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