method
unique_constraint
v7.1.3.2 -
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- Class:
ActiveRecord::ConnectionAdapters::PostgreSQL::ColumnMethods::Table
unique_constraint(*args)public
Adds a unique constraint.
t.unique_constraint(:position, name: 'unique_position', deferrable: :deferred)
See {connection.add_unique_constraint}[rdoc-ref:SchemaStatements#add_unique_constraint]