addDimensionForeignKey

lsst.daf.butler.addDimensionForeignKey(tableSpec: ddl.TableSpec, dimension: Dimension, *, primaryKey: bool, nullable: bool = False) → ddl.FieldSpec

Add a field and possibly a foreign key to a table specification that reference the table for the given Dimension.

Parameters:

tableSpec : ddl.TableSpec

Specification the field and foreign key are to be added to.

dimension : Dimension

Dimension to be referenced. If this dimension has required dependencies, those must have already been added to the table. A field will be added that correspond to this dimension’s primary key, and a foreign key constraint will be added only if the dimension is associated with a table of its own.

primaryKey : bool

If True, the new field will be added as part of a compound primary key for the table.

nullable : bool, optional

If False (default) the new field will be added with a NOT NULL constraint.

Returns:

fieldSpec : ddl.FieldSpec

Specification for the field just added.