diff options
Diffstat (limited to 'activerecord/lib/active_record/connection_adapters/postgresql')
-rw-r--r-- | activerecord/lib/active_record/connection_adapters/postgresql/oid.rb | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/connection_adapters/postgresql/oid.rb b/activerecord/lib/active_record/connection_adapters/postgresql/oid.rb index b173163e41..1e89f8cfd6 100644 --- a/activerecord/lib/active_record/connection_adapters/postgresql/oid.rb +++ b/activerecord/lib/active_record/connection_adapters/postgresql/oid.rb @@ -374,6 +374,77 @@ This is not reliable and will be removed in the future. end end + # This class uses the data from PostgreSQL pg_type table to build + # the OID -> Type mapping. + # - OID is and integer representing the type. + # - Type is an OID::Type object. + # This class has side effects on the +store+ passed during initialization. + class TypeMapInitializer # :nodoc: + def initialize(store) + @store = store + end + + def run(records) + mapped, nodes = records.partition { |row| OID.registered_type? row['typname'] } + ranges, nodes = nodes.partition { |row| row['typtype'] == 'r' } + enums, nodes = nodes.partition { |row| row['typtype'] == 'e' } + domains, nodes = nodes.partition { |row| row['typtype'] == 'd' } + arrays, nodes = nodes.partition { |row| row['typinput'] == 'array_in' } + composites, nodes = nodes.partition { |row| row['typelem'] != '0' } + + mapped.each { |row| register_mapped_type(row) } + enums.each { |row| register_enum_type(row) } + domains.each { |row| register_domain_type(row) } + arrays.each { |row| register_array_type(row) } + ranges.each { |row| register_range_type(row) } + composites.each { |row| register_composite_type(row) } + end + + private + def register_mapped_type(row) + register row['oid'], OID::NAMES[row['typname']] + end + + def register_enum_type(row) + register row['oid'], OID::Enum.new + end + + def register_array_type(row) + if subtype = @store[row['typelem'].to_i] + register row['oid'], OID::Array.new(subtype) + end + end + + def register_range_type(row) + if subtype = @store[row['rngsubtype'].to_i] + register row['oid'], OID::Range.new(subtype) + end + end + + def register_domain_type(row) + if base_type = @store[row["typbasetype"].to_i] + register row['oid'], base_type + else + warn "unknown base type (OID: #{row["typbasetype"]}) for domain #{row["typname"]}." + end + end + + def register_composite_type(row) + if subtype = @store[row['typelem'].to_i] + register row['oid'], OID::Vector.new(row['typdelim'], subtype) + end + end + + def register(oid, oid_type) + oid = oid.to_i + + raise ArgumentError, "can't register nil type for OID #{oid}" if oid_type.nil? + return if @store.key?(oid) + + @store[oid] = oid_type + end + end + # When the PG adapter connects, the pg_type table is queried. The # key of this hash maps to the `typname` column from the table. # type_map is then dynamically built with oids as the key and type |