Create action always creates two identical table entries instead of one - ruby-on-rails

Question

I have a create action in my ProductsController (the params come from a form in my view):
def create
vendor = #current_vendor
product = Product.create(:name => params[:product][:name])
vendor.products << product
vendor.belongings.create(:product_id => product.id, :count => params[:belonging][:count], :detail => params[:belonging][:detail])
if vendor.save
flash[:notice] = "Produkt hinzugefügt!"
redirect_back_or_default root_url
else
render :action => :new
end
end
It creates a variable "vendor", which stores the currently logged-in vendor (Authlogic)
A new Product is created (the product name is from the input field in the form) and stored in the variable "product"
The "product" is being connected to the current vendor
In the belongings table, additional informations to the product are being stored
it saves the whole thing
It's a many-to-many relationship throught the belongings table.
My problem is, the create action always creates the product twice!
Thanks for your help! :)
My console log when I create a new object through my form is:
Started POST "/products" for 127.0.0.1 at 2013-09-15 20:40:26 +0200
Processing by ProductsController#create as HTML
Parameters: {"utf8"=>"✓", "authenticity_token"=>"lNk/qQMP0xhlCuGgHtU+d5NEvIlCFcPSKB0FxDZH0zY=", "product"=>{"name"=>"Erdbeeren"}, "belonging"=>{"count"=>"20", "detail"=>"Rot"}, "commit"=>"Create"}
DEPRECATION WARNING: ActiveRecord::Base#with_scope and #with_exclusive_scope are deprecated. Please use ActiveRecord::Relation#scoping instead. (You can use #merge to merge multiple scopes together.). (called from current_vendor_session at /Users/reto_gian/Desktop/dici/app/controllers/application_controller.rb:11)
Vendor Load (0.3ms) SELECT "vendors".* FROM "vendors" WHERE "vendors"."persistence_token" = '04f75db0e2ef108ddb0ae1be1da167536d47b4d79c60ecb443ad2ea5717ecd752388e581f9379746568c72372be4f08585aa5581915b1be64dc412cded73a705' LIMIT 1
(0.1ms) begin transaction
SQL (0.8ms) INSERT INTO "products" ("created_at", "name", "updated_at") VALUES (?, ?, ?) [["created_at", Sun, 15 Sep 2013 18:40:26 UTC +00:00], ["name", "Erdbeeren"], ["updated_at", Sun, 15 Sep 2013 18:40:26 UTC +00:00]]
(0.8ms) commit transaction
(0.1ms) begin transaction
SQL (0.6ms) INSERT INTO "belongings" ("created_at", "product_id", "updated_at", "vendor_id") VALUES (?, ?, ?, ?) [["created_at", Sun, 15 Sep 2013 18:40:26 UTC +00:00], ["product_id", 7], ["updated_at", Sun, 15 Sep 2013 18:40:26 UTC +00:00], ["vendor_id", 1]]
(0.9ms) commit transaction
(0.1ms) begin transaction
SQL (0.6ms) INSERT INTO "belongings" ("count", "created_at", "detail", "product_id", "updated_at", "vendor_id") VALUES (?, ?, ?, ?, ?, ?) [["count", "20"], ["created_at", Sun, 15 Sep 2013 18:40:26 UTC +00:00], ["detail", "Rot"], ["product_id", 7], ["updated_at", Sun, 15 Sep 2013 18:40:26 UTC +00:00], ["vendor_id", 1]]
(0.9ms) commit transaction
Redirected to http://localhost:3000/
Completed 302 Found in 30ms (ActiveRecord: 5.1ms)

Answer 1

I think the problem could be in the line
vendor.products << product
this is adding the variable product (which is Product.create(:name => params[:product][:name]) to vendor.products a second time - which is unnecessary and likely the source of your problem