# CollectionsMixin **`class CollectionsMixin`** Bases: [`object`](https://docs.python.org/3.11/library/functions.html#object) Mixin for collection related API calls. Collection is a list of items that can be used to filter the search results. Methods SummaryMethods Documentation **`add_item_to_collection(project_id, collection_id, item_id)`** Add an item to a collection. The item_id validity is not checked. If successful, returns an empty dictionary. Return type [`dict`](https://docs.python.org/3.11/library/stdtypes.html#dict)[[`Any`](https://docs.python.org/3.11/library/typing.html#typing.Any), [`Any`](https://docs.python.org/3.11/library/typing.html#typing.Any)] **`create_collection(project_id, name, filter_query=None)`** Create a new collection for a project. **`delete_collection(project_id, collection_id)`** Delete a collection by ID. If successful, returns an empty dictionary. Return type [`dict`](https://docs.python.org/3.11/library/stdtypes.html#dict)[[`Any`](https://docs.python.org/3.11/library/typing.html#typing.Any), [`Any`](https://docs.python.org/3.11/library/typing.html#typing.Any)] **`delete_item_from_collection(project_id, collection_id, item_id)`** Delete an item from a collection. If successful, returns an empty dictionary. Return type [`dict`](https://docs.python.org/3.11/library/stdtypes.html#dict)[[`Any`](https://docs.python.org/3.11/library/typing.html#typing.Any), [`Any`](https://docs.python.org/3.11/library/typing.html#typing.Any)] **`get_collection(project_id, collection_id)`** Get a collection by ID. **`get_collections(project_id)`** Get item collections for a project. **`get_collections_containing_items(project_id, item_ids)`** Get collections that contain the given items. Returns a dictionary with item IDs as keys and list of collection IDs as values. **`update_collection(project_id, collection_id, name, filter_query=None)`** Update a collection by ID. Parameters - `project_id` ([`str`](https://docs.python.org/3.11/library/stdtypes.html#str)) – The project ID - `collection_id` ([`str`](https://docs.python.org/3.11/library/stdtypes.html#str)) – The collection ID - `name` ([`str`](https://docs.python.org/3.11/library/stdtypes.html#str)) – New name for the collection - `filter_query` ([`Optional`](https://docs.python.org/3.11/library/typing.html#typing.Optional)[[`str`](https://docs.python.org/3.11/library/stdtypes.html#str)]) – New filter query (can be None to clear)