handle complex foreign key associations #15
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A table may have multiple foreign keys with cascaded deletes. The original logic would create a Compositions for each foreign key association, resulting in a single table being part of multipe Compositions, which is not permissable. Instead, if this condition applies, turn the associations into Associations.
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The previous commit didn't properly handle the case where a table had multiple foreign key associations (with and without cascades) to one or more tables. The new logic implements the following rules: * a table which has fk cascades to more than one table must be an Association * a table which has multiple fk cascades to a single table (even if it has fk non-cascades) is a Composition. * a table with multiple fk cascades to a single ref table combines those cascades into a single Composition * a table with fk cascades and non-cascades to a single ref table splits the cascades into a Composition and the non-cascades to an Association Associations and Compositions are merged if possible.
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Properly handle complex foreign key associations.
The new logic implements the following rules:
Association
has fk non-cascades) is a Composition.
those cascades into a single Composition
splits the cascades into a Composition and the non-cascades to an
Association