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[英]How do I change nil to null before rendering JSON from a Ruby object?
[英]When rendering an object in JSON from the controller, how do I include a field from the object's parent?
我正在使用Rails 4.2.7。 通過show方法返回對象時,我想包含來自對象父對象的對象。 我試過了
def show
respond_to do |format|
@my_object = MyObject.find(params[:id])
format.json { render :json => @my_object.to_json(:include => [:parent, :include => :address]) }
end
end
但是這會產生錯誤
NoMethodError (undefined method `include' for #<MyObject:0x007fa1b433d788>):
包含我父母的對象的正確方法是什么?
編輯:這是我的Rails應用程序中的父模型
class Parent < ActiveRecord::Base
belongs_to :address, :autosave => true #, dependent: :destroy
試試這個
def show
@my_object = MyObject.find(params[:id])
render :json => @my_object.to_json(:include => [:parent => {:include => :address}])
end
您已在include語句中添加了include,
@my_object.to_json(:include => [:parent, **:include** => :address])
因此,Rails正在搜索包括作為方法或模型之一。
您可以使用這樣的數組來包含多個關系。
:include => [:parent, :address]
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