> ## Documentation Index > Fetch the complete documentation index at: https://docs.prefect.io/llms.txt > Use this file to discover all available pages before exploring further. # block_types # `prefect.server.models.block_types` Functions for interacting with block type ORM objects. Intended for internal use by the Prefect REST API. ## Functions ### `emit_block_type_created_event` ```python theme={null} emit_block_type_created_event(block_type: BlockType) -> None ``` Emit an event when a block type is created. ### `emit_block_type_updated_event` ```python theme={null} emit_block_type_updated_event(block_type: BlockType) -> None ``` Emit an event when a block type is updated. ### `emit_block_type_deleted_event` ```python theme={null} emit_block_type_deleted_event(block_type: BlockType) -> None ``` Emit an event when a block type is deleted. ### `create_block_type` ```python theme={null} create_block_type(db: PrefectDBInterface, session: AsyncSession, block_type: Union[schemas.core.BlockType, 'ClientBlockType'], override: bool = False) -> Union[BlockType, None] ``` Create a new block type. **Args:** * `session`: A database session * `block_type`: a block type object **Returns:** * an ORM block type model ### `read_block_type` ```python theme={null} read_block_type(db: PrefectDBInterface, session: AsyncSession, block_type_id: UUID) -> Union[BlockType, None] ``` Reads a block type by id. **Args:** * `session`: A database session * `block_type_id`: a block\_type id **Returns:** * an ORM block type model ### `read_block_type_by_slug` ```python theme={null} read_block_type_by_slug(db: PrefectDBInterface, session: AsyncSession, block_type_slug: str) -> Union[BlockType, None] ``` Reads a block type by slug. **Args:** * `session`: A database session * `block_type_slug`: a block type slug **Returns:** * an ORM block type model ### `read_block_types` ```python theme={null} read_block_types(db: PrefectDBInterface, session: AsyncSession, block_type_filter: Optional[schemas.filters.BlockTypeFilter] = None, block_schema_filter: Optional[schemas.filters.BlockSchemaFilter] = None, limit: Optional[int] = None, offset: Optional[int] = None) -> Sequence[BlockType] ``` Reads block types with an optional limit and offset Args: **Returns:** * List\[BlockType]: List of ### `update_block_type` ```python theme={null} update_block_type(db: PrefectDBInterface, session: AsyncSession, block_type_id: Union[str, UUID], block_type: Union[schemas.actions.BlockTypeUpdate, schemas.core.BlockType, 'ClientBlockTypeUpdate', 'ClientBlockType']) -> bool ``` Update a block type by id. **Args:** * `session`: A database session * `block_type_id`: Data to update block type with * `block_type`: A block type id **Returns:** * True if the block type was updated ### `delete_block_type` ```python theme={null} delete_block_type(db: PrefectDBInterface, session: AsyncSession, block_type_id: UUID) -> bool ``` Delete a block type by id. **Args:** * `session`: A database session * `block_type_id`: A block type id **Returns:** * True if the block type was updated