Thanks John!
On Friday, May 4, 2012 7:48:34 AM UTC-3, Jon Leighton wrote:
>
> There has been discussion about putting a new syntax into Rails 4 that
> more closely resembles scopes. Example:
>
> has_many :comments, -> { where(deleted: false).order(:created_at) }
>
> This would solve the problem of eager evaluation because it's contained
> in a lambda.
>
> I'll be looking into this when I get around to it.
>
> On 03/05/12 19:28, Gabriel Sobrinho wrote:
> > Take a look (not my production code but reproduces the desired
> behavior):
> >
> > ``` ruby
> > class Post < ActiveRecord::Base
> > attr_accessible :published_at, :name
> >
> > has_and_belongs_to_many :categories, :order => lambda {
> > [Category.arel_table[:published_at].desc, Category.arel_table[:name]] }
> > end
> > ```
> >
> > ``` ruby
> > class Category < ActiveRecord::Base
> > attr_accessible :published_at, :name
> >
> > has_and_belongs_to_many :posts, :order => lambda {
> > [Post.arel_table[:published_at].desc, Post.arel_table[:name]] }
> > end
> > ```
> >
> > ``` ruby
> > Category.first.posts
> > # => TypeError: Cannot visit Proc
> > ```
> >
> > ``` ruby
> > Post.first.categories
> > # => TypeError: Cannot visit Proc
> > ```
> >
> > The problem happens when we have a cross reference between two models
> > and need to use arel due to difference on quote of columns.
> >
> > Sounds reasonable?
> >
> > Reference: https://github.com/rails/rails/issues/6146
> >
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> --
> http://jonathanleighton.com/
>
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