訂購ActiveRecord的結果按字母順序

Question

我有一個控制器的方法是這樣的：

def index 
    @categories = Category.all 
end 

如何訂購@categories名稱的字母順序？

Answer 1

您可以order：

@categories = Category.order(:name) 

Answer 2

在你類別控制器：

class CategoriesController < ApplicationController 

    def index 
     @categories = Category.order(:name) 
    end 
    end 

這將默認順序:name列的字母順序排列。

Answer 3

#default ascending 

    class CategoriesController < ApplicationController 

    def index 
     @categories = Category.order(:name) 
    end 
    end 

#explicit ascending if you were chaining a scope that has some other default order 

    class CategoriesController < ApplicationController 

    def index 
     @categories = Category.tags.order(name: :asc) 
    end 
    end 

#decending 

class CategoriesController < ApplicationController 

    def index 
    @categories = Category.tags.order(name: :desc) 
    end 
end