Question

Rails 2.3.11 application

Mongoid 1.9.2 (latest “legacy” branch)

Since there’s no documentation for Mongoid 1.X branch anymore, I’m struggling with what I’ve got
configured wrong in this example. It seems I’m not querying an embedded document correctly. How
should I be doing it instead?

class GraphLink
  include Mongoid::Document  
  embedded_in :graph_pages, :inverse_of => :graph_links  
end 

class GraphInlink
  include Mongoid::Document  
  embedded_in :graph_pages, :inverse_of => :graph_inlinks  
end

class GraphPage
  include Mongoid::Document

  embeds_many :graph_links
  embeds_many :graph_inlinks

  def add_relationship(link) 
    unless has_link?(url)
      self.graph_links << GraphLink.new(link)
      destination_page = GraphPage.where(:url => link[:url]).first
      destination_page.graph_links << GraphInlinks.new(link)
      destination_page.save
      self.save
    end
  end

  def has_link?(url)
    graph_links.where(:url => url).count > 0
  end

end

At the console, I type

a = GraphPage.new(page_data_1)
a.add_relationship(link1)

And it returns

Error : NoMethodError: undefined method `where' for BSON::OrderedHash:0x00000114c1e8e0 

with the error being the “has_link?” query.

Help!

Answer 1

I’m going to guess that you can’t compose queries like that. Perhaps try

def has_link?(url)
  graph_links.any? { |doc| doc.url == url }
end