ActiveRecords数组到JSON [英] Array of ActiveRecords to JSON

问题描述

我知道ActiveRecord提供了to_json方法，该方法允许使用:only和:except从JSON输出中过滤出字段.

I am aware that ActiveRecord provides a to_json method which allows fields to be filtered out of the JSON output using :only and :except.

目前，我正在使用以下格式将查找结果中的数组格式化为JSON:

At present I am using the following to format an array from a find as JSON:

@customers = Customer.find(:all)
...
format.js { render :json => @customers}

我如何能够选择要在数组对象中输出的字段?有快捷方式还是我需要手工完成?

How would I be able to select the fields to be output in the objects in the array? Is there a shortcut or do I need to do this by hand?

干杯， 亚当

推荐答案

如果要全局应用模型更改，则可以覆盖模型类的to_json方法.

You can overwrite the to_json method of the model class if you want to globally apply the change for the model.

例如，要从呈现的JSON中排除空值，您可以将原始ActiveRecord方法覆盖为_json

For example, to exclude null values from the rendered JSON you could overwrite the original ActiveRecord method to_json

  def to_json(options)
    hash = Serializer.new(self, options).serializable_record
    hash = { self.class.model_name => hash } if include_root_in_json
    ActiveSupport::JSON.encode(hash)
  end

在您的模型课程中使用它:

with this in your model class:

  def to_json(options)
    hash = Serializer.new(self, options).serializable_record.reject {|key, value| value.nil? }
    hash = { self.class.model_name => hash } if include_root_in_json
    ActiveSupport::JSON.encode(hash)
  end

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