Add “previously followed” dossiers and gestionnaires

Using an “inactive” Follow scope, similar to the “active” scope.

(I was tempted to use a default_scope, but this breaks when trying to `unscope` it in associations.)

app/models/dossier.rb

@@ -27,7 +27,9 @@ class Dossier < ApplicationRecord
   has_many :commentaires, dependent: :destroy
   has_many :invites, dependent: :destroy
   has_many :follows, -> { active }
+  has_many :previous_follows, -> { inactive }, class_name: 'Follow'
   has_many :followers_gestionnaires, through: :follows, source: :gestionnaire
+  has_many :previous_followers_gestionnaires, -> { distinct }, through: :previous_follows, source: :gestionnaire
   has_many :avis, dependent: :destroy
 
   has_many :dossier_operation_logs, dependent: :destroy

app/models/follow.rb

@@ -7,6 +7,7 @@ class Follow < ApplicationRecord
   before_create :set_default_date
 
   scope :active, -> { where(unfollowed_at: nil) }
+  scope :inactive, -> { where.not(unfollowed_at: nil) }
 
   private
 

app/models/gestionnaire.rb

@@ -17,7 +17,9 @@ class Gestionnaire < ApplicationRecord
 
   has_many :dossiers, -> { state_not_brouillon }, through: :procedures
   has_many :follows, -> { active }
+  has_many :previous_follows, -> { inactive }, class_name: 'Follow'
   has_many :followed_dossiers, through: :follows, source: :dossier
+  has_many :previously_followed_dossiers, -> { distinct }, through: :previous_follows, source: :dossier
   has_many :avis
   has_many :dossiers_from_avis, through: :avis, source: :dossier
   has_many :trusted_device_tokens

spec/models/gestionnaire_spec.rb

@@ -67,6 +67,7 @@ describe Gestionnaire, type: :model do
       end
 
       it { expect(gestionnaire.follow?(already_followed_dossier)).to be false }
+      it { expect(gestionnaire.previously_followed_dossiers).to include(already_followed_dossier) }
     end
   end