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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。 通过show方法返回对象时,我想包含来自对象父对象的对象。 我试过了
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
但是这会产生错误
NoMethodError (undefined method `include' for #<MyObject:0x007fa1b433d788>):
包含我父母的对象的正确方法是什么?
编辑:这是我的Rails应用程序中的父模型
class Parent < ActiveRecord::Base
belongs_to :address, :autosave => true #, dependent: :destroy
试试这个
def show
@my_object = MyObject.find(params[:id])
render :json => @my_object.to_json(:include => [:parent => {:include => :address}])
end
您已在include语句中添加了include,
@my_object.to_json(:include => [:parent, **:include** => :address])
因此,Rails正在搜索包括作为方法或模型之一。
您可以使用这样的数组来包含多个关系。
:include => [:parent, :address]
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