Question

So I recently created an HABTM relationship between two models (project & user).

Before, I had a user_id column in my project table – that would act like a foreign key. Now there is an entire table that does that.

But how do I reference projects that have a specific user_id & project_id ?

For instance, I used to have a section of my view that looked like this:

<div class="field">
        <%= f.label :project_id %><br />
        <%= collection_select(:stage, :project_id, Project.where(:user_id => current_user), :id, :name) %>
        <br />
    </div>

But how do I now pull the same info from the db, with no model for the HABTM table? The new table is called ‘projects_users’.

My projects model looks like this:

# == Schema Information
# Schema version: 20101125223049
#
# Table name: projects
#
#  id          :integer         not null, primary key
#  name        :string(255)
#  description :string(255)
#  notified    :boolean
#  created_at  :datetime
#  updated_at  :datetime
#

class Project < ActiveRecord::Base

  has_and_belongs_to_many :users
  has_many :stages, :dependent => :destroy
  has_many :uploads
  has_many :comments

  #before_validation { |project| project.user = Authorization.current_user unless project.user }

end

My User Model looks like this:

# == Schema Information
# Schema version: 20101124095341
#
# Table name: users
#
#  id                   :integer         not null, primary key
#  email                :string(255)     default(""), not null
#  encrypted_password   :string(128)     default(""), not null
#  password_salt        :string(255)     default(""), not null
#  reset_password_token :string(255)
#  remember_token       :string(255)
#  remember_created_at  :datetime
#  sign_in_count        :integer         default(0)
#  current_sign_in_at   :datetime
#  last_sign_in_at      :datetime
#  current_sign_in_ip   :string(255)
#  last_sign_in_ip      :string(255)
#  created_at           :datetime
#  updated_at           :datetime
#  username             :string(255)
#  role                 :string(255)
#

class User < ActiveRecord::Base
  # Include default devise modules. Others available are:
  # :token_authenticatable, :confirmable, and :lockable
  devise :database_authenticatable, :registerable, :timeoutable,
         :recoverable, :rememberable, :trackable, :validatable

  # Setup accessible (or protected) attributes for your model
  attr_accessible :email, :password, :password_confirmation, :remember_me

  has_and_belongs_to_many :projects
  has_many :stages
  has_many :uploads
  has_many :comments
  has_many :assignments
  has_many :roles, :through => :assignments

  def role_symbols
    roles.map do |role|
      role.name.underscore.to_sym
    end
  end  
end

As an aside…how do I edit that table from the rails console – without a model?

Thanks.

Answer 1

I’m not sure I fully understand your question, but Project.where(:user_id => current_user) should become current_user.projects

And to add user with id 1 to project with id 3 you’d do

Project.find(3).users << User.find(1)

Is this what you’ve been trying to do ?