Searching in MongoID using a variable as key

Question

I am using Mongoid in a Rails application. Let's said there is a model called Product. Each product document have some fields that the other document don't have. Here are 2 examples.

{name: "Product A", color: "Yellow", discount: "0.9"}
{name: "Product B", color: "Blue", size: "XXL"}

The field discount or size may changed from time to time. Assumed I have a form that let users to search by the field name (i.e. discount) and value. How can I pass the variable that contains the field name to a Mongoid Criteria?

Thanks.

Answer 1

@return_value = Model.where("field_name"=>"value").all

For your problem use

@value = Product.where("discount" => ".0.9").all