method
primary_keys
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Class: SchemaStatements
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primary_keys(table_name)
public
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# File activerecord/lib/active_record/connection_adapters/postgresql/schema_statements.rb, line 358 def primary_keys(table_name) # :nodoc: query_values(<<~SQL, "SCHEMA") SELECT a.attname FROM ( SELECT indrelid, indkey, generate_subscripts(indkey, 1) idx FROM pg_index WHERE indrelid = #{quote(quote_table_name(table_name))}::regclass AND indisprimary ) i JOIN pg_attribute a ON a.attrelid = i.indrelid AND a.attnum = i.indkey[i.idx] ORDER BY i.idx SQL end