Love the idea! It clearly separates the concerns of the two models.
One thing though, would it be interesting for the scope to take and array of scopes? On May 21, 2013, at 11:41 PM, Caleb Thompson <[email protected]> wrote: > I'm considering implementing a feature by which a collection > association might limit the results. > > By default, a collection association returns all values where the > foreign key on the `belongs_to` or `has_and_belongs_to` model matches > the parent object's primary key. These results can be filtered using the > `conditions` option, but that requires that other models have knowledge > of the parent model's table structure. > > The feature I'm proposing is to add a `scope` option to collection > associations which takes a symbol representing a scope (or class mehtod) > defined on the associated model class. > > A basic example would look like this: > > class Comment > belongs_to :post > > def self.visible > where(deleted_at: nil) > end > end > > class Post > has_many :posts, scope: :visible > end > > In the above example, `post.comments` would return `Comment` instances > whose `post_id = post.id` and whose `deleted_at = NULL`, providing basic > soft-deletion functionality. > > While the same effect could be achieved with a declaration such as > `has_many :posts, conditions: ['deleted_at = ?', nil]`, that betrays > knowledge of the implementation of deletion on `Post` and would break if > the implementation were changed to a boolean value for deletion rather > than a timestamp field. > > If I were to work on adding this functionality into ActiveRecord, is it > something that core might entertain merging? > > Thank you, > > Caleb Thompson > > > -- > You received this message because you are subscribed to the Google Groups > "Ruby on Rails: Core" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > Visit this group at http://groups.google.com/group/rubyonrails-core?hl=en. > For more options, visit https://groups.google.com/groups/opt_out. > > Cumprimentos, Luís Ferreira -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Core" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/rubyonrails-core?hl=en. For more options, visit https://groups.google.com/groups/opt_out.
