Why is Model Creation not Working - ruby-on-rails-3

Question

I'm trying to create a transaction log once a product is saved in my product controller. For some reason I'm getting an error when I try to save the transaction log. The product is being saved successfully.
Code:
def create
#product = Product.new(params[:product])
respond_to do |format|
if #product.save
ProductTransaction.create(
:product_id => #product.id,
:user_id => current_user.id,
:message => "Product created"
)
format.html {
redirect_to product_path(#product.id),
:flash => { :success => "Product was successfully created." }
}
else
format.html { render action: "new" }
end
end
end
Error:
PGError: ERROR: column "product_id" is of type integer but expression is of type character varying at character 117
HINT: You will need to rewrite or cast the expression.
: INSERT INTO "product_transactions" ("created_at", "message", "product_id", "updated_at", "user_id") VALUES ($1, $2, $3, $4, $5) RETURNING "id"
I don't understand the error above. I've double check my tables and the product_id is an integer. Also, I tried hard coding a number to see if I could just get it to save. That didn't work. I then removed all the parameters from the create function and still I got the same error. I even recreated the table from scratch and same result. ProductTransaction has no validation requirements. What am I doing wrong?
Code (Parameters removed):
def create
#product = Product.new(params[:product])
respond_to do |format|
if #product.save
ProductTransaction.create()
format.html {
redirect_to product_path(#product.id),
:flash => { :success => "Product was successfully created." }
}
else
format.html { render action: "new" }
end
end
end
Product Schema:
Product(id:integer, name:string, etc.)
Product Transaction Schema:
ProductTransaction(id:integer, user_id:integer, product_id:integer, message:integer)

Answer 1

Found my problem. I had to refresh my app for whatever reason.
ran the following and it worked:
touch tmp/restart.txt
Now if I could only get those two hours of my life back. :-)