Django Chain Models

django_chain.mixins

Mixins for reusable view logic in django-chain.

This module provides mixins for JSON response handling, model CRUD operations, and activation/deactivation patterns to be used in Django class-based views throughout django-chain.

Typical usage example

class MyView(JSONResponseMixin, ModelListMixin, View): ...

LLMGenerationMixin

Mixin for LLM model and workflow instantiation in views.

Provides methods to get a model, invoke a runnable, and dispatch requests for LLM generation.

get_model(**kwargs)

Get a workflow chain for LLM generation.

Parameters:

• **kwargs –

  Arguments for prompt, model, and workflow selection.

Returns:

• Any ( Any ) –

  The workflow chain instance.

invoke_runnable(request, *args, **kwargs)

Invoke a runnable with user input.

Parameters:

• request (HttpRequest) –

  The HTTP request object.

• *args –

  Additional arguments.

• **kwargs –

  Must include 'runnable' and 'input'.

Returns:

• Any ( Any ) –

  The output from the runnable.

dispatch(request, *args, **kwargs)

Custom dispatch to handle LLM invocation for POST requests.

Parameters:

• request (HttpRequest) –

  The HTTP request object.

• *args –

  Additional arguments.

• **kwargs –

  Additional keyword arguments.

Returns:

• HttpResponse –

  The response from the view.

JSONResponseMixin

Mixin to render a response as JSON. Handles serialization of data and consistent error responses.

render_json_response(data=None, status=200, safe=True)

Renders data as a JSON response. safe=False is needed if the top-level object is a list.

Parameters:

• data (dict, default: None ) –

  Data to serialize. Defaults to None.

• status (int, default: 200 ) –

  HTTP status code. Defaults to 200.

• safe (bool, default: True ) –

  Whether to allow non-dict top-level objects. Defaults to True.

Returns:

• JsonResponse ( JsonResponse ) –

  The JSON response.

json_error_response(error_message, status=400)

Returns a consistent JSON error response.

Parameters:

• error_message (str | dict) –

  The error message or dict of errors.

• status (int, default: 400 ) –

  HTTP status code. Defaults to 400.

Returns:

• JsonResponse ( JsonResponse ) –

  The JSON error response.

dispatch(request, *args, **kwargs)

Apply csrf_exempt to all methods in views inheriting this mixin. Also attempts to load JSON body for POST/PUT methods.

Parameters:

• request (HttpRequest) –

  The HTTP request object.

• *args –

  Additional arguments.

• **kwargs –

  Additional keyword arguments.

Returns:

• HttpResponse –

  The response from the view.

ModelRetrieveMixin

Mixin for retrieving a single model instance by its primary key (pk). Requires: model_class, serializer_method.

get_object(pk)

Retrieve a model instance by primary key.

Parameters:

• pk (Any) –

  The primary key value.

Returns:

• Any ( Any ) –

  The model instance or None if not found.

ModelListMixin

Mixin for listing model instances with optional filtering. Requires: model_class, serializer_method.

get_queryset(request)

Get a queryset of all model instances.

Parameters:

• request (HttpRequest) –

  The HTTP request object.

Returns:

• QuerySet ( Any ) –

  The queryset of model instances.

apply_list_filters(queryset, request)

Apply filters to the queryset. Override in subclasses.

Parameters:

• queryset (QuerySet) –

  The queryset to filter.

• request (HttpRequest) –

  The HTTP request object.

Returns:

• QuerySet ( Any ) –

  The filtered queryset.

ModelCreateMixin

Mixin for handling POST requests to create new model instances. Requires: model_class, serializer_method.

create_object(request_data)

Create a new model instance from request data.

Parameters:

• request_data (dict) –

  Data for the new instance.

Returns:

• Any ( Any ) –

  The created model instance.

ModelUpdateMixin

Mixin for handling PUT requests to update existing model instances. Requires: model_class, serializer_method.

update_object(obj, request_data)

Update an existing model instance with request data.

Parameters:

• obj (Any) –

  The model instance to update.

• request_data (dict) –

  Data to update the instance with.

Returns:

• Any ( Any ) –

  The updated model instance.

ModelDeleteMixin

Mixin for handling DELETE requests to delete model instances.

delete_object(obj)

Delete a model instance.

Parameters:

• obj (Any) –

  The model instance to delete.

ModelActivateDeactivateMixin

Mixin for handling activation/deactivation of models with an 'is_active' field. Requires: model_class, serializer_method.

post(request, pk, action)

Activate or deactivate a model instance.

Parameters:

• request (HttpRequest) –

  The HTTP request object.

• pk (Any) –

  The primary key of the instance.

• action (str) –

  'activate' or 'deactivate'.

Returns:

• JsonResponse ( Any ) –

  The response with the updated instance or error.