Hi,
What is the easiest way to implement soft-deletes on has_many through
association?
What I want is something like this:
class Company > ActiveRecord::Base
has_many :staffings
has_many :users, through: :staffings, conditions: {staffings: {active: true}}
end
I want to use Company#users the following way:
the Company#users should be a normal association so that it works with forms.
when adding a new user, a new Staffing with active: true is created.
when removing a user, the existing Staffing is updated active: false (currently
it just get deleted).
when adding a previously removed user (so that Staffing#active == false) the
Staffing is updated to active: true.
I thought about overriding the Company#users= method, but it really isn't good
enough since there are other ways of updating the associations.
What is the Rails Way of doing this sort of thing?
(I asked it at SO too -
http://stackoverflow.com/questions/10441633/soft-delete-on-has-many-through-association)
What I came up with so far is:
- override user= and user_ids
- deny the use of any other association modifier methods:
But all that feels really, really dirty.
has_many :developments, through: :development_participations,
conditions: {development_participations: {allowed: true}} do |a|
%w{<< delete clear build create}.each do |association_method|
# Disable assoc modifier methods for now
#
http://api.rubyonrails.org/classes/ActiveRecord/Associations/ClassMethods.html#method-i-has_many
define_method(association_method) do |*args|
raise 'nah, not yet supported. Use `developments=` instead.'
end
end
end
def users=(others)
self.development_ids = others.collect &:id
end
def development_ids=(other_ids)
# All the merging magic here
end
Any thought?
Cheers,
Dmytrii
http://ApproachE.com
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