如何将数据附加到 ruby/rails 中的 json？
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how to append data to json in ruby/rails?
提问by David
Say i have this short code:
说我有这个短代码：
item = Item.find(params[:id])
render :json => item.to_json
but i needed to insert/push extra information to the returned json object, how do i do that?
但我需要向返回的 json 对象插入/推送额外信息，我该怎么做？
Lets say i need to insert this extra info:
假设我需要插入这个额外的信息：
message : "it works"
Thanks.
谢谢。
回答by Dogbert
item = Item.find(params[:id])
item["message"] = "it works"
render :json => item.to_json
回答by NM.
The to_jsonmethod takes an option object as parameter. So what you can do is make a method in your item class called as message and have it return the text that you want as its value .
该to_json方法将一个选项对象作为参数。因此，您可以做的是在您的项目类中创建一个名为 message 的方法，并让它返回您想要的文本作为其值。
class Item < ActiveRecord::Base
def message
"it works"
end
end
render :json => item.to_json(:methods => :message)
回答by Steve
I found the accepted answer now throws deprecation warnings in Rails 3.2.13.
我发现接受的答案现在会在 Rails 3.2.13 中引发弃用警告。
DEPRECATION WARNING: You're trying to create an attribute
message'. Writing arbitrary attributes on a model is deprecated. Please just useattr_writer` etc.
弃用警告：您正在尝试创建属性
message'. Writing arbitrary attributes on a model is deprecated. Please just useattr_writer` 等。
Assuming you don't want to put the suggested attr_writer in your model, you can use the as_jsonmethod (returns a Hash) to tweak your JSON response object.
假设您不想将建议的 attr_writer 放入模型中，您可以使用该as_json方法（返回一个哈希）来调整您的 JSON 响应对象。
item = Item.find(params[:id])
render :json => item.as_json.merge(:message => 'it works')
回答by Stanley Shauro
How to append data to json in ruby/rails 5
如何在 ruby/rails 5 中将数据附加到 json
If you use scaffold, e.g.:
如果您使用脚手架，例如：
rails generate scaffold MyItem
in the view folder you will see next files:
在视图文件夹中，您将看到下一个文件：
app/view/my_item/_my_item.json.jbuilder
app/view/my_item/index.json.jbuilder
so, you can add custom data to json output for an item, just add this:
因此，您可以将自定义数据添加到项目的 json 输出中，只需添加以下内容：
json.extract! my_item, :id, :some_filed, :created_at, :updated_at
json.url my_item_url(my_item, format: :json)
json.my_data my_function(my_item)
As you can see, it's possible to modify as one item json output, as index json output.
如您所见，可以修改为一项 json 输出，作为索引 json 输出。
回答by Leandro Castro
I always use:
我总是使用：
@item = Item.find(params[:id])
render json: { item: @item.map { |p| { id: p.id, name: p.name } }, message: "it works" }
回答by Suprie
Have you tried this ?
你试过这个吗？
item = Item.find(params[:id])
item <<{ :status => "Success" }
render :json => item.to_json
