Created
November 14, 2015 00:08
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module Taggable | |
module ClassMethods | |
def taggable *tags | |
tags.each do |tag_type| | |
attr_accessible :"#{tag_type}_string", :"#{tag_type}_array" | |
has_many tag_type, -> { order(name: :asc) }, as: :taggable, dependent: :destroy | |
if "#{tag_type}_string".in? self.column_names or :"#{tag_type}_string".in? self.instance_methods | |
before_save :"format_#{tag_type}_string", if: lambda {|m| m.send("#{tag_type}_string_changed?")} | |
after_save :"save_#{tag_type}", if: lambda {|m| m.send("#{tag_type}_string_changed?")} | |
self.send :define_method, "#{tag_type}_cached" do | |
eval " | |
#{tag_type}_string.present? ? #{tag_type}_string.split(',').map{ |s| s.strip } : [] | |
" | |
end | |
self.send :define_method, "#{tag_type}_array" do | |
eval "#{tag_type}_cached" | |
end | |
self.send :define_method, "#{tag_type}_array=" do |val| | |
eval " | |
self.#{tag_type}_string = val.select{|v| v.present?}.join(',') | |
" | |
end | |
self.send :define_method, "#{tag_type}_string_from_tags" do | |
eval " | |
self.#{tag_type}_string = #{tag_type}.pluck(:name).join(',') | |
" | |
end | |
self.send :define_method, "format_#{tag_type}_string" do | |
eval " | |
tags = #{tag_type}_string.split(',') | |
self.#{tag_type}_string = tags.map{|t| t.strip }.sort.join(', ') | |
" | |
end | |
else | |
after_save :"save_#{tag_type}" | |
self.send :define_method, "#{tag_type}_string" do | |
eval " | |
@#{tag_type}_string ||= #{tag_type}.order(:name).pluck(:name).join(', ') | |
" | |
end | |
self.send :define_method, "#{tag_type}_string=" do |val| | |
eval " | |
@#{tag_type}_string_was = #{tag_type}_string | |
@#{tag_type}_string = val | |
" | |
end | |
self.send :define_method, "#{tag_type}_string_was" do | |
eval " | |
@#{tag_type}_string_was ||= #{tag_type}_string | |
" | |
end | |
self.send :define_method, "#{tag_type}_string_changed?" do | |
eval " | |
#{tag_type}_string_was != #{tag_type}_string | |
" | |
end | |
end | |
self.send :define_method, "save_#{tag_type}" do | |
eval " | |
tags = #{tag_type}_string.split(',').map{ |s| s.strip } | |
existing = #{tag_type}.pluck(:name) | |
(tags - existing).each do |tag| | |
#{tag_type}.create(name: tag) if tag.present? | |
end | |
deleted = existing - tags | |
#{tag_type}.where('tags.name IN (?)', deleted).destroy_all if deleted.any? | |
" | |
end | |
end | |
end | |
end | |
module InstanceMethods | |
end | |
def self.included base | |
base.send :include, InstanceMethods | |
base.send :extend, ClassMethods | |
end | |
end |
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