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Question

我有一个移民类项目这样

class CreateProjects < ActiveRecord::Migration 
def change 
    create_table :projects do |t| 
    t.string :title 
    t.text :description 
    t.boolean :public 
    t.references :user, index: true, foreign_key: true 

    t.timestamps null: false 
    end 
end 
end 

它会在项目表中的列名user_ID的更改外键的列名，但我想的名字列owner_id这样我就可以使用project.owner代替用户。

Answer 1

你可以做到这一点有两种方式：

#app/models/project.rb 
class Project < ActiveRecord::Base 
    belongs_to :owner, class_name: "User", foreign_key: :user_id 
end 

OR

$ rails g migration ChangeForeignKeyForProjects 

# db/migrate/change_foreign_key_for_projects.rb 
class ChangeForeignKeyForProjects < ActiveRecord::Migration 
    def change 
     rename_column :projects, :user_id, :owner_id 
    end 
end 

则：

$ rake db:migrate