields.
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# Skip if we used contains_eager to avoid strategy conflicts.
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# Skip if we used contains_eager to avoid loader-strategy conflicts.
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expanded_fields, proj_opts = compile_projection(self.model, req_fields) if req_fields else ([], [])
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if proj_opts and not used_contains_eager:
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query = query.options(*proj_opts)
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@ -541,7 +477,7 @@ class CRUDService(Generic[T]):
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# Emit exactly what the client requested (plus id), or a reasonable fallback
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if req_fields:
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proj = list(dict.fromkeys(req_fields)) # dedupe, preserve order
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proj = list(dict.fromkeys(req_fields))
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if "id" not in proj and hasattr(self.model, "id"):
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proj.insert(0, "id")
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else:
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@ -569,16 +505,20 @@ class CRUDService(Generic[T]):
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return obj or None
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def list(self, params=None) -> list[T]:
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"""Offset/limit listing with smart relationship loading and clean projection."""
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"""
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Offset/limit listing with relationship-safe filtering.
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We always JOIN every CRUDSpec-discovered path before applying filters/sorts.
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"""
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query, root_alias = self.get_query()
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# Defaults so we can reference them later even if params is None
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req_fields: list[str] = _normalize_fields_param(params)
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root_fields: list[Any] = []
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root_field_names: dict[str, str] = {}
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rel_field_names: dict[tuple[str, ...], list[str]] = {}
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req_fields: list[str] = _normalize_fields_param(params)
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if params:
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# Soft delete
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query = self._apply_not_deleted(query, root_alias, params)
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spec = CRUDSpec(self.model, params or {}, root_alias)
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@ -586,84 +526,56 @@ class CRUDService(Generic[T]):
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order_by = spec.parse_sort()
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limit, offset = spec.parse_pagination()
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# Includes + join paths we might need
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# Includes / fields (populates join_paths)
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root_fields, rel_field_names, root_field_names = spec.parse_fields()
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spec.parse_includes()
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join_paths = tuple(spec.get_join_paths())
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# Field parsing for load_only on root columns
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root_fields, rel_field_names, root_field_names = spec.parse_fields()
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if filters:
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query = query.filter(*filters)
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# Determine which relationship paths are needed for SQL vs display-only
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sql_hops = _paths_needed_for_sql(order_by, filters, join_paths)
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sql_hops |= _hops_from_sort(params) # ensure sort-driven joins exist
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proj_hops = _paths_from_fields(req_fields)
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# Root column projection
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# Root column projection (load_only)
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only_cols = [c for c in root_fields if isinstance(c, InstrumentedAttribute)]
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if only_cols:
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query = query.options(Load(root_alias).load_only(*only_cols))
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# Relationship handling per path
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# JOIN all paths we resolved and hydrate them from the join
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used_contains_eager = False
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joined_names: set[str] = set()
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for _path, relationship_attr, target_alias in join_paths:
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rel_attr = cast(InstrumentedAttribute, relationship_attr)
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name = relationship_attr.key
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if name in sql_hops:
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# Needed for WHERE/ORDER BY: join + hydrate from the join
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query = query.join(target_alias, rel_attr.of_type(target_alias), isouter=True)
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query = query.options(contains_eager(rel_attr, alias=target_alias))
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used_contains_eager = True
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joined_names.add(name)
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elif name in proj_hops:
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# Display-only: no join, bulk-load efficiently
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query = query.options(selectinload(rel_attr))
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joined_names.add(name)
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# Force-join any SQL-needed relationships that weren't in join_paths
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missing_sql = sql_hops - joined_names
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for name in missing_sql:
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rel_attr = cast(InstrumentedAttribute, getattr(root_alias, name))
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query = query.join(rel_attr, isouter=True)
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query = query.options(contains_eager(rel_attr))
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for _base_alias, rel_attr, target_alias in join_paths:
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query = query.join(target_alias, rel_attr.of_type(target_alias), isouter=True)
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query = query.options(contains_eager(rel_attr, alias=target_alias))
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used_contains_eager = True
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joined_names.add(name)
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# MSSQL requires ORDER BY when OFFSET is used (SQLA uses OFFSET for limit/offset)
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# Filters AFTER joins → no cartesian products
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if filters:
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query = query.filter(*filters)
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# MSSQL requires ORDER BY when OFFSET is used; ensure stable PK tie-breakers
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paginating = (limit is not None) or (offset is not None and offset != 0)
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if paginating and not order_by and self.backend.requires_order_by_for_offset:
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order_by = self._default_order_by(root_alias)
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if order_by:
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query = query.order_by(*order_by)
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query = query.order_by(*self._stable_order_by(root_alias, order_by))
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# Only apply offset/limit when not None and not zero
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# Offset/limit
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if offset is not None and offset != 0:
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query = query.offset(offset)
|
||||
if limit is not None and limit > 0:
|
||||
query = query.limit(limit)
|
||||
|
||||
# Projection loader options compiled from requested fields.
|
||||
# Skip if we used contains_eager to avoid loader-strategy conflicts.
|
||||
# Projection loaders only if we didn’t use contains_eager
|
||||
expanded_fields, proj_opts = compile_projection(self.model, req_fields) if req_fields else ([], [])
|
||||
if proj_opts and not used_contains_eager:
|
||||
query = query.options(*proj_opts)
|
||||
|
||||
else:
|
||||
# No params means no filters/sorts/limits; still honor projection loaders if any
|
||||
# No params; still honor projection loaders if any
|
||||
expanded_fields, proj_opts = compile_projection(self.model, req_fields) if req_fields else ([], [])
|
||||
if proj_opts:
|
||||
query = query.options(*proj_opts)
|
||||
|
||||
rows = query.all()
|
||||
|
||||
# Emit exactly what the client requested (plus id), or a reasonable fallback
|
||||
# Build projection meta for renderers
|
||||
if req_fields:
|
||||
proj = list(dict.fromkeys(req_fields)) # dedupe while preserving order
|
||||
proj = list(dict.fromkeys(req_fields))
|
||||
if "id" not in proj and hasattr(self.model, "id"):
|
||||
proj.insert(0, "id")
|
||||
else:
|
||||
|
|
@ -691,7 +603,6 @@ class CRUDService(Generic[T]):
|
|||
|
||||
return rows
|
||||
|
||||
|
||||
def create(self, data: dict, actor=None) -> T:
|
||||
session = self.session
|
||||
obj = self.model(**data)
|
||||
|
|
|
|||
|
|
@ -18,10 +18,11 @@ def init_listing_routes(app):
|
|||
abort(404)
|
||||
|
||||
# read query args
|
||||
limit = int(request.args.get("limit", 15))
|
||||
sort = request.args.get("sort") # <- capture sort from URL
|
||||
limit = request.args.get("limit", None)
|
||||
limit = int(limit) if (limit is not None and str(limit).isdigit()) else 15
|
||||
sort = request.args.get("sort")
|
||||
fields_qs = request.args.get("fields")
|
||||
cursor = request.args.get("cursor")
|
||||
# your decode returns (key, _desc, backward) in this project
|
||||
key, _desc, backward = decode_cursor(cursor)
|
||||
|
||||
# base spec per model
|
||||
|
|
@ -102,42 +103,42 @@ def init_listing_routes(app):
|
|||
{"when": {"field": "complete", "is": False}, "class": "table-danger"}
|
||||
]
|
||||
|
||||
# overlay URL-provided sort if present
|
||||
# Build params to feed CRUDService (flat dict; parse_filters expects flat keys)
|
||||
params = dict(spec)
|
||||
|
||||
# overlay fields from query (?fields=...)
|
||||
if fields_qs:
|
||||
params["fields"] = [p.strip() for p in fields_qs.split(",") if p.strip()]
|
||||
|
||||
# overlay sort from query (?sort=...)
|
||||
if sort:
|
||||
spec["sort"] = sort
|
||||
params["sort"] = sort
|
||||
|
||||
# limit semantics: 0 means "unlimited" in your service layer
|
||||
params["limit"] = limit
|
||||
|
||||
# forward *all other* query params as filters (flat), excluding known control keys
|
||||
CONTROL_KEYS = {"limit", "cursor", "sort", "fields"}
|
||||
for k, v in request.args.items():
|
||||
if k in CONTROL_KEYS:
|
||||
continue
|
||||
if v is None or v == "":
|
||||
continue
|
||||
params[k] = v
|
||||
|
||||
service = crudkit.crud.get_service(cls)
|
||||
try:
|
||||
rt = app.extensions["crudkit"]["runtime"]
|
||||
rt_engine = rt.engine
|
||||
except Exception:
|
||||
rt_engine = None
|
||||
|
||||
try:
|
||||
SessionFactory = app.extensions["crudkit"].get("SessionFactory")
|
||||
sf_engine = getattr(SessionFactory, "bind", None) or getattr(SessionFactory, "kw", {}).get("bind")
|
||||
except Exception:
|
||||
sf_engine = None
|
||||
|
||||
try:
|
||||
bind = service.session.get_bind()
|
||||
svc_engine = getattr(bind, "engine", bind)
|
||||
except Exception:
|
||||
svc_engine = None
|
||||
|
||||
# include limit and go
|
||||
window = service.seek_window(spec | {"limit": limit}, key=key, backward=backward, include_total=True)
|
||||
window = service.seek_window(params, key=key, backward=backward, include_total=True)
|
||||
|
||||
table = render_table(window.items, columns=columns,
|
||||
opts={"object_class": model, "row_classes": row_classes})
|
||||
|
||||
# pass sort through so templates can preserve it on pager links, if they care
|
||||
pagination_ctx = {
|
||||
"limit": window.limit,
|
||||
"total": window.total,
|
||||
"next_cursor": encode_cursor(window.last_key, list(window.order.desc), backward=False),
|
||||
"prev_cursor": encode_cursor(window.first_key, list(window.order.desc), backward=True),
|
||||
"sort": sort or spec.get("sort") # expose current sort to the template
|
||||
"sort": params.get("sort") # expose current sort to the template
|
||||
}
|
||||
|
||||
return render_template("listing.html", model=model, table=table, pagination=pagination_ctx)
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue