Methods

Instance Public methods

build_explain_clause(options = [])

📝 Source code 
# File activerecord/lib/active_record/connection_adapters/postgresql/database_statements.rb, line 96
        def build_explain_clause(options = [])
          return "EXPLAIN" if options.empty?

          "EXPLAIN (#{options.join(", ").upcase})"
        end
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explain(arel, binds = [], options = [])

📝 Source code 
# File activerecord/lib/active_record/connection_adapters/postgresql/database_statements.rb, line 7
        def explain(arel, binds = [], options = [])
          sql    = build_explain_clause(options) + " " + to_sql(arel, binds)
          result = internal_exec_query(sql, "EXPLAIN", binds)
          PostgreSQL::ExplainPrettyPrinter.new.pp(result)
        end
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high_precision_current_timestamp()

📝 Source code 
# File activerecord/lib/active_record/connection_adapters/postgresql/database_statements.rb, line 92
        def high_precision_current_timestamp
          HIGH_PRECISION_CURRENT_TIMESTAMP
        end
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set_constraints(deferred, *constraints)

Set when constraints will be checked for the current transaction.

Not passing any specific constraint names will set the value for all deferrable constraints.

deferred

Valid values are :deferred or :immediate.

See www.postgresql.org/docs/current/sql-set-constraints.html

📝 Source code 
# File activerecord/lib/active_record/connection_adapters/postgresql/database_statements.rb, line 110
        def set_constraints(deferred, *constraints)
          unless %i[deferred immediate].include?(deferred)
            raise ArgumentError, "deferred must be :deferred or :immediate"
          end

          constraints = if constraints.empty?
            "ALL"
          else
            constraints.map { |c| quote_table_name(c) }.join(", ")
          end
          execute("SET CONSTRAINTS #{constraints} #{deferred.to_s.upcase}")
        end
🔎 See on GitHub