graph LR
orm_models_Model["orm.models.Model"]
orm_fields_Field["orm.fields.Field"]
orm_models_metadata["orm.models.metadata"]
orm_models_table["orm.models.table"]
orm_models_build_table["orm.models.build_table"]
orm_models_Model -- "aggregates" --> orm_fields_Field
orm_models_Model -- "registers schema with" --> orm_models_metadata
orm_models_Model -- "uses" --> orm_models_table
orm_models_Model -- "calls" --> orm_models_build_table
orm_fields_Field -- "contributes to" --> orm_models_table
orm_models_table -- "is registered with" --> orm_models_metadata
orm_models_build_table -- "constructs" --> orm_models_table
The Model Definition Layer is responsible for translating Python class definitions into database table schemas. It allows users to define ORM models using orm.models.Model and orm.fields.Field, which are then translated into SQLAlchemy Table objects and registered with a central MetaData registry for database operations.
The foundational abstract base class for all user-defined ORM models. It provides the declarative mechanism for defining table names, primary keys, and orchestrates the mapping of Python attributes to database columns. It serves as the entry point for defining the structure of database tables as Python objects.
Related Classes/Methods:
Represents individual columns within a model. This component defines the data type, constraints (e.g., nullability, uniqueness), default values, and validation logic for each attribute, acting as the bridge between Python data types and database column types.
Related Classes/Methods:
A central registry (typically an instance of SQLAlchemy's MetaData) that collects and manages all declared table schemas. It acts as the authoritative source for schema information, crucial for DDL operations like create_all and drop_all.
Related Classes/Methods:
Refers to the SQLAlchemy Table object, which is the direct, low-level representation of a database table. This component is derived from the Model and Field definitions and is used by the ORM's query interface to construct SQL statements.
Related Classes/Methods:
A utility or internal method responsible for dynamically constructing the SQLAlchemy Table object based on the Model's defined fields and metadata. This is a key internal mechanism for translating the Python model definition into a database-mappable structure.
Related Classes/Methods: