Why does Rails complain about respond_to do |format|?

Question

Ruby on Rails

Welcome all.

def from_department
    @selected = Employee.where(:department_id => params[:department_id])
    respond_to do |format|
        format.js
    end
end

An error appears ActionController:: UnknownFormat
In config/initializers/mime_types.rbadded a line What could be the reason? Mime::Type.register "application/javascript", :js

Answer 1

The reason is that you are sending a request not in js format