Fix stack level too deep error on reshares

app/models/post.rb

@@ -86,7 +86,7 @@ class Post < ActiveRecord::Base
 
     local_post = Post.where(:guid => self.guid).first
     if local_post && local_post.author_id == self.author_id
-      known_post = user.visible_posts.where(:guid => self.guid).first
+      known_post = user.find_visible_post_by_id(self.guid, :key => :guid)
       if known_post
         if known_post.mutable?
           known_post.update_attributes(self.attributes)

app/models/reshare.rb

@@ -20,12 +20,9 @@ class Reshare < Post
   def receive(recipient, sender)
     local_reshare = Reshare.where(:guid => self.guid).first
     if local_reshare && local_reshare.root.author_id == recipient.person.id
-      if recipient.contact_for(sender)
-        local_reshare.receive(recipient, sender)
-      end
-    else
-      super(recipient, sender)
+      return unless recipient.has_contact_for?(sender)
     end
+    super(recipient, sender)
   end
 
   def comment_email_subject

lib/diaspora/user/querying.rb

@@ -66,6 +66,12 @@ module Diaspora
         Contact.where(:user_id => self.id, :person_id => person_id).includes(:person => :profile).first
       end
 
+      # @param [Person] person
+      # @return [Boolean] whether person is a contact of this user
+      def has_contact_for?(person)
+        Contact.exists?(:user_id => self.id, :person_id => person.id)
+      end
+
       def people_in_aspects(requested_aspects, opts={})
         allowed_aspects = self.aspects & requested_aspects
         person_ids = contacts_in_aspects(allowed_aspects).collect{|contact| contact.person_id}

spec/models/reshare_spec.rb

@@ -26,19 +26,29 @@ describe Reshare do
   end
 
   describe "#receive" do
+    let(:receive) {@reshare.receive(@root.author.owner, @reshare.author)}
     before do
       @reshare = Factory.create(:reshare, :root => Factory(:status_message, :author => bob.person, :public => true))
       @root = @reshare.root
-      @reshare.receive(@root.author.owner, @reshare.author)
     end
 
     it 'increments the reshare count' do
+      receive
       @root.resharers.count.should == 1
     end
 
     it 'adds the resharer to the re-sharers of the post' do
+      receive
       @root.resharers.should include(@reshare.author)
     end
+    it 'does not error if the root author has a contact for the resharer' do
+      bob.share_with @reshare.author, bob.aspects.first
+      proc {
+        Timeout.timeout(5) do
+          receive #This doesn't ever terminate on my machine before it was fixed.
+        end
+      }.should_not raise_error
+    end
   end
 
   describe "XML" do