instance method `primary_key`

Ruby on Rails 6.1.7.10

Since v5.2.8.1

Available in: v5.2.8.1 v6.0.6 v6.1.7.10 v7.0.10 v7.1.6 v7.2.3 v8.0.4 v8.1.2

Compare with:

primary_key(table_name)

Returns just a table’s primary key

Parameters

table_name req

Source

# File activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb, line 148
      def primary_key(table_name)
        pk = primary_keys(table_name)
        pk = pk.first unless pk.size > 1
        pk
      end

Defined in activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb line 148 · View on GitHub · Improve this page · Find usages on GitHub

Defined in ActiveRecord::ConnectionAdapters::SchemaStatements

Signature

Parameters