CODEWITHSUNDEEP
ruby-on-railscollections
ajbraus
ajbraus

Reputation: 2999

collection_select not saving/erroring

I'm trying to create a new course create form with a drop down to select a teach from the teacher's table.

When I put the below in my new course form view I get this error:

You have a nil object when you didn't expect it!

<%= collection_select(:Teacher, :id, @teachers, :id, :name, options = {:prompt => "Select a Teacher"}) %>

if I put

<%= collection_select(:Teacher, :id, Teacher.find(:all), :id, :name, options = {:prompt => "Select a Teacher"}) %>

it creates the form with the correct drop down info but then it won't save.

My course controller create method looks like this

 def create
@course = Course.new(params[:course])

respond_to do |format|
  if @course.save
    format.html { redirect_to(@course, :notice => 'Course was successfully created.') }
    format.xml  { render :xml => @course, :status => :created, :location => @course }
  else
    format.html { render :action => "new" }
    format.xml  { render :xml => @course.errors, :status => :unprocessable_entity }
  end

Upvotes: 0

Views: 571

Answers (1)

cristian
cristian

Reputation: 8744

Rewrite new action like this



    def new
         @course = Course.new
         @teachers = Teachers.all

         respond_to do |format|
           format.html # new.html.erb
           format.xml  { render :xml => @course }
         end
      end

After that 

<%= collection_select(:Teacher, :id, @teachers, :id, :name, options = {:prompt => "Select a Teacher"}) %>

should work

Upvotes: 2

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