method

exclusion_constraints

v7.1.3.2 - Show latest stable - 0 notes - Class: SchemaStatements

1.0.0
1.1.6
1.2.6
2.0.3
2.1.0
2.2.1
2.3.8
3.0.0
3.0.9
3.1.0
3.2.1
3.2.8
3.2.13
4.0.2
4.1.8
4.2.1
4.2.7
4.2.9
5.0.0.1
5.1.7
5.2.3
6.0.0
6.1.3.1
6.1.7.7
7.0.0
7.1.3.2 (0)
7.1.3.4 (0)
What's this?

exclusion_constraints(table_name) public

Returns an array of exclusion constraints for the given table. The exclusion constraints are represented as ExclusionConstraintDefinition objects.

Show source

# File activerecord/lib/active_record/connection_adapters/postgresql/schema_statements.rb, line 617
        def exclusion_constraints(table_name)
          scope = quoted_scope(table_name)

          exclusion_info = internal_exec_query(            SELECT conname, pg_get_constraintdef(c.oid) AS constraintdef, c.condeferrable, c.condeferred            FROM pg_constraint c            JOIN pg_class t ON c.conrelid = t.oid            JOIN pg_namespace n ON n.oid = c.connamespace            WHERE c.contype = 'x'              AND t.relname = #{scope[:name]}              AND n.nspname = #{scope[:schema]}, "SCHEMA")

          exclusion_info.map do |row|
            method_and_elements, predicate = row["constraintdef"].split(" WHERE ")
            method_and_elements_parts = method_and_elements.match(/EXCLUDE(?: USING (?<using>\S+))? \((?<expression>.+)\)/)
            predicate.remove!(/ DEFERRABLE(?: INITIALLY (?:IMMEDIATE|DEFERRED))?/) if predicate
            predicate = predicate.from(2).to(-3) if predicate # strip 2 opening and closing parentheses

            deferrable = extract_constraint_deferrable(row["condeferrable"], row["condeferred"])

            options = {
              name: row["conname"],
              using: method_and_elements_parts["using"].to_sym,
              where: predicate,
              deferrable: deferrable
            }

            ExclusionConstraintDefinition.new(table_name, method_and_elements_parts["expression"], options)
          end
        end

exclusion_constraints

Related methods