Hey,
I'm having trouble understanding how to correctly build and save an object
that has a has_many relationship. I am trying to map Products to Categories
through CategoryAssignments:
Model:
class Product < ActiveRecord::Base
> has_many :category_assignments
> ...
> end
>
> class Category < ActiveRecord::Base
> has_many :category_assignments
> end
>
> class CategoryAssignment < ActiveRecord::Base
> belongs_to :category
> belongs_to :product
> end
I generated a scaffold for Products and in it I changed the view for "new"
to add a select box of categories. The idea is that when you are creating a
product, you can also pick what categories it belongs to.
<p>
> <%= f.label :category_assignments %><br />
> <%= collection_select(:category_assignment, :category_id, @categories,
> :id, :name, options ={:prompt => true}, html_options ={:multiple => true,
> :size => 6}) %>
> </p>
>
My issue is in the controller. Specifically, for "create", I am having
trouble building the CategoryAssignments correctly. Here is what I have
(it's not working).
# GET /products/new
> # GET /products/new.xml
> def new
> @product = Product.new
> @categories = Category.find(:all)
>
> respond_to do |format|
> format.html # new.html.erb
> format.xml { render :xml => @product }
> end
> end
>
> # POST /products
> # POST /products.xml
> def create
> @product = Product.new(params[:product])
> logger.info("New Product looks like #{params[:product]}\n");
> logger.info("New Category Assignment looks like
> #{params[:category_assignment]}\n");
>
> respond_to do |format|
> if @product.save #and @category_assignment.each {
> |category_assignment| category_assignment.save }
> @category_assignments =
> @product.category_assignments.build(params[:category_assignment])
> @category_assignments.save
> logger.info("Category Assignment ARRAY ==
> @category_assignments\n");
>
> flash[:notice] = 'Product was successfully created.'
> format.html { redirect_to(@product) }
> format.xml { render :xml => @product, :status => :created,
> :location => @product }
> else
> format.html { render :action => "new" }
> format.xml { render :xml => [[email protected],
> @category_assignment.errors], :status => :unprocessable_entity }
> end
> end
> end
Can someone give me some advice on the correct way of building
CategoryAssignments?
Thanks!
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