Module: RocketTag::Taggable::ClassMethods
- Defined in:
- lib/rocket_tag/taggable.rb
Instance Method Summary collapse
- #_with_tag_context(context) ⇒ Object
- #attr_taggable(*contexts) ⇒ Object
- #rocket_tag ⇒ Object
- #setup_for_rocket_tag ⇒ Object
-
#tagged_with(tags_list, options = {}) ⇒ Object
Generates a query that provides the matches along with an extra column :tags_count.
-
#tagged_with_sifter(tags_list, options = {}) ⇒ Object
Generates a sifter or a where clause depending on options.
Instance Method Details
#_with_tag_context(context) ⇒ Object
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# File 'lib/rocket_tag/taggable.rb', line 105 def _with_tag_context context if context where{taggings.context == my{context} } else where{ } end end |
#attr_taggable(*contexts) ⇒ Object
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# File 'lib/rocket_tag/taggable.rb', line 204 def attr_taggable *contexts if contexts.blank? contexts = [:tag] end rocket_tag.contexts += contexts setup_for_rocket_tag contexts.each do |context| class_eval do has_many "#{context}_taggings".to_sym, :source => :taggable, :as => :taggable, :conditions => { :context => context } has_many "#{context}_tags".to_sym, :source => :tag, :through => :taggings, :conditions => [ "taggings.context = ?", context ] validate context do if not send(context).kind_of? Enumerable errors.add context, :invalid end end # Return an array of RocketTag::Tags for the context define_method "#{context}" do read_context(context) end define_method "#{context}=" do |list| list = Manager. list # Ensure the tags are loaded write_context(context, list) (@tag_dirty ||= Set.new) << context end end end end |
#rocket_tag ⇒ Object
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# File 'lib/rocket_tag/taggable.rb', line 101 def rocket_tag @rocket_tag ||= RocketTag::Taggable::Manager.new(self) end |
#setup_for_rocket_tag ⇒ Object
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# File 'lib/rocket_tag/taggable.rb', line 160 def setup_for_rocket_tag unless @setup_for_rocket_tag @setup_for_rocket_tag = true class_eval do default_scope do preload{taggings}.preload{} end before_save do @tag_dirty ||= Set.new @tag_dirty.each do |context| # Get the current tags for this context list = send(context) # Destroy all taggings context # Find existing tags = Tag.where{name.in(my{list})} exisiting_tag_names = .map &:name # Find missing tags = list - exisiting_tag_names # Create missing tags = .map do |tag_name| Tag.create :name => tag_name end # Recreate taggings = + .each do |tag| tagging = Tagging.new :tag => tag, :taggable => self, :context => context, :tagger => nil self.taggings << tagging end end @tag_dirty = Set.new end end end end |
#tagged_with(tags_list, options = {}) ⇒ Object
Generates a query that provides the matches along with an extra column :tags_count.
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# File 'lib/rocket_tag/taggable.rb', line 127 def tagged_with , = {} on = .delete :on inner = select{count(~id).as()} .select("#{self.table_name}.*"). joins{}. where{.name.in(my{})}. _with_tag_context(on). group{~id} # Wrap the inner query with an outer query to shield # the group and aggregate clauses from downstream # queries r = from("(#{inner.to_sql}) #{table_name}") if .delete :all r = r.where{==my{.length}} end if min = .delete(:min) r = r.where{>=my{min}} end if .delete :sifter squeel do id.in(r.select{"id"}) end else r.select("*") end end |
#tagged_with_sifter(tags_list, options = {}) ⇒ Object
Generates a sifter or a where clause depending on options. The sifter generates a subselect with the body of the clause wrapped up so that it can be used as a condition within another squeel statement.
Query optimization is left up to the SQL engine.
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# File 'lib/rocket_tag/taggable.rb', line 120 def tagged_with_sifter , = {} [:sifter] = true tagged_with , end |