activerecord/lib/active_record/connection_adapters/postgresql/utils.rb


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module ActiveRecord
  module ConnectionAdapters
    module PostgreSQL
      module Utils # :nodoc:
        extend self

        # Returns an array of <tt>[schema_name, table_name]</tt> extracted from +name+.
        # +schema_name+ is nil if not specified in +name+.
        # +schema_name+ and +table_name+ exclude surrounding quotes (regardless of whether provided in +name+)
        # +name+ supports the range of schema/table references understood by PostgreSQL, for example:
        #
        # * <tt>table_name</tt>
        # * <tt>"table.name"</tt>
        # * <tt>schema_name.table_name</tt>
        # * <tt>schema_name."table.name"</tt>
        # * <tt>"schema_name".table_name</tt>
        # * <tt>"schema.name"."table name"</tt>
        def extract_schema_and_table(name)
          table, schema = name.scan(/[^".\s]+|"[^"]*"/)[0..1].collect{|m| m.gsub(/(^"|"$)/,'') }.reverse
          [schema, table]
        end
      end
    end
  end
end