discourse/app/models/concerns/has_custom_fields.rb

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# frozen_string_literal: true
module HasCustomFields
extend ActiveSupport::Concern
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module Helpers
def self.append_field(target, key, value, types)
if target.has_key?(key)
target[key] = [target[key]] if !target[key].is_a? Array
target[key] << cast_custom_field(key, value, types, _return_array = false)
else
target[key] = cast_custom_field(key, value, types)
end
end
CUSTOM_FIELD_TRUE ||= %w[1 t true T True TRUE].freeze
def self.get_custom_field_type(types, key)
return unless types
sorted_types = types.keys.select { |k| k.end_with?("*") }.sort_by(&:length).reverse
sorted_types.each { |t| return types[t] if key =~ /\A#{t}/i }
types[key]
end
def self.cast_custom_field(key, value, types, return_array = true)
return value unless type = get_custom_field_type(types, key)
array = nil
if Array === type
type = type[0]
array = true if return_array
end
result =
case type
when :boolean
!!CUSTOM_FIELD_TRUE.include?(value)
when :integer
value.to_i
when :json
parse_json_value(value, key)
else
value
end
array ? [result] : result
end
def self.parse_json_value(value, key)
::JSON.parse(value)
rescue JSON::ParserError
Rails.logger.warn(
"Value '#{value}' for custom field '#{key}' is not json, it is being ignored.",
)
{}
end
end
included do
has_many :_custom_fields, dependent: :destroy, class_name: "#{name}CustomField"
after_save :save_custom_fields
attr_reader :preloaded_custom_fields
def custom_fields_fk
@custom_fields_fk ||= "#{_custom_fields.reflect_on_all_associations(:belongs_to)[0].name}_id"
end
# To avoid n+1 queries, use this function to retrieve lots of custom fields in one go
# and create a "sideloaded" version for easy querying by id.
def self.custom_fields_for_ids(ids, allowed_fields)
klass = "#{name}CustomField".constantize
foreign_key = "#{name.underscore}_id".to_sym
result = {}
return result if allowed_fields.blank?
klass
.where(foreign_key => ids, :name => allowed_fields)
.pluck(foreign_key, :name, :value)
.each do |cf|
result[cf[0]] ||= {}
append_custom_field(result[cf[0]], cf[1], cf[2])
end
result
end
def self.append_custom_field(target, key, value)
HasCustomFields::Helpers.append_field(target, key, value, @custom_field_types)
end
def self.register_custom_field_type(name, type)
@custom_field_types ||= {}
@custom_field_types[name] = type
end
def self.get_custom_field_type(name)
@custom_field_types ||= {}
@custom_field_types[name]
end
def self.preload_custom_fields(objects, fields)
if objects.present?
map = {}
empty = {}
fields.each { |field| empty[field] = nil }
objects.each do |obj|
map[obj.id] = obj
obj.set_preloaded_custom_fields(empty.dup)
end
fk = (name.underscore << "_id")
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"#{name}CustomField"
.constantize
.where("#{fk} in (?)", map.keys)
.where("name in (?)", fields)
.pluck(fk, :name, :value)
.each do |id, name, value|
preloaded = map[id].preloaded_custom_fields
preloaded.delete(name) if preloaded[name].nil?
HasCustomFields::Helpers.append_field(preloaded, name, value, @custom_field_types)
end
end
end
end
def reload(options = nil)
clear_custom_fields
super
end
def on_custom_fields_change
# Callback when custom fields have changed
# Override in model
end
def custom_fields_preloaded?
!!@preloaded_custom_fields
end
def custom_field_preloaded?(name)
@preloaded_custom_fields && @preloaded_custom_fields.key?(name)
end
def clear_custom_fields
@custom_fields = nil
@custom_fields_orig = nil
end
class NotPreloadedError < StandardError
end
class PreloadedProxy
def initialize(preloaded, klass_with_custom_fields)
@preloaded = preloaded
@klass_with_custom_fields = klass_with_custom_fields
end
def [](key)
if @preloaded.key?(key)
@preloaded[key]
else
# for now you can not mix preload an non preload, it better just to fail
raise NotPreloadedError,
"Attempted to access the non preloaded custom field '#{key}' on the '#{@klass_with_custom_fields}' class. This is disallowed to prevent N+1 queries."
end
end
end
def set_preloaded_custom_fields(custom_fields)
@preloaded_custom_fields = custom_fields
# we have to clear this otherwise the fields are cached inside the
# already existing proxy and no new ones are added, so when we check
# for custom_fields[KEY] an error is likely to occur
@preloaded_proxy = nil
end
def custom_fields
if @preloaded_custom_fields
return @preloaded_proxy ||= PreloadedProxy.new(@preloaded_custom_fields, self.class.to_s)
end
@custom_fields ||= refresh_custom_fields_from_db.dup
end
def custom_fields=(data)
custom_fields.replace(data)
end
def custom_fields_clean?
# Check whether the cached version has been changed on this model
!@custom_fields || @custom_fields_orig == @custom_fields
end
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# `upsert_custom_fields` will only insert/update existing fields, and will not
# delete anything. It is safer under concurrency and is recommended when
# you just want to attach fields to things without maintaining a specific
# set of fields.
def upsert_custom_fields(fields)
fields.each do |k, v|
row_count = _custom_fields.where(name: k).update_all(value: v)
_custom_fields.create!(name: k, value: v) if row_count == 0
custom_fields[k.to_s] = v # We normalize custom_fields as strings
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end
on_custom_fields_change
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end
def save_custom_fields(force = false)
if force || !custom_fields_clean?
dup = @custom_fields.dup.with_indifferent_access
array_fields = {}
ActiveRecord::Base.transaction do
_custom_fields.reload.each do |f|
if dup[f.name].is_a?(Array)
# we need to collect Arrays fully before we can compare them
if !array_fields.has_key?(f.name)
array_fields[f.name] = [f]
else
array_fields[f.name] << f
end
elsif dup[f.name].is_a?(Hash)
if dup[f.name].to_json != f.value
f.destroy!
else
dup.delete(f.name)
end
else
t = {}
self.class.append_custom_field(t, f.name, f.value)
if dup.has_key?(f.name) && dup[f.name] == t[f.name]
dup.delete(f.name)
else
f.destroy!
end
end
end
# let's iterate through our arrays and compare them
array_fields.each do |field_name, fields|
if fields.length == dup[field_name].length && fields.map(&:value) == dup[field_name]
dup.delete(field_name)
else
fields.each(&:destroy!)
end
end
dup.each do |k, v|
field_type = self.class.get_custom_field_type(k)
if v.is_a?(Array) && field_type != :json
v.each { |subv| _custom_fields.create!(name: k, value: subv) }
else
create_singular(k, v, field_type)
end
end
end
on_custom_fields_change
refresh_custom_fields_from_db
end
end
# We support unique indexes on certain fields. In the event two concurrent processes attempt to
# update the same custom field we should catch the error and perform an update instead.
def create_singular(name, value, field_type = nil)
write_value = value.is_a?(Hash) || field_type == :json ? value.to_json : value
write_value = "t" if write_value.is_a?(TrueClass)
write_value = "f" if write_value.is_a?(FalseClass)
row_count = DB.exec(<<~SQL, name: name, value: write_value, id: id, now: Time.zone.now)
INSERT INTO #{_custom_fields.table_name} (#{custom_fields_fk}, name, value, created_at, updated_at)
VALUES (:id, :name, :value, :now, :now)
ON CONFLICT DO NOTHING
SQL
_custom_fields.where(name: name).update_all(value: write_value) if row_count == 0
end
protected
def refresh_custom_fields_from_db
target = HashWithIndifferentAccess.new
_custom_fields
.order("id asc")
.pluck(:name, :value)
.each { |key, value| self.class.append_custom_field(target, key, value) }
@custom_fields_orig = target
@custom_fields = @custom_fields_orig.deep_dup
end
end