Hi people,
i'm new to rails and have difficulties in actively using the model
relationships.
I'm building an onlinestore with rails 4.2.4 following the book agile
development with rails 4.
The asignment is to create a migration that copies the product price to the
line item.
Class Product < ActiveRecord::Base
has_many :line_items
Class LineItem < ActiveRecord::Base (is a jointable between product and
cart)
belongs_to :product
My question is how do i instruct rails to copy an attribute from one model
to the other (in this case product.price to line_item.price)
I understand that the belongs_to and has_many methods bring in new methods
when called.
e.g
@line_item = @product.line_items
I somehow can't make pratical use of this knowledge!! What really confuses
me is these are instance_variable
of the models but when it comes to use the author has been using the
tablenames
eg :line_items, :products etc how i'm i supposed to copy the
attribute_price from product using instance_variables?
My migration for the new added price column to LineItem model
class AddPriceToLineItem < ActiveRecord::Migration
def up
add_column :line_items, :price, :decimal, precision: 8, scale: 2
end
end
If the question is not clear just let me whats confusing.
Thanks for help
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