Referencing Model with String input

Question

Lets say I wish to make a page that can query the desired object with type(string) and id(int).

/query?type=people&id=1

would fetch me

Person.find(1)

whereas

/query?type=cities&id=123

would fetch me

City.find(123)

However, I have problems as to how to translate strings into the desired model class.

The only way I can think of is

case params[:type]
 when 'people'
  @object = Person.find(params[:id])
 when 'cities'
  @object = City.find(params[:id])
end

However, this method will be quite problematic if I have more types of models.

Is there a better way?

Thank you in advance,

Answer 1

Try:

klass = params[:type]
klass.singularize.classify.constantize.find(params[:id])

Edit:

@object = params[:type].singularize.classify.constantize.find(params[:id])