add_reference(table_name, ref_name, options = {})
Instance Public methods
Adds a reference. Optionally adds a type column, if
:polymorphic option is provided. add_reference
and add_belongs_to are acceptable.
Create a user_id column
add_reference(:products, :user)
Create a supplier_id and supplier_type columns
add_belongs_to(:products, :supplier, polymorphic: true)
Create a supplier_id, supplier_type columns and appropriate index
add_reference(:products, :supplier, polymorphic: true, index: true)
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