Updates inverse counter caches when #collection_singular_ids= is called for an object extending ActiveRecord::Base
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module DistantCounters | |
extend ActiveSupport::Concern | |
included do | |
reflect_on_all_associations.each do |reflection| | |
next unless reflection.macro == :has_many and reflection.is_a? ActiveRecord::Reflection::ThroughReflection | |
next unless reflection.klass.column_names.include? "#{name.underscore.pluralize}_count" | |
assoc_name = reflection.name.to_s.singularize | |
redefine_method "#{assoc_name}_ids=" do |ids| | |
counter_cache_key = "#{self.class.name.underscore.pluralize}_count" | |
new_ids = ids.map(&:to_s).reject(&:empty?).map(&:to_i) | |
old_ids = send "#{assoc_name}_ids" | |
(old_ids - new_ids).each { |an_id| reflection.klass.decrement_counter counter_cache_key, an_id } | |
(new_ids - old_ids).each { |an_id| reflection.klass.increment_counter counter_cache_key, an_id } | |
association(assoc_name.pluralize.to_sym).ids_writer ids | |
end | |
end | |
end | |
end |
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