Ruby on Rails

On 31 January 2013 13:55, Jim Ruther Nill <jvnill@gmail.com> wrote:
>
>
>
> On Thu, Jan 31, 2013 at 9:52 PM, Fabian Peter <lists@ruby-forum.com> wrote:
>>
>> Hello,
>>
>> I'm trying to join 2 tables with ruby on rails 3.2.
>>
>> rails generate model product name:string
>> rails generate model price product_id:integer price:integer
>> date:datetime
>>
>> product.rb:
>> class Product < ActiveRecord::Base
>> has_many :prices
>> end
>>
>> price.rb:
>> class Price < ActiveRecord::Base
>> belongs_to :product
>> end
>>
>> What is the most efficient way to get all products including the latest
>> price into the View.
>>
>> Some tries didnt work for this:
>>
>> @test = Product.includes(:prices).all
>> I didnt find anything about the prices in @test.
>
>
> @test contains an array of products. to get the prices, try
>
> @test.each do |product|
> product.prices.each do |price|
> p price.price
> end
> end

But you don't need .includes,
@test = Product.all
will work fine (though I would prefer @products =Product.all since
that is what they are).

If you inspect @test you will not see the prices, but as soon as you
ask for the prices it will fetch them. Such is the magic or Rails.

I am sure readers here are bored with me suggesting to beginners that
they work right through a good tutorial such as railstutorial.org,
which is free to use online, but it is definitely a good idea as it
would give you a good introduction to the basics of rails. Also look
through the Rails Guides.

For some reason I am rarely thanked for offering this advice. :(

Colin

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