Rails通过ID获取关联资源的标题

Question

I have 2 models(Clients and Projects) that are connected like this:

class Project < ActiveRecord::Base
    belongs_to :cliente
end

class Cliente < ActiveRecord::Base
    has_many :projects
end

Projects have a :cliente_id column in its schema, so if I do:

Project.cliente_id I will get the cliente_id correctly.

My doubt is, I want to get the client name from it's id, so I need something like:

Project.cliente_id.name

Which is the correct way to retrieve this info?

Answer 1

You can get the complete Cliente object with project.cliente (note that the _id is not used). So you can use it like a regular Cliente ; for example, to get name just do:

project = Project.find(1)
project.cliente.name

Answer 2

You find associated objects through the association :

project = Project.find(1) # Returns the full `project` object
project.cliente # Returns the full `cliente` object
project.cliente.name # Returns just the `name` attribute
project.cliente_id == project.cliente.id # Returns true