Problem while upgrading from version beta 20 to 2.0.1

[ag]

Hi,

I am currently having a problem when upgrading from version beta 20 to
2.0.1

class User
include Mongoid::Document
include Mongoid::Timestamps

embeds_many :my_relations,
:class_name => 'Relation'
end

class Relation
include Mongoid::Document
include Mongoid::Timestamps

# tried changing this to belongs_to
referenced_in :target,
:class_name => 'User'
embedded_in :owner,
:class_name => 'User',
:inverse_of => :my_relations
end

Some how this does not work even after changing the referenced_in
macro to 'belongs_to'.
In the relation model I am trying to keep track to which other user is
the current user referenced.

Every time I try to create a new relation I get an error
NoMethodError: undefined method `first' for #<Relation:0x7f325a0f3a78>

Any ideas as to what is going wrong..

regards,
a

[Chen Jack S Y]

Not sure how you tried to create the new relation. Add inverse_of to
User model may help:

embeds_many :my_relations,
:class_name => 'Relation',
:inverse_of => :user

[ag]

Hi Chen,

I am creating user in the following manner..
user.my_relations.create \
:target => target, ....(other
properties)
end

The schema is somewhat like this User has embedded document (array) of
relations, and each relation has attributes and reference to a target
which is another user in db. I think with the new release perhaps it
may not be possible to create a has_one , belongs_to relationship on
the same collection, which is currently the case in my scenario.

[Chen Jack S Y]

Have you tried to replacing has_on/belongs_to with referenced_in or
something else? Did that work for you?

If not, the problem could be an embedding collection is not allowed to
reference to other collections other than its parent.

[Nick Hoffman]

The problem seems to be with the "target" association in Relation. If I set a relation's "target", the error occur. However, if I set a relation's "target_id", the error doesn't occur. Until this bug is fixed, you can use that as a workaround. Eg:

u1 = User.first
u2 = User.new
u2.my_relations.create :target_id => u1.id
u2.save

[Nick Hoffman]

BTW, please open an issue on GitHub for this. Include the code sample that you provided in your first post, as well as the workaround that I mentioned in my previous post.

https://github.com/mongoid/mongoid/issues