onyxblade / associationist Goto Github PK
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A gem to define virtual associations on Rails models
For example,
class Order < ApplicationRecord
include Associationist::Mixin.new(
name: :products,
scope: -> {}
)
# this not working at least when using postgres
has_many :stocks, through: :products
end
Need to support this usage.
Since a virtual association does not involve actual relations among tables, and eager_load
makes use of join, it cannot be eager_load
ed.
Raise when eager_load
is triggered. This can be achieved by overriding the check_eager_loadable!
on Reflection.
Firstly ❤️ the idea of this Gem, it's perfect for a need I came across today and a really nice implementation.
On Rails 7.0.4 I've defined the following in my model:
include Associationist::Mixin.new(
name: :surfaced_values,
scope: lambda() { |entry|
Properties::Value.joins(:property).where(value_ownable: entry).merge(Property.surfaced)
},
type: :collection
)
If I do Entry.last.surfaced_values
it works as expected.
However if I do Entry.includes(:surfaced_values).last
I get this error:
Rails couldn't find a valid model for SurfacedValue association. Please provide the :class_name option on the association declaration. If :class_name is already provided, make sure it's an ActiveRecord::Base subclass.
If I add class_name: 'Properties::Value'
it gives me the same error.
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