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require 'active_record/connection_adapters/abstract_adapter'
module ActiveRecord
module ConnectionAdapters
class PostgreSQLAdapter < AbstractAdapter
module OID
class Type
def type; end
def type_cast_for_write(value)
value
end
end
class Identity < Type
def type_cast(value)
value
end
end
class Bytea < Type
def type_cast(value)
PGconn.unescape_bytea value
end
end
class Money < Type
def type_cast(value)
return if value.nil?
# Because money output is formatted according to the locale, there are two
# cases to consider (note the decimal separators):
# (1) $12,345,678.12
# (2) $12.345.678,12
case value
when /^-?\D+[\d,]+\.\d{2}$/ # (1)
value.gsub!(/[^-\d.]/, '')
when /^-?\D+[\d.]+,\d{2}$/ # (2)
value.gsub!(/[^-\d,]/, '').sub!(/,/, '.')
end
ConnectionAdapters::Column.value_to_decimal value
end
end
class Vector < Type
attr_reader :delim, :subtype
# +delim+ corresponds to the `typdelim` column in the pg_types
# table. +subtype+ is derived from the `typelem` column in the
# pg_types table.
def initialize(delim, subtype)
@delim = delim
@subtype = subtype
end
# FIXME: this should probably split on +delim+ and use +subtype+
# to cast the values. Unfortunately, the current Rails behavior
# is to just return the string.
def type_cast(value)
value
end
end
class Integer < Type
def type_cast(value)
return if value.nil?
value.to_i rescue value ? 1 : 0
end
end
class Boolean < Type
def type_cast(value)
return if value.nil?
ConnectionAdapters::Column.value_to_boolean value
end
end
class Timestamp < Type
def type; :timestamp; end
def type_cast(value)
return if value.nil?
# FIXME: probably we can improve this since we know it is PG
# specific
ConnectionAdapters::PostgreSQLColumn.string_to_time value
end
end
class Date < Type
def type; :datetime; end
def type_cast(value)
return if value.nil?
# FIXME: probably we can improve this since we know it is PG
# specific
ConnectionAdapters::Column.value_to_date value
end
end
class Time < Type
def type_cast(value)
return if value.nil?
# FIXME: probably we can improve this since we know it is PG
# specific
ConnectionAdapters::Column.string_to_dummy_time value
end
end
class Float < Type
def type_cast(value)
return if value.nil?
value.to_f
end
end
class Decimal < Type
def type_cast(value)
return if value.nil?
ConnectionAdapters::Column.value_to_decimal value
end
end
class Hstore < Type
def type_cast(value)
return if value.nil?
ConnectionAdapters::PostgreSQLColumn.string_to_hstore value
end
end
class TypeMap
def initialize
@mapping = {}
end
def []=(oid, type)
@mapping[oid] = type
end
def [](oid)
@mapping[oid]
end
def key?(oid)
@mapping.key? oid
end
def fetch(ftype, fmod)
# The type for the numeric depends on the width of the field,
# so we'll do something special here.
#
# When dealing with decimal columns:
#
# places after decimal = fmod - 4 & 0xffff
# places before decimal = (fmod - 4) >> 16 & 0xffff
if ftype == 1700 && (fmod - 4 & 0xffff).zero?
ftype = 23
end
@mapping.fetch(ftype) { |oid| yield oid, fmod }
end
end
TYPE_MAP = TypeMap.new # :nodoc:
# 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
# objects as values.
NAMES = Hash.new { |h,k| # :nodoc:
h[k] = OID::Identity.new
}
# Register an OID type named +name+ with a typcasting object in
# +type+. +name+ should correspond to the `typname` column in
# the `pg_type` table.
def self.register_type(name, type)
NAMES[name] = type
end
# Alias the +old+ type to the +new+ type.
def self.alias_type(new, old)
NAMES[new] = NAMES[old]
end
# Is +name+ a registered type?
def self.registered_type?(name)
NAMES.key? name
end
register_type 'int2', OID::Integer.new
alias_type 'int4', 'int2'
alias_type 'int8', 'int2'
alias_type 'oid', 'int2'
register_type 'numeric', OID::Decimal.new
register_type 'text', OID::Identity.new
alias_type 'varchar', 'text'
alias_type 'char', 'text'
alias_type 'bpchar', 'text'
alias_type 'xml', 'text'
# FIXME: why are we keeping these types as strings?
alias_type 'tsvector', 'text'
alias_type 'interval', 'text'
alias_type 'cidr', 'text'
alias_type 'inet', 'text'
alias_type 'macaddr', 'text'
alias_type 'bit', 'text'
alias_type 'varbit', 'text'
# FIXME: I don't think this is correct. We should probably be returning a parsed date,
# but the tests pass with a string returned.
register_type 'timestamptz', OID::Identity.new
register_type 'money', OID::Money.new
register_type 'bytea', OID::Bytea.new
register_type 'bool', OID::Boolean.new
register_type 'float4', OID::Float.new
alias_type 'float8', 'float4'
register_type 'timestamp', OID::Timestamp.new
register_type 'date', OID::Date.new
register_type 'time', OID::Time.new
register_type 'path', OID::Identity.new
register_type 'polygon', OID::Identity.new
register_type 'circle', OID::Identity.new
register_type 'hstore', OID::Hstore.new
end
end
end
end
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