feat(model): add polymorphic association support#2104
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Adds Rails-style polymorphic associations to the Wheels ORM: - belongsTo(name="commentable", polymorphic=true) for the child side - hasMany(name="comments", as="commentable") for the parent side - hasOne(name="comment", as="commentable") for singular parent side Polymorphic belongsTo resolves the target model dynamically from the type column at runtime. Eager loading via include= throws a clear error since the target model varies per row. hasMany/hasOne with as= adds a type discriminator to both JOIN ON clauses and dynamic method WHERE clauses, and auto-sets the type column on new/create operations. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Summary
belongsTo(polymorphic=true),hasMany(as=...),hasOne(as=...))belongsToresolves target model dynamically from the type column; eager loading viainclude=throwsWheels.PolymorphicIncludeNotSupportedhasMany/hasOnewithasadds type discriminator to JOIN ON clauses and dynamic method WHERE clauses, and auto-sets the type column onnew/createoperationsTest plan
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