discourse/app/models/concerns/has_custom_fields.rb

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module HasCustomFields
extend ActiveSupport::Concern
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module Helpers
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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)
else
target[key] = cast_custom_field(key, value, types)
end
end
CUSTOM_FIELD_TRUE ||= ['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 do |t|
return types[t] if key =~ /^#{t}/i
end
types[key]
end
def self.cast_custom_field(key, value, types)
return value unless type = get_custom_field_type(types, key)
case type
when :boolean then !!CUSTOM_FIELD_TRUE.include?(value)
when :integer then value.to_i
when :json then ::JSON.parse(value)
else
value
end
end
end
included do
has_many :_custom_fields, dependent: :destroy, :class_name => "#{name}CustomField"
after_save :save_custom_fields
attr_accessor :preloaded_custom_fields
# 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, whitelisted_fields)
klass = "#{name}CustomField".constantize
foreign_key = "#{name.underscore}_id".to_sym
result = {}
return result if whitelisted_fields.blank?
klass.where(foreign_key => ids, :name => whitelisted_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.preload_custom_fields(objects, fields)
if objects.present?
map = {}
empty = {}
fields.each do |field|
empty[field] = nil
end
objects.each do |obj|
map[obj.id] = obj
obj.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
if preloaded[name].nil?
preloaded.delete(name)
end
HasCustomFields::Helpers.append_field(preloaded, name, value, @custom_field_types)
end
end
end
end
def reload(options = nil)
clear_custom_fields
super
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 PreloadedProxy
def initialize(preloaded)
@preloaded = preloaded
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 StandardError, "Attempting to access a non preloaded custom field, this is disallowed to prevent N+1 queries."
end
end
end
def custom_fields
if @preloaded_custom_fields
return @preloaded_proxy ||= PreloadedProxy.new(@preloaded_custom_fields)
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
def save_custom_fields(force=false)
if force || !custom_fields_clean?
dup = @custom_fields.dup
array_fields = {}
_custom_fields.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
if dup[f.name] != f.value
f.destroy
else
dup.delete(f.name)
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|
if v.is_a? Array
v.each { |subv| _custom_fields.create(name: k, value: subv) }
elsif v.is_a? Hash
_custom_fields.create(name: k, value: v.to_json)
else
_custom_fields.create(name: k, value: v)
end
end
refresh_custom_fields_from_db
end
end
protected
def refresh_custom_fields_from_db
target = Hash.new
_custom_fields.pluck(:name,:value).each do |key, value|
self.class.append_custom_field(target, key, value)
end
@custom_fields_orig = target
@custom_fields = @custom_fields_orig.dup
end
end