Module: GroupedModel::ClassMethods

Defined in:
lib/grouped_model.rb

Instance Method Summary collapse

Instance Method Details

#has_groups(options = {}) ⇒ Object Also known as: has_group



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# File 'lib/grouped_model.rb', line 12

def has_groups(options={})
  return if has_groups?
  
  class_eval {
    include GroupedModel::GroupedInstanceMethods

    def self.has_groups?
      true
    end
    
    def self.visible
      visible_to(nil)
    end
    
    unless instance_methods.include? 'visible_to?'
      def visible_to?(reader)
        return true
      end
    end
    alias_method_chain :visible_to?, :groups
  }
  
  has_many :permissions, :as => :permitted
  has_many :groups, :through => :permissions
  Group.define_retrieval_methods(self.to_s)

  named_scope :visible_to, lambda { |reader| 
    if reader.nil? || reader.groups.empty?
      conditions = "pp.group_id IS NULL"
    else
      ids = reader.group_ids
      conditions = reader.nil? ? "pp.group_id IS NULL" : ["pp.group_id IS NULL OR pp.group_id IN(#{ids.map{"?"}.join(',')})", *ids]
    end
    {
      :joins => "LEFT OUTER JOIN permissions as pp on pp.permitted_id = #{self.table_name}.id AND pp.permitted_type = '#{self.to_s}'",
      :group => column_names.map { |n| self.table_name + '.' + n }.join(','),
      :conditions => conditions,
      :readonly => false
    } 
  }

  named_scope :ungrouped, {
    :select => "#{self.table_name}.*, count(pp.id) as group_count",
    :joins => "LEFT OUTER JOIN permissions as pp on pp.permitted_id = #{self.table_name}.id AND pp.permitted_type = '#{self.to_s}'", 
    :having => "group_count = 0",
    :group => column_names.map { |n| self.table_name + '.' + n }.join(','),    # postgres requires that we group by all selected (but not aggregated) columns
    :readonly => false
  } do
    def count
      length
    end
  end

  named_scope :grouped, {
    :select => "#{self.table_name}.*, count(pp.id) as group_count",
    :joins => "LEFT OUTER JOIN permissions as pp on pp.permitted_id = #{self.table_name}.id AND pp.permitted_type = '#{self.to_s}'", 
    :having => "group_count > 0",
    :group => column_names.map { |n| self.table_name + '.' + n }.join(','),
    :readonly => false
  } do
    def count
      length
    end
  end
  
  named_scope :belonging_to, lambda { |group| 
    {
      :joins => "INNER JOIN permissions as pp on pp.permitted_id = #{self.table_name}.id AND pp.permitted_type = '#{self.to_s}'", 
      :group => column_names.map { |n| self.table_name + '.' + n }.join(','),
      :conditions => ["pp.group_id = ?)", group.id],
      :readonly => false
    }
  }
        
end

#has_groups?Boolean Also known as: has_group?

Returns:

  • (Boolean)


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# File 'lib/grouped_model.rb', line 7

def has_groups?
  false
end