Ruby on Rails Active Record关联帮助

Question

I would like to get some suggestions on my Active Record associations.

I want to make sure they're setup in such a way that I can efficiently call the data needed.

Models:

• Users
• Scripts
• Commits

---

• Users can create scripts, which belong to them.
• Then, any user can add commits to any script.

Associations:

class User < ApplicationRecord
  has_many :scripts
  has_many :commits
  has_many :scripts, through: :commits
end

class Script < ApplicationRecord
  belongs_to :user
  has_many :commits
  has_many :users, through: :commits
end

class Commit < ApplicationRecord
  belongs_to :script
  belongs_to :user
end

Some queries I'd like to be able to do:

• A user can see all scripts that belong to them
• A user can see commits made to a particular script of theirs, and all commits across all their scripts
• Users can see commits they've made to a particular script, and all commits they've made

Hope I explained this clearly enough.

Thanks

Answer 1

class User < ApplicationRecord
  has_many :scripts
  has_many :commits, through: :scripts
end

class Script < ApplicationRecord
  belongs_to :user
  has_many :commits
end

class Commit < ApplicationRecord
  belongs_to :script
  belongs_to :user
end

• This is enough

Answer 2

If I understand what you're modeling here, the relationship between User and Script should model ownership, and the indirect relationship through Commit is for contributions. Assuming that's the case, you could add a little more meaning to the relationship names like this:

class User < ApplicationRecord
  has_many :scripts
  has_many :commits
  has_many :contributed_scripts, through: :commits, source: :scripts
end

class Script < ApplicationRecord
  belongs_to :user
  has_many :commits
end

class Commit < ApplicationRecord
  belongs_to :script
  belongs_to :user
end

Answer 3

Just make the role distinctions clear I'd suggest you do...

class Script < ApplicationRecord
  belongs_to :user
  has_many :commits
  has_many :contributors, through: :commits, class_name: 'User'
end