我用祖先树成目标树。我想使用json将那棵树的内容发送到浏览器。
我的 Controller 是这样的:
@goals = Goal.arrange
respond_to do |format|
format.html # index.html.erb
format.xml { render :xml => @goals }
format.json { render :json => @goals}
end
当我打开json文件时,得到以下输出:
{"#<Goal:0x7f8664332088>":{"#<Goal:0x7f86643313b8>":{"#<Goal:0x7f8664331048>":{"#<Goal:0x7f8664330c10>":{}},"#<Goal:0x7f8664330e68>":{}},"#<Goal:0x7f86643311b0>":{}},"#<Goal:0x7f8664331f70>":{},"#<Goal:0x7f8664331d18>":{},"#<Goal:0x7f8664331bd8>":{},"#<Goal:0x7f8664331a20>":{},"#<Goal:0x7f86643318e0>":{},"#<Goal:0x7f8664331750>":{},"#<Goal:0x7f8664331548>":{"#<Goal:0x7f8664330aa8>":{}}}
如何在json文件中呈现目标对象的内容?
我已经试过了:
@goals.map! {|goal| {:id => goal.id.to_s}
但这不起作用,因为@goals是有序哈希。
最佳答案
我在https://github.com/stefankroes/ancestry/issues/82上从tejo用户那里得到了一些帮助。
解决方案是将此方法放入目标模型:
def self.json_tree(nodes)
nodes.map do |node, sub_nodes|
{:name => node.name, :id => node.id, :children => Goal.json_tree(sub_nodes).compact}
end
end
然后使 Controller 看起来像这样:
@goals = Goal.arrange
respond_to do |format|
format.html # index.html.erb
format.xml { render :xml => @goals }
format.json { render :json => Goal.json_tree(@goals)}
end
关于ruby-on-rails-3 - 如何从祖先生成json树,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/9944005/