/usr/lib/ruby/vendor_ruby/sequel/extensions/pg_json.rb is in ruby-sequel 3.36.1-1.
This file is owned by root:root, with mode 0o644.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 | # The pg_json extension adds support for Sequel to handle
# PostgreSQL's json type. It is slightly more strict than the
# PostgreSQL json type in that the object returned must be an
# array or object (PostgreSQL's json type considers plain numbers
# and strings as valid). This is because Sequel relies completely
# on the ruby JSON library for parsing, and ruby's JSON library
# does not accept the values.
#
# This extension integrates with Sequel's native postgres adapter, so
# that when json fields are retrieved, they are parsed and returned
# as instances of Sequel::Postgres::JSONArray or
# Sequel::Postgres::JSONHash. JSONArray and JSONHash are
# DelegateClasses of Array and Hash, so they mostly act the same, but
# not completely (json_array.is_a?(Array) is false). If you want
# the actual array for a JSONArray, call JSONArray#to_a. If you want
# the actual hash for a JSONHash, call JSONHash#to_hash.
# This is done so that Sequel does not treat JSONArray and JSONHash
# like Array and Hash by default, which would cause issues.
#
# To turn an existing Array or Hash into a JSONArray or JSONHash:
#
# array.pg_json
# hash.pg_json
#
# So if you want to insert an array or hash into an json database column:
#
# DB[:table].insert(:column=>[1, 2, 3].pg_json)
# DB[:table].insert(:column=>{'a'=>1, 'b'=>2}.pg_json)
#
# If you would like to use PostgreSQL json columns in your model
# objects, you probably want to modify the schema parsing/typecasting
# so that it recognizes and correctly handles the json type, which
# you can do by:
#
# DB.extend Sequel::Postgres::JSONDatabaseMethods
#
# If you are not using the native postgres adapter, you probably
# also want to use the typecast_on_load plugin in the model, and
# set it to typecast the json column(s) on load.
#
# The extension is designed to be used with the json type natively
# supported by PostgreSQL 9.2+. There was also a PostgreSQL extension released
# that allowed the json type to be used on PostgreSQL 9.1. To make
# this extension support that type in the native adapter, do the
# following after loading this extension:
#
# Sequel::Postgres::PG_NAMED_TYPES = {} unless defined?(Sequel::Postgres::PG_NAMED_TYPES)
# Sequel::Postgres::PG_NAMED_TYPES[:json] = Sequel::Postgres::PG_TYPES[114]
#
# This extension requires both the json and delegate libraries.
require 'delegate'
require 'json'
module Sequel
module Postgres
CAST_JSON = '::json'.freeze
# Class representating PostgreSQL JSON column array values.
class JSONArray < DelegateClass(Array)
# Convert the array to a string using to_json, append a
# literalized version of the string to the sql, and explicitly
# cast the string to json.
def sql_literal_append(ds, sql)
ds.literal_append(sql, to_json)
sql << CAST_JSON
end
end
# Class representating PostgreSQL JSON column hash/object values.
class JSONHash < DelegateClass(Hash)
# Convert the array to a string using to_json, append a
# literalized version of the string to the sql, and explicitly
# cast the string to json.
def sql_literal_append(ds, sql)
ds.literal_append(sql, to_json)
sql << CAST_JSON
end
# Return the object being delegated to.
alias to_hash __getobj__
end
# Methods enabling Database object integration with the json type.
module JSONDatabaseMethods
# Parse the given string as json, returning either a JSONArray
# or JSONHash instance, and raising an error if the JSON
# parsing does not yield an array or hash.
def self.parse_json(s)
begin
value = JSON.parse(s)
rescue JSON::ParserError=>e
raise Sequel.convert_exception_class(e, Sequel::InvalidValue)
end
case value
when Array
JSONArray.new(value)
when Hash
JSONHash.new(value)
else
raise Sequel::InvalidValue, "unhandled json value: #{value.inspect} (from #{s.inspect})"
end
end
# Reset the conversion procs when extending the Database object, so
# it will pick up the json convertor. This is only done for the native
# postgres adapter.
def self.extended(db)
db.reset_conversion_procs if db.respond_to?(:reset_conversion_procs)
end
# Handle JSONArray and JSONHash in bound variables
def bound_variable_arg(arg, conn)
case arg
when JSONArray, JSONHash
arg.to_json
else
super
end
end
# Make the column type detection recognize the json type.
def schema_column_type(db_type)
case db_type
when 'json'
:json
else
super
end
end
private
# Given a value to typecast to the json column
# * If given a JSONArray or JSONHash, just return the value
# * If given an Array, return a JSONArray
# * If given a Hash, return a JSONHash
# * If given a String, parse it as would be done during
# database retrieval.
def typecast_value_json(value)
case value
when JSONArray, JSONHash
value
when Array
JSONArray.new(value)
when Hash
JSONHash.new(value)
when String
JSONDatabaseMethods.parse_json(value)
else
raise Sequel::InvalidValue, "invalid value for json: #{value.inspect}"
end
end
end
PG_TYPES = {} unless defined?(PG_TYPES)
PG_TYPES[114] = JSONDatabaseMethods.method(:parse_json)
end
end
class Array
# Return a Sequel::Postgres::JSONArray proxy to the receiver.
# This is mostly useful as a short cut for creating JSONArray
# objects that didn't come from the database.
def pg_json
Sequel::Postgres::JSONArray.new(self)
end
end
class Hash
# Return a Sequel::Postgres::JSONHash proxy to the receiver.
# This is mostly useful as a short cut for creating JSONHash
# objects that didn't come from the database.
def pg_json
Sequel::Postgres::JSONHash.new(self)
end
end
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