Rails: What is the best way to display an index with a specific list of records specified through an array of IDs?

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**Background**

I am trying to create links that redirect to an index page listing an arbitrary set of records. I believe that the best way to accomplish this is to pass an array of the IDs of the objects that I would like to be included to the index controller method. 

**Method**

I have a working solution where I look for params[:ids] in my index method and if it exists, I find those records and display them. If that params[:ids] doesn't exists, I default to the default index behavior. 

**Problem**

However, since I am using GET, the array of IDs is getting included in the URI and with larger sets of IDs, I am getting the following error:

    Request-URI Too Large

I think the natural way to get around this is to use POST. I can either add a post route for the index method or I can add a new POST route to a new controller method which looks up the records and then renders or redirects the results to the index action. 

**Questions**

 - Am I going about this in the best way? Do you know of a better way?
 - Do you recommend using a new method that redirects to index or adding a POST route for the index?
 - Can you point me towards a code sample where something similar is being done?