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POStrange mongoid error "Mongoid::Errors::InvalidCollection: ... it is an embedded document, please access a collection from the root document."
 

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  1. POStrange mongoid error "Mongoid::Errors::InvalidCollection: ... it is an embedded document, please access a collection from the root document."
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    <p>I am getting this error in my rails 3 application. </p> <pre><code>Mongoid::Errors::InvalidCollection: Access to the collection for Match is not allowed since it is an embedded document, please access a collection from the root document. </code></pre> <p>Here is the corresponding code structure</p> <p>Match class</p> <pre><code>Stateflow.persistence = :mongoid class Match &lt; GmMongo::Base include Stateflow #attributes field :name, :type=&gt;String field :match_type, :type=&gt;String field :state #state transistions stateflow do state_column :state initial :unlocked state :unlocked state :locked event :lock do transitions :from =&gt; :unlocked, :to =&gt; :locked end event :unlock do transitions :from =&gt; :locked, :to =&gt; :unlocked end end #relations embeds_many :players has_many :messages, :class_name=&gt;:match_messages.to_s.classify belongs_to :game embeds_many :groups #validations validates_presence_of :name validates_presence_of :match_type def send_message(match_message) # #TODO: raise exception if the argument is invalid. i.e. Not of class MatchMessage options = {} unless match_message.target_user.blank? options = { :audience=&gt;:single_player, :target_player=&gt;match_message.target_user } else unless match_message.group.blank? options = { :audience=&gt;:group, :group=&gt;match_message.group } else options = { :audience=&gt;:match, :match=&gt;match_message.match } end end args = OpenHash[{ :message=&gt;match_message.content, :game_id=&gt;match_message.match.game.id, }.merge(options)] Message.send_notification(args) #Set the sent_at attribute for message being sent. match_message.sent_at=Time.now match_message.save! end def get_devices self.players.collect{|player| player.device} end end </code></pre> <p>Player class</p> <pre><code>class Player include Mongoid::Document #belongs_to :user #belongs_to :device field :user_id, :type=&gt;BSON::ObjectId field :device_id, :type=&gt;BSON::ObjectId has_many :sent_messages, :class_name=&gt;"MatchMessage", :foreign_key=&gt;:sender_id has_many :targeted_messages, :class_name=&gt;"MatchMessage", :foreign_key=&gt;:target_user_id embedded_in :match embedded_in :group validates_presence_of :user validates_presence_of :device validates_presence_of :match validates_uniqueness_of :user_id, :scope =&gt; [:device_id, :match_id], :message=&gt;"Player already exists." #A workaround for mixing relational and embedded references def user=(user) self[:user_id]=user.id end def user User.find(self.user_id) unless self.user_id.blank? end def device=(device) self[:device_id]=device.id end def device Device.find(self.device_id) unless self.device_id.blank? end end </code></pre> <p>Group class</p> <pre><code>class Group &lt; GmMongo::Base field :name, :type=&gt;String embedded_in :match #embeds_many :players #has_many :messages, :class_name=&gt;:match_messages.to_s.classify validates_presence_of :name, :message=&gt;"Please provide a name for this group." validates_uniqueness_of :name, :scope =&gt; [:match_id], :message=&gt;"This group in this match already exists." def get_devices self.players.collect{|player| player.device} end end </code></pre> <p>Group and Player are embedded into Match. </p> <p>When I try to run</p> <pre><code>Match.first.groups.new </code></pre> <p>I got this error</p> <pre><code>Mongoid::Errors::InvalidCollection: Access to the collection for Match is not allowed since it is an embedded document, please access a collection from the root document. </code></pre> <p>Any help would be greatly appreciated.</p>
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