First off, I am not using Rails. I am using Sinatra for this project with Active Record. 

I want to be able to override either to\_json or as\_json on my Model class and have it define some 'default' options. For example I have the following:

```
class Vendor < ActiveRecord::Base
  def to_json(options = {})
    if options.empty?
      super :only => [:id, :name]
    else
      super options
    end
  end
end

```

where Vendor has more attributes than just id and name. In my route I have something like the following:

```
@vendors = Vendor.where({})
@vendors.to_json

```

Here `@vendors` is an Array vendor objects (obviously). The returned json is, however, not invoking my `to_json` method and is returning all of the models attributes. 

I don't really have the option of modifying the route because I am actually using a modified sinatra-rest gem (http://github.com/mikeycgto/sinatra-rest). 

Any ideas on how to achieve this functionality? I could do something like the following in my sinatra-rest gem but this seems silly:

```
@PLURAL.collect! { |obj| obj.to_json }

```