First, the desired result
页: 1 我愿就此做出回应。
{
"user":
{"username":"Bob!","foo":"whatever","bar":"hello!"},
"items": [
{"id":1, "name":"one", "zim":"planet", "gir":"earth"},
{"id":2, "name":"two", "zim":"planet", "gir":"mars"}
]
}
然而,我的<代码>User和Item模式的属性大于这些属性。 我找到了做到这一点的途径,但beware,这并不好。 请帮助......
Update
下一节载有原始问题。 最后一节显示了新的解决办法。
My hacks
home_controller.rb
class HomeController < ApplicationController
def observe
respond_to do |format|
format.js { render :json => Observation.new(current_user, @items).to_json }
end
end
end
observation.rb
# NOTE: this is not a subclass of ActiveRecord::Base
# this class just serves as a container to aggregate all "observable" objects
class Observation
attr_accessor :user, :items
def initialize(user, items)
self.user = user
self.items = items
end
# The JSON needs to be decoded before it s sent to the `to_json` method in the home_controller otherwise the JSON will be escaped...
# What a mess!
def to_json
{
:user => ActiveSupport::JSON.decode(user.to_json(:only => :username, :methods => [:foo, :bar])),
:items => ActiveSupport::JSON.decode(auctions.to_json(:only => [:id, :name], :methods => [:zim, :gir]))
}
end
end
Look Ma! No more hacks!
Override as_json instead
ActiveRecord:Serialization#as_json 很粗略。 概述:
as_json(options = nil)
[show source]
关于<代码>to_json <>/code> vs as_json 的更多信息,见的公认答复。 2.3.5
The code sans hacks
user.rb
class User < ActiveRecord::Base
def as_json(options)
options = { :only => [:username], :methods => [:foo, :bar] }.merge(options)
super(options)
end
end
item.rb
class Item < ActiveRecord::Base
def as_json(options)
options = { :only => [:id, name], :methods => [:zim, :gir] }.merge(options)
super(options)
end
end
home_controller.rb
class HomeController < ApplicationController
def observe
@items = Items.find(...)
respond_to do |format|
format.js do
render :json => {
:user => current_user || {},
:items => @items
}
end
end
end
end