method
unique_constraint
v8.0.0 -
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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, nulls_not_distinct: true)
See {connection.add_unique_constraint}[rdoc-ref:SchemaStatements#add_unique_constraint]