Rails 4: How to use includes() with where() to retrieve associated objects

Rails 4: How to use includes() with where() to retrieve associated objects

I can't figure out how to user the .where() method to retrieve associated
model data. In this example, Projects belongs_to Users...
class Project < ActiveRecord::Base
belongs_to :user
has_many :videos
end
class User < ActiveRecord::Base
has_many :projects
end
class ProjectsController < ApplicationController
def invite
@project = Project.includes([:user]).where( {:hashed_id=>params[:id]}
).first
end
In App/views/projects/invite.html.erg <%= debug( @project ) %> returns:
--- !ruby/object:Project
attributes:
id: 22
name: Some Project Name
belongs_to: 1
instructions: Bla bla bla
active: true
max_duration: 2
max_videos:
created_at: 2013-08-26 15:56:50.000000000 Z
updated_at: 2013-08-26 15:56:50.000000000 Z
hashed_id: '1377532589'
Shouldn't the associated User hash/array be included in this? I know I
could manually add it by calling a second find/where ( @project.user =
User.where( {:id=>@project.belongs_to} ) but this doesn't feel like "The
Rails Way". What is?
Solution My initial question was formulated under the incorrect assumption
that debug() would return associated objects (this works in cakePHP
because it bundles everything into arrays).
So my original code should work. However, I had incorrectly named the
foreign key filed in the table. I got confused by looking at the migration
method t.belongs_to (which automatically creates the correctly named
foreign_key field, not a field named "belongs_to"). So I also had to
rename that column to user_id and now it works just as described in
@Veraticus's answer below.