Ruby on Rails

On 25 April 2014 08:59, ngollan@googlemail.com <ngollan@gmail.com> wrote:
> On Thursday, April 24, 2014 5:35:08 PM UTC+2, Colin Law wrote:
>>
>> For those of us with less knowledge of how the internals of rails
>> works could you provide a simple example of what you are attempting to
>> achieve with dynamic class name in a association?
>
>
> I can't speak for the OP, but in my case I needed something like:

Since you did not quote a previous message then the assumption is that
you are the OP.

>
> class Report < ActiveRecord::Base
> has_many :reports_subjects
> has_many :subjects, through: :reports_subjects, class_name: ->(report) {
> report.subjects_type }
>
> def subjects_type
> # divine required subject model class somehow
> end
> end
>
> Of course, that won't fly since the class_name is evaluated purely as a
> string deep down in the reflection and at that point, all knowledge of the
> specific instances involved in an association has been discarded.

What I don't understand is why you would want to do that.

Colin

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