Rails - json.erb 模板

发布于 2024-10-25 05:17:39 字数 789 浏览 1 评论 0原文

我一直在尝试找出一种使用特殊字段、自定义格式等自定义 JSON 的方法。我在模型中创建了一个 as_json 和 to_xml 方法来制定我需要的对象。这很有效，但很草率，因为我的一些辅助方法必须转移到模型中，因为我需要辅助程序和模型中的格式。我还认为这是草率的代码并使模型失控。

我已经能够获得 json.erb 工作的格式，但也不认为它工作 100% 正确，并且回调也不会附加。任何人都能做到这一点

这是我到目前为止所得到的。

api 调用 format.json

模板称为 items.json.erb

<% @items.each do |item| %>
<%= { :item => { :id => item.id, :name => item.name }.to_json.html_safe  %>
<% end %>

这有效但看起来很奇怪。有人有建议或有办法做到这一点吗？

顺便说一句，这样做是为了回调工作

<%= params[:callback]+"(" if params[:callback]  %>
<% @items.each do |item| %>
    <%= { :item => { :id => item.id, :name => item.name }.to_json.html_safe  %>
<% end %>
<%= ")" if params[:callback]  %>

原文

I have been trying to figure out a way to customize JSON with special fields, custom formats, etc etc. I have created an as_json and to_xml method in my model to formulate the object how I need. This works well but it is sloppy because some of my helper methods had to move into the model, because I need the formats in the helpers and model. I also think it is sloppy code and makes the model out of control.

I have been able to get a format with json.erb working but don't think it is working 100% correct either and the callback doesn't append either. Anyone get this working

Here is what I got so far.

api calls format.json

template called is items.json.erb

<% @items.each do |item| %>
<%= { :item => { :id => item.id, :name => item.name }.to_json.html_safe  %>
<% end %>

This works but seems odd. Anyone have suggestions or have a way to do this?

btw did this for the callback to work

<%= params[:callback]+"(" if params[:callback]  %>
<% @items.each do |item| %>
    <%= { :item => { :id => item.id, :name => item.name }.to_json.html_safe  %>
<% end %>
<%= ")" if params[:callback]  %>

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阪姬 2024-11-01 05:17:39

我认为最好的方法是跳过 erb 模板（如果出于某种原因您并不绝对需要）。然后你可以这样做：

items = Item.all
render :json => items.to_json(:only => [:id, :name]), :callback => params[:callback]

你可以重写模型中的 to_json 方法来添加字段或调用方法。

I think the best way to do this would be to skip the erb template if you don't absolutely need if for some reason. Then you could do something like this:

items = Item.all
render :json => items.to_json(:only => [:id, :name]), :callback => params[:callback]

You can override the to_json method in your model to add fields or call methods.

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海的爱人是光 2024-11-01 05:17:39

根据您对 Polarblau 的回答，您应该重写 as_json 方法并使用 :methods 参数将方法结果包含在 json 中

class Item

  def date
    return "1 year and 8 months" #obviously use logic here
  end

  def as_json(args={})
    super(:methods=>[:date], :only=>[:id=>:name])
  end
end

Based on your answer to polarblau, you should override the as_json method and use the :methods parameter to include method results in your json

class Item

  def date
    return "1 year and 8 months" #obviously use logic here
  end

  def as_json(args={})
    super(:methods=>[:date], :only=>[:id=>:name])
  end
end

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奢华的一滴泪 2024-11-01 05:17:39

最有可能的是，您会想要：

使用自定义查找器 sql 来更改列名称/执行计算（它比 Ruby 快得多）：
MyModel.select('col_name_that_needs_renamed AS new_name').order('some_col DESC')
或更复杂的示例：
MyModel.find_by_sql('SELECT col_name_that_needs_renamed AS new_name, foo_col*50 AS math WHERE foo=bar ORDER some_col LIMIT 8')
如果有些事情你在 SQL 中无法做到（或无法弄清楚），你可以 必须恢复到 Ruby（尽管不推荐，因为它速度明显慢）
to_json 的 API Dock