Module: ActsAsTaggableOn::Taggable::Core

Defined in:
lib/acts_as_taggable_on/acts_as_taggable_on/core.rb

Defined Under Namespace

Modules: ClassMethods

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.included(base) ⇒ Object 



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# File 'lib/acts_as_taggable_on/acts_as_taggable_on/core.rb', line 3

def self.included(base)
  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

Instance Method Details

#add_custom_context(value) ⇒ Object 



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# File 'lib/acts_as_taggable_on/acts_as_taggable_on/core.rb', line 245

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

#all_tags_list_on(context) ⇒ Object 



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# File 'lib/acts_as_taggable_on/acts_as_taggable_on/core.rb', line 274

def all_tags_list_on(context)
  variable_name = "@all_#{context.to_s.singularize}_list"
  return instance_variable_get(variable_name) if instance_variable_defined?(variable_name) && instance_variable_get(variable_name)

  instance_variable_set(variable_name, ActsAsTaggableOn::TagList.new(all_tags_on(context).map(&:name)).freeze)
end

#all_tags_on(context) ⇒ Object

Returns all tags of a given context



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# File 'lib/acts_as_taggable_on/acts_as_taggable_on/core.rb', line 283

def all_tags_on(context)
  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.order("max(#{tagging_table_name}.created_at)").group(group_columns)
  else
    scope.group("#{ActsAsTaggableOn::Tag.table_name}.#{ActsAsTaggableOn::Tag.primary_key}")
  end.to_a
end

#cached_tag_list_on(context) ⇒ Object 



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# File 'lib/acts_as_taggable_on/acts_as_taggable_on/core.rb', line 249

def cached_tag_list_on(context)
  self["cached_#{context.to_s.singularize}_list"]
end

#custom_contexts ⇒ Object 



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# File 'lib/acts_as_taggable_on/acts_as_taggable_on/core.rb', line 237

def custom_contexts
  @custom_contexts ||= []
end

#grouped_column_names_for(object) ⇒ Object

all column names are necessary for PostgreSQL group clause



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# File 'lib/acts_as_taggable_on/acts_as_taggable_on/core.rb', line 233

def grouped_column_names_for(object)
  self.class.grouped_column_names_for(object)
end

#is_taggable? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/acts_as_taggable_on/acts_as_taggable_on/core.rb', line 241

def is_taggable?
  self.class.is_taggable?
end

#load_tags(tag_list) ⇒ Object

Find existing tags or create non-existing tags



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# File 'lib/acts_as_taggable_on/acts_as_taggable_on/core.rb', line 345

def load_tags(tag_list)
  ActsAsTaggableOn::Tag.find_or_create_all_with_like_by_name(tag_list)
end

#process_dirty_object(context, new_list) ⇒ Object 



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# File 'lib/acts_as_taggable_on/acts_as_taggable_on/core.rb', line 320

def process_dirty_object(context,new_list)
  value = new_list.is_a?(Array) ? ActsAsTaggableOn::TagList.new(new_list) : new_list
  attrib = "#{context.to_s.singularize}_list"

  if changed_attributes.include?(attrib)
    # The attribute already has an unsaved change.
    old = changed_attributes[attrib]
    changed_attributes.delete(attrib) if (old.to_s == value.to_s)
  else
    old = tag_list_on(context).to_s
    changed_attributes[attrib] = old if (old.to_s != value.to_s)
  end
end

#reload(*args) ⇒ Object 



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# File 'lib/acts_as_taggable_on/acts_as_taggable_on/core.rb', line 334

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

#save_tags ⇒ Object 



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# File 'lib/acts_as_taggable_on/acts_as_taggable_on/core.rb', line 349

def save_tags
  tagging_contexts.each do |context|
    next unless tag_list_cache_set_on(context)
    # List of currently assigned tag names
    tag_list = tag_list_cache_on(context).uniq

    # Find existing tags or create non-existing tags:
    tags = load_tags(tag_list)

    # Tag objects for currently assigned tags
    current_tags = tags_on(context)

    # Tag maintenance based on whether preserving the created order of tags
    if self.class.preserve_tag_order?
      old_tags, new_tags = current_tags - tags, tags - current_tags

      shared_tags = current_tags & tags

      if shared_tags.any? && tags[0...shared_tags.size] != shared_tags
        index = shared_tags.each_with_index { |_, i| break i unless shared_tags[i] == tags[i] }

        # Update arrays of tag objects
        old_tags |= current_tags[index...current_tags.size]
        new_tags |= current_tags[index...current_tags.size] & shared_tags

        # Order the array of tag objects to match the tag list
        new_tags = tags.map do |t|
          new_tags.find { |n| n.name.downcase == t.name.downcase }
        end.compact
      end
    else
      # Delete discarded tags and create new tags
      old_tags = current_tags - tags
      new_tags = tags - current_tags
    end

    # Find taggings to remove:
    if old_tags.present?
      old_taggings = taggings.where(:tagger_type => nil, :tagger_id => nil, :context => context.to_s, :tag_id => old_tags)
    end

    # Destroy old taggings:
    if old_taggings.present?
      ActsAsTaggableOn::Tagging.destroy_all "#{ActsAsTaggableOn::Tagging.primary_key}".to_sym => 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

#set_tag_list_on(context, new_list) ⇒ Object 



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# File 'lib/acts_as_taggable_on/acts_as_taggable_on/core.rb', line 307

def set_tag_list_on(context, new_list)
  add_custom_context(context)

  variable_name = "@#{context.to_s.singularize}_list"
  process_dirty_object(context, new_list) unless custom_contexts.include?(context.to_s)

  instance_variable_set(variable_name, ActsAsTaggableOn::TagList.from(new_list))
end

#tag_list_cache_on(context) ⇒ Object 



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# File 'lib/acts_as_taggable_on/acts_as_taggable_on/core.rb', line 258

def tag_list_cache_on(context)
  variable_name = "@#{context.to_s.singularize}_list"
  if instance_variable_get(variable_name)
    instance_variable_get(variable_name)
  elsif cached_tag_list_on(context) && self.class.caching_tag_list_on?(context)
    instance_variable_set(variable_name, ActsAsTaggableOn::TagList.from(cached_tag_list_on(context)))
  else
    instance_variable_set(variable_name, ActsAsTaggableOn::TagList.new(tags_on(context).map(&:name)))
  end
end

#tag_list_cache_set_on(context) ⇒ Object 



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# File 'lib/acts_as_taggable_on/acts_as_taggable_on/core.rb', line 253

def tag_list_cache_set_on(context)
  variable_name = "@#{context.to_s.singularize}_list"
  instance_variable_defined?(variable_name) && !instance_variable_get(variable_name).nil?
end

#tag_list_on(context) ⇒ Object 



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# File 'lib/acts_as_taggable_on/acts_as_taggable_on/core.rb', line 269

def tag_list_on(context)
  add_custom_context(context)
  tag_list_cache_on(context)
end

#tagging_contexts ⇒ Object 



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# File 'lib/acts_as_taggable_on/acts_as_taggable_on/core.rb', line 316

def tagging_contexts
  custom_contexts + self.class.tag_types.map(&:to_s)
end

#tags_on(context) ⇒ Object

Returns all tags that are not owned of a given context



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# File 'lib/acts_as_taggable_on/acts_as_taggable_on/core.rb', line 299

def tags_on(context)
  scope = base_tags.where(["#{ActsAsTaggableOn::Tagging.table_name}.context = ? AND #{ActsAsTaggableOn::Tagging.table_name}.tagger_id IS NULL", context.to_s])
  # when preserving tag order, return tags in created order
  # if we added the order to the association this would always apply
  scope = scope.order("#{ActsAsTaggableOn::Tagging.table_name}.id") if self.class.preserve_tag_order?
  scope
end