Adding registration,

crudkit/api/flask_api.py

@@ -6,26 +6,41 @@ def generate_crud_blueprint(model, service):
     @bp.get('/')
     def list_items():
         items = service.list(request.args)
+        try:
             return jsonify([item.as_dict() for item in items])
+        except Exception as e:
+            return jsonify({"status": "error", "error": str(e)})
 
     @bp.get('/<int:id>')
     def get_item(id):
         item = service.get(id, request.args)
+        try:
             return jsonify(item.as_dict())
+        except Exception as e:
+            return jsonify({"status": "error", "error": str(e)})
 
     @bp.post('/')
     def create_item():
         obj = service.create(request.json)
+        try:
             return jsonify(obj.as_dict())
+        except Exception as e:
+            return jsonify({"status": "error", "error": str(e)})
 
     @bp.patch('/<int:id>')
     def update_item(id):
         obj = service.update(id, request.json)
+        try:
             return jsonify(obj.as_dict())
+        except Exception as e:
+            return jsonify({"status": "error", "error": str(e)})
 
     @bp.delete('/<int:id>')
     def delete_item(id):
         service.delete(id)
-        return '', 204
+        try:
+            return jsonify({"status": "success"}), 204
+        except Exception as e:
+            return jsonify({"status": "error", "error": str(e)})
 
     return bp

crudkit/core/service.py

@@ -1,12 +1,34 @@
-from typing import Type, TypeVar, Generic, Optional
+from typing import Any, Type, TypeVar, Generic, Optional, Protocol, runtime_checkable, cast
-from sqlalchemy.orm import Load, Session, raiseload, with_polymorphic
+from sqlalchemy.orm import Load, Session, raiseload, with_polymorphic, Mapper
 from sqlalchemy.orm.attributes import InstrumentedAttribute
+from sqlalchemy.orm.util import AliasedClass
+from sqlalchemy.engine import Engine, Connection
 from sqlalchemy import inspect, text
 from crudkit.core.base import Version
 from crudkit.core.spec import CRUDSpec
 from crudkit.backend import BackendInfo, make_backend_info
 
-T = TypeVar("T")
+@runtime_checkable
+class _HasID(Protocol):
+    id: int
+
+@runtime_checkable
+class _HasTable(Protocol):
+    __table__: Any
+
+@runtime_checkable
+class _HasADict(Protocol):
+    def as_dict(self) -> dict: ...
+
+@runtime_checkable
+class _SoftDeletable(Protocol):
+    is_deleted: bool
+
+class _CRUDModelProto(_HasID, _HasTable, _HasADict, Protocol):
+    """Minimal surface that our CRUD service relies on. Soft-delete is optional."""
+    pass
+
+T = TypeVar("T", bound=_CRUDModelProto)
 
 def _is_truthy(val):
     return str(val).lower() in ('1', 'true', 'yes', 'on')
@@ -25,7 +47,9 @@ class CRUDService(Generic[T]):
         self.polymorphic = polymorphic
         self.supports_soft_delete = hasattr(model, 'is_deleted')
         # Cache backend info once. If not provided, derive from session bind.
-        self.backend = backend or make_backend_info(self.session.get_bind())
+        bind = self.session.get_bind()
+        eng: Engine = bind.engine if isinstance(bind, Connection) else cast(Engine, bind)
+        self.backend = backend or make_backend_info(eng)
 
     def get_query(self):
         if self.polymorphic:
@@ -35,7 +59,7 @@ class CRUDService(Generic[T]):
 
     # Helper: default ORDER BY for MSSQL when paginating without explicit order
     def _default_order_by(self, root_alias):
-        mapper = inspect(self.model)
+        mapper: Mapper[Any] = cast(Mapper[Any], inspect(self.model))
         cols = []
         for col in mapper.primary_key:
             try:
@@ -64,11 +88,9 @@ class CRUDService(Generic[T]):
         spec.parse_includes()
 
         for parent_alias, relationship_attr, target_alias in spec.get_join_paths():
-            query = query.join(
+            rel_attr = cast(InstrumentedAttribute, relationship_attr)
-                target_alias,
+            target = cast(Any, target_alias)
-                relationship_attr.of_type(target_alias),
+            query = query.join(target, rel_attr.of_type(target), isouter=True)
-                isouter=True
-            )
 
         if params:
             root_fields, rel_field_names, root_field_names = spec.parse_fields()
@@ -123,11 +145,9 @@ class CRUDService(Generic[T]):
             spec.parse_includes()
 
             for parent_alias, relationship_attr, target_alias in spec.get_join_paths():
-                query = query.join(
+                rel_attr = cast(InstrumentedAttribute, relationship_attr)
-                    target_alias,
+                target = cast(Any, target_alias)
-                    relationship_attr.of_type(target_alias),
+                query = query.join(target, rel_attr.of_type(target), isouter=True)
-                    isouter=True
-                )
 
             if params:
                 root_fields, rel_field_names, root_field_names = spec.parse_fields()
@@ -206,7 +226,8 @@ class CRUDService(Generic[T]):
         if hard or not self.supports_soft_delete:
             self.session.delete(obj)
         else:
-            obj.is_deleted = True
+            soft = cast(_SoftDeletable, obj)
+            soft.is_deleted = True
         self.session.commit()
         self._log_version("delete", obj, actor)
         return obj

crudkit/integration.py

@@ -0,0 +1,25 @@
+from __future__ import annotations
+from typing import Type
+from flask import Flask
+
+from crudkit.engines import CRUDKitRuntime
+
+from .registry import CRUDRegistry
+
+class CRUDKit:
+    def __init__(self, app: Flask, runtime: CRUDKitRuntime):
+        self.app = app
+        self.runtime = runtime
+        self.registry = CRUDRegistry(runtime)
+
+    def register(self, model: Type, **kwargs):
+        return self.registry.register_class(self.app, model, **kwargs)
+
+    def register_many(self, models: list[Type], **kwargs):
+        return self.registry.register_many(self.app, models, **kwargs)
+
+    def get_model(self, key: str):
+        return self.registry.get_model(key)
+
+    def get_service(self, model: Type):
+        return self.registry.get_service(model)

crudkit/registry.py

@@ -0,0 +1,120 @@
+from __future__ import annotations
+
+from dataclasses import dataclass
+from typing import Any, Dict, Optional, Type, TypeVar, cast
+
+from flask import Flask
+from sqlalchemy.orm import Session
+
+from crudkit.core.service import CRUDService
+from crudkit.api.flask_api import generate_crud_blueprint
+from crudkit.engines import CRUDKitRuntime
+
+T = TypeVar("T")
+
+@dataclass
+class Registered:
+    model: Type[Any]
+    service: CRUDService[Any]
+    blueprint_name: str
+    url_prefix: str
+
+class CRUDRegistry:
+    """
+    Binds:
+        - name -> model class
+        - model class -> CRUDService (using CRUDKitRuntime.session_factory)
+        - model class -> Flask blueprint (via generate_crud_blueprint)
+    """
+    def __init__(self, runtime: CRUDKitRuntime):
+        self._rt = runtime
+        self._models_by_key: Dict[str, Type[Any]] = {}
+        self._services_by_model: Dict[Type[Any], CRUDService[Any]] = {}
+        self._bps_by_model: Dict[Type[Any], Registered] = {}
+
+    @staticmethod
+    def _key(model_or_name: Type[Any] | str) -> str:
+        return model_or_name.lower() if isinstance(model_or_name, str) else model_or_name.__name__.lower()
+
+    def get_model(self, key: str) -> Optional[Type[Any]]:
+        return self._models_by_key.get(key.lower())
+
+    def get_service(self, model: Type[T]) -> Optional[CRUDService[T]]:
+        return cast(Optional[CRUDService[T]], self._services_by_model.get(model))
+
+    def is_registered(self, model: Type[Any]) -> bool:
+        return model in self._services_by_model
+
+    def register_class(
+        self,
+        app: Flask,
+        model: Type[Any],
+        *,
+        url_prefix: Optional[str] = None,
+        blueprint_name: Optional[str] = None,
+        polymorphic: bool = False,
+        service_kwargs: Optional[dict] = None
+    ) -> Registered:
+        """
+        Register a model:
+            - store name -> class
+            - create a CRUDService bound to a Session from runtime.session_factory
+            - attach backend into from runtime.backend
+            - mount Flask blueprint at /api/<modelname> by default
+        Idempotent for each model.
+        """
+        key = self._key(model)
+        self._models_by_key.setdefault(key, model)
+
+        svc = self._services_by_model.get(model)
+        if svc is None:
+            SessionMaker = self._rt.session_factory
+            if SessionMaker is None:
+                raise RuntimeError("CRUDKitRuntime.session_factory is not initialized.")
+            session: Session = SessionMaker()
+            svc = CRUDService(
+                model,
+                session=session,
+                polymorphic=polymorphic,
+                backend=self._rt.backend,
+                **(service_kwargs or {}),
+            )
+            self._services_by_model[model] = svc
+
+        reg = self._bps_by_model.get(model)
+        if reg:
+            return reg
+
+        prefix = url_prefix or f"/api/{key}"
+        bp_name = blueprint_name or f"crudkit.{key}"
+
+        bp = generate_crud_blueprint(model, svc)
+        bp.name = bp_name
+        app.register_blueprint(bp, url_prefix=prefix)
+
+        reg = Registered(model=model, service=svc, blueprint_name=bp_name, url_prefix=prefix)
+        self._bps_by_model[model] = reg
+        return reg
+
+    def register_many(
+        self,
+        app: Flask,
+        models: list[Type[Any]],
+        *,
+        base_prefix: str = "/api",
+        polymorphic: bool = False,
+        service_kwargs: Optional[dict] = None,
+    ) -> list[Registered]:
+        out: list[Registered] = []
+        for m in models:
+            key = self._key(m)
+            out.append(
+                self.register_class(
+                    app,
+                    m,
+                    url_prefix=f"{base_prefix}/{key}",
+                    polymorphic=polymorphic,
+                    service_kwargs=service_kwargs,
+                )
+            )
+        return out

crudkit/ui/fragments.py

@@ -85,7 +85,7 @@ def _build_href(spec: Dict[str, Any], row: Dict[str, Any], obj) -> Optional[str]
         print(f"[render_table] url_for failed: endpoint={spec}: params={params}")
         return None
     try:
-        return url_for(spec["endpoint"], **params)
+        return url_for('crudkit.' + spec["endpoint"], **params)
     except Exception as e:
         print(f"[render_table] url_for failed: endpoint={spec['endpoint']} params={params} err={e}")
         return None