forked from mbleigh/acts-as-taggable-on
/
core.rb
262 lines (205 loc) · 10.5 KB
/
core.rb
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module ActsAsTaggableOn::Taggable
module Core
def self.included(base)
base.send :include, ActsAsTaggableOn::Taggable::Core::InstanceMethods
base.extend ActsAsTaggableOn::Taggable::Core::ClassMethods
base.class_eval do
attr_writer :custom_contexts
after_save :save_tags
end
base.initialize_acts_as_taggable_on_core
end
module ClassMethods
def initialize_acts_as_taggable_on_core
tag_types.map(&:to_s).each do |tags_type|
tag_type = tags_type.to_s.singularize
context_taggings = "#{tag_type}_taggings".to_sym
context_tags = tags_type.to_sym
class_eval do
has_many context_taggings, :as => :taggable, :dependent => :destroy, :include => :tag, :class_name => "ActsAsTaggableOn::Tagging",
:conditions => ["#{ActsAsTaggableOn::Tagging.table_name}.tagger_id IS NULL AND #{ActsAsTaggableOn::Tagging.table_name}.context = ?", tags_type]
has_many context_tags, :through => context_taggings, :source => :tag, :class_name => "ActsAsTaggableOn::Tag"
end
class_eval %(
def #{tag_type}_list
tag_list_on('#{tags_type}')
end
def #{tag_type}_list=(new_tags)
set_tag_list_on('#{tags_type}', new_tags)
end
def all_#{tags_type}_list
all_tags_list_on('#{tags_type}')
end
)
end
end
def acts_as_taggable_on(*args)
super(*args)
initialize_acts_as_taggable_on_core
end
# all column names are necessary for PostgreSQL group clause
def grouped_column_names_for(object)
object.column_names.map { |column| "#{object.table_name}.#{column}" }.join(", ")
end
##
# Return a scope of objects that are tagged with the specified tags.
#
# @param tags The tags that we want to query for
# @param [Hash] options A hash of options to alter you query:
# * <tt>:exclude</tt> - if set to true, return objects that are *NOT* tagged with the specified tags
# * <tt>:any</tt> - if set to true, return objects that are tagged with *ANY* of the specified tags
# * <tt>:match_all</tt> - if set to true, return objects that are *ONLY* tagged with the specified tags
#
# Example:
# User.tagged_with("awesome", "cool") # Users that are tagged with awesome and cool
# User.tagged_with("awesome", "cool", :exclude => true) # Users that are not tagged with awesome or cool
# User.tagged_with("awesome", "cool", :any => true) # Users that are tagged with awesome or cool
# User.tagged_with("awesome", "cool", :match_all => true) # Users that are tagged with just awesome and cool
def tagged_with(tags, options = {})
tag_list = ActsAsTaggableOn::TagList.from(tags)
return {} if tag_list.empty?
joins = []
conditions = []
context = options.delete(:on)
if options.delete(:exclude)
tags_conditions = tag_list.map { |t| sanitize_sql(["#{ActsAsTaggableOn::Tag.table_name}.name LIKE ?", t]) }.join(" OR ")
conditions << "#{table_name}.#{primary_key} NOT IN (SELECT #{ActsAsTaggableOn::Tagging.table_name}.taggable_id FROM #{ActsAsTaggableOn::Tagging.table_name} JOIN #{ActsAsTaggableOn::Tag.table_name} ON #{ActsAsTaggableOn::Tagging.table_name}.tag_id = #{ActsAsTaggableOn::Tag.table_name}.id AND (#{tags_conditions}) WHERE #{ActsAsTaggableOn::Tagging.table_name}.taggable_type = #{quote_value(base_class.name)})"
elsif options.delete(:any)
conditions << tag_list.map { |t| sanitize_sql(["#{ActsAsTaggableOn::Tag.table_name}.name LIKE ?", t]) }.join(" OR ")
tagging_join = " JOIN #{ActsAsTaggableOn::Tagging.table_name}" +
" ON #{ActsAsTaggableOn::Tagging.table_name}.taggable_id = #{table_name}.#{primary_key}" +
" AND #{ActsAsTaggableOn::Tagging.table_name}.taggable_type = #{quote_value(base_class.name)}" +
" JOIN #{ActsAsTaggableOn::Tag.table_name}" +
" ON #{ActsAsTaggableOn::Tagging.table_name}.tag_id = #{ActsAsTaggableOn::Tag.table_name}.id"
tagging_join << " AND " + sanitize_sql(["#{ActsAsTaggableOn::Tagging.table_name}.context = ?", context.to_s]) if context
select_clause = "DISTINCT #{table_name}.*" unless context
joins << tagging_join
else
tags = ActsAsTaggableOn::Tag.named_any(tag_list)
return scoped(:conditions => "1 = 0") unless tags.length == tag_list.length
tags.each do |tag|
safe_tag = tag.name.gsub(/[^a-zA-Z0-9]/, '')
prefix = "#{safe_tag}_#{rand(1024)}"
taggings_alias = "#{undecorated_table_name}_taggings_#{prefix}"
tagging_join = "JOIN #{ActsAsTaggableOn::Tagging.table_name} #{taggings_alias}" +
" ON #{taggings_alias}.taggable_id = #{table_name}.#{primary_key}" +
" AND #{taggings_alias}.taggable_type = #{quote_value(base_class.name)}" +
" AND #{taggings_alias}.tag_id = #{tag.id}"
tagging_join << " AND " + sanitize_sql(["#{taggings_alias}.context = ?", context.to_s]) if context
joins << tagging_join
end
end
taggings_alias, tags_alias = "#{undecorated_table_name}_taggings_group", "#{undecorated_table_name}_tags_group"
if options.delete(:match_all)
joins << "LEFT OUTER JOIN #{ActsAsTaggableOn::Tagging.table_name} #{taggings_alias}" +
" ON #{taggings_alias}.taggable_id = #{table_name}.#{primary_key}" +
" AND #{taggings_alias}.taggable_type = #{quote_value(base_class.name)}"
group_columns = ActsAsTaggableOn::Tag.using_postgresql? ? grouped_column_names_for(self) : "#{table_name}.#{primary_key}"
group = "#{group_columns} HAVING COUNT(#{taggings_alias}.taggable_id) = #{tags.size}"
end
scoped(:select => select_clause,
:joins => joins.join(" "),
:group => group,
:conditions => conditions.join(" AND "),
:order => options[:order],
:readonly => false)
end
def is_taggable?
true
end
end
module InstanceMethods
# all column names are necessary for PostgreSQL group clause
def grouped_column_names_for(object)
self.class.grouped_column_names_for(object)
end
def custom_contexts
@custom_contexts ||= []
end
def is_taggable?
self.class.is_taggable?
end
def add_custom_context(value)
custom_contexts << value.to_s unless custom_contexts.include?(value.to_s) or self.class.tag_types.map(&:to_s).include?(value.to_s)
end
def cached_tag_list_on(context)
self["cached_#{context.to_s.singularize}_list"]
end
def tag_list_cache_set_on(context)
variable_name = "@#{context.to_s.singularize}_list"
!instance_variable_get(variable_name).nil?
end
def tag_list_cache_on(context)
variable_name = "@#{context.to_s.singularize}_list"
instance_variable_get(variable_name) || instance_variable_set(variable_name, ActsAsTaggableOn::TagList.new(tags_on(context).map(&:name)))
end
def tag_list_on(context)
add_custom_context(context)
tag_list_cache_on(context)
end
def all_tags_list_on(context)
variable_name = "@all_#{context.to_s.singularize}_list"
return instance_variable_get(variable_name) if instance_variable_get(variable_name)
instance_variable_set(variable_name, ActsAsTaggableOn::TagList.new(all_tags_on(context).map(&:name)).freeze)
end
##
# Returns all tags of a given context
def all_tags_on(context)
tag_table_name = ActsAsTaggableOn::Tag.table_name
tagging_table_name = ActsAsTaggableOn::Tagging.table_name
opts = ["#{tagging_table_name}.context = ?", context.to_s]
scope = base_tags.where(opts)
if ActsAsTaggableOn::Tag.using_postgresql?
group_columns = grouped_column_names_for(ActsAsTaggableOn::Tag)
scope = scope.order("max(#{tagging_table_name}.created_at)").group(group_columns)
else
scope = scope.group("#{ActsAsTaggableOn::Tag.table_name}.#{ActsAsTaggableOn::Tag.primary_key}")
end
scope.all
end
##
# Returns all tags that are not owned of a given context
def tags_on(context)
base_tags.where(["#{ActsAsTaggableOn::Tagging.table_name}.context = ? AND #{ActsAsTaggableOn::Tagging.table_name}.tagger_id IS NULL", context.to_s]).all
end
def set_tag_list_on(context, new_list)
add_custom_context(context)
variable_name = "@#{context.to_s.singularize}_list"
instance_variable_set(variable_name, ActsAsTaggableOn::TagList.from(new_list))
end
def tagging_contexts
custom_contexts + self.class.tag_types.map(&:to_s)
end
def reload(*args)
self.class.tag_types.each do |context|
instance_variable_set("@#{context.to_s.singularize}_list", nil)
instance_variable_set("@all_#{context.to_s.singularize}_list", nil)
end
super(*args)
end
def save_tags
tagging_contexts.each do |context|
next unless tag_list_cache_set_on(context)
tag_list = tag_list_cache_on(context).uniq
# Find existing tags or create non-existing tags:
tag_list = ActsAsTaggableOn::Tag.find_or_create_all_with_like_by_name(tag_list)
current_tags = tags_on(context)
old_tags = current_tags - tag_list
new_tags = tag_list - current_tags
# Find taggings to remove:
old_taggings = taggings.where(:tagger_type => nil, :tagger_id => nil,
:context => context.to_s, :tag_id => old_tags).all
if old_taggings.present?
# Destroy old taggings:
ActsAsTaggableOn::Tagging.destroy_all :id => old_taggings.map(&:id)
end
# Create new taggings:
new_tags.each do |tag|
taggings.create!(:tag_id => tag.id, :context => context.to_s, :taggable => self)
end
end
true
end
end
end
end