Rails协会设计，has_many通过

Question

I am working on a dummy rails application; as part of my programming skills self education. And I am feeling a bit stuck with the rails association concept as I am not sure which is the right way to go for.

In this exercise I want to have the following models:
- User
- Project
- Team

And I would like to create the following associations: - User has many Project
- Project has many User through Team
- Team has many User through Project

The idea is that a user can create a project and on-board or invite other users. Before the project get saved, thanks to a before_create , the application will create a new team Project_Team with the User and the other users he added during the Project creation process.

Of course I am not talking about model dependencies as i will tackle this point once I have the right associations set.

I wrote the following code but I could not get the association, explained above, to working as expected:

class User < ActiveRecord::Base
  has_many :project
  has_many :team, through :project
end

class Project < ActiveRecord::Base
  has_one :team
  has_many :user, through :team
end

class Team < ActiveRecord::Base
  belongs_to :project
  has_many :user, through :project
end

Many thanks for your future help (and tolerance for the "might-be" bad code above).

Cheers

Answer 1

You have to pluralize has_many associations but keep your belongs_to singular. You're also missing colons after the through . Your associations should be:

class User < ActiveRecord::Base
  has_many :projects
  has_many :teams, through: :projects
end

class Project < ActiveRecord::Base
  has_one :team
  has_many :users, through: :team
end

class Team < ActiveRecord::Base
  belongs_to :project
  has_many :users, through: :project
end

Check out the Rails guides for more info.