On May 24, 2011, at 6:06 AM, Wael Nasreddine wrote:
Hello,
I'm a web developer comping from Zend Framework and I'm trying to
learn
Rails the right way and avoid Bad Practice from the start.
I have a few questions in my head that I'm unable to get answered on
my
own, so I'm going to try and get it explained with an example.
Let's say I'm building a site for a restaurant and the website have a
Menu model (which is essentially categories, like Pizza, Burgers
etc..),
a Product model that belongs to the menu and an Ingredient model which
belongs to Product, code:
class Menu < ActiveRecord::Base
has_many :products
# … validations and other logic
end
class Product < ActiveRecord::Base
belongs_to :menu
has_many :ingredients
accepts_nested_attributes_for :ingredients
# … validations and other logic
end
class Ingredient < ActiveRecord::Base
belongs_to :product
validates :name, :presence => true, :unique => true
# … other validations and other logic.
end
So far so good, however now I'm stuck because I'm not sure how to code
what I have in mind without ending up with a spaghetti code. In the
new
product form, I would like the user to be able to add ingredients (
accepts_nested_attributes_for already there so I should be good for
having the fields in the form ) but when the form has been filled and
submitted, I want to create an ingredient if and only if it does not
already exists, if on the other hand, it does, in this case the
association should happen on the one that already exists, for example:
Let's say that I already have :onion in the ingredients table, if I
added a new product that has onion, I should not have two rows for the
:onion ingredient (should not happen since I added a validation), but
instead the association should happen on the one that already exists..
This is a great place to look at find_or_create_by_[your attribute
here]. I might try
@ingredient = Ingredient.find_or_create_by_name params[:ingredient]
[:name]
@product.igredients << @ingredient
Not sure about the params part, but the rest should work.
Walter
How can I accomplish that? Should I be using a before_create hook?
What
should I do in that hook? or should I create a custom create method?
Thank you.
Wael
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