Fix some old migration scripts (#17394)

* Fix some old migration scripts

* Fix edge case in two-step migration from older releases

5 files changed, 53 insertions, 4 deletions

diff --git a/db/migrate/20181026034033_remove_faux_remote_account_duplicates.rb b/db/migrate/20181026034033_remove_faux_remote_account_duplicates.rb
index bd4f4c2a3..40537e9c9 100644
--- a/db/migrate/20181026034033_remove_faux_remote_account_duplicates.rb
+++ b/db/migrate/20181026034033_remove_faux_remote_account_duplicates.rb
@@ -1,6 +1,46 @@
 class RemoveFauxRemoteAccountDuplicates < ActiveRecord::Migration[5.2]
   disable_ddl_transaction!
 
+  class StreamEntry < ApplicationRecord
+    # Dummy class, to make migration possible across version changes
+    belongs_to :account, inverse_of: :stream_entries
+  end
+
+  class Status < ApplicationRecord
+    # Dummy class, to make migration possible across version changes
+    belongs_to :account, inverse_of: :statuses
+    has_many :favourites, inverse_of: :status, dependent: :destroy
+    has_many :mentions, dependent: :destroy, inverse_of: :status
+  end
+
+  class Favourite < ApplicationRecord
+    # Dummy class, to make migration possible across version changes
+    belongs_to :account, inverse_of: :favourites
+    belongs_to :status,  inverse_of: :favourites
+  end
+
+  class Mention < ApplicationRecord
+    # Dummy class, to make migration possible across version changes
+    belongs_to :account, inverse_of: :mentions
+    belongs_to :status
+  end
+
+  class Notification < ApplicationRecord
+    # Dummy class, to make migration possible across version changes
+    belongs_to :account, optional: true
+    belongs_to :from_account, class_name: 'Account', optional: true
+    belongs_to :activity, polymorphic: true, optional: true
+  end
+
+  class Account < ApplicationRecord
+    # Dummy class, to make migration possible across version changes
+    has_many :stream_entries, inverse_of: :account, dependent: :destroy
+    has_many :statuses, inverse_of: :account, dependent: :destroy
+    has_many :favourites, inverse_of: :account, dependent: :destroy
+    has_many :mentions, inverse_of: :account, dependent: :destroy
+    has_many :notifications, inverse_of: :account, dependent: :destroy
+  end
+
   def up
     local_domain = Rails.configuration.x.local_domain
 
diff --git a/db/migrate/20190715164535_add_instance_actor.rb b/db/migrate/20190715164535_add_instance_actor.rb
index a26d54949..8c0301d69 100644
--- a/db/migrate/20190715164535_add_instance_actor.rb
+++ b/db/migrate/20190715164535_add_instance_actor.rb
@@ -1,4 +1,9 @@
 class AddInstanceActor < ActiveRecord::Migration[5.2]
+  class Account < ApplicationRecord
+    # Dummy class, to make migration possible across version changes
+    validates :username, uniqueness: { scope: :domain, case_sensitive: false }
+  end
+
   def up
     Account.create!(id: -99, actor_type: 'Application', locked: true, username: Rails.configuration.x.local_domain)
   end
diff --git a/db/migrate/20191007013357_update_pt_locales.rb b/db/migrate/20191007013357_update_pt_locales.rb
index b7288d38a..9e8f8b424 100644
--- a/db/migrate/20191007013357_update_pt_locales.rb
+++ b/db/migrate/20191007013357_update_pt_locales.rb
@@ -1,4 +1,8 @@
 class UpdatePtLocales < ActiveRecord::Migration[5.2]
+  class User < ApplicationRecord
+    # Dummy class, to make migration possible across version changes
+  end
+
   disable_ddl_transaction!
 
   def up
diff --git a/db/views/follow_recommendations_v01.sql b/db/views/follow_recommendations_v01.sql
index 799abeaee..8295bbc0f 100644
--- a/db/views/follow_recommendations_v01.sql
+++ b/db/views/follow_recommendations_v01.sql
@@ -20,7 +20,7 @@ FROM (
   HAVING count(follows.id) >= 5
   UNION ALL
   SELECT accounts.id AS account_id,
-         sum(reblogs_count + favourites_count) / (1.0 + sum(reblogs_count + favourites_count)) AS rank,
+         sum(status_stats.reblogs_count + status_stats.favourites_count) / (1.0 + sum(status_stats.reblogs_count + status_stats.favourites_count)) AS rank,
          'most_interactions' AS reason
   FROM status_stats
   INNER JOIN statuses ON statuses.id = status_stats.status_id
@@ -32,7 +32,7 @@ FROM (
     AND accounts.locked = 'f'
     AND accounts.discoverable = 't'
   GROUP BY accounts.id
-  HAVING sum(reblogs_count + favourites_count) >= 5
+  HAVING sum(status_stats.reblogs_count + status_stats.favourites_count) >= 5
 ) t0
 GROUP BY account_id
 ORDER BY rank DESC
diff --git a/db/views/follow_recommendations_v02.sql b/db/views/follow_recommendations_v02.sql
index 673c5cc85..f67c6eecf 100644
--- a/db/views/follow_recommendations_v02.sql
+++ b/db/views/follow_recommendations_v02.sql
@@ -18,7 +18,7 @@ FROM (
   HAVING count(follows.id) >= 5
   UNION ALL
   SELECT account_summaries.account_id AS account_id,
-         sum(reblogs_count + favourites_count) / (1.0 + sum(reblogs_count + favourites_count)) AS rank,
+         sum(status_stats.reblogs_count + status_stats.favourites_count) / (1.0 + sum(status_stats.reblogs_count + status_stats.favourites_count)) AS rank,
          'most_interactions' AS reason
   FROM status_stats
   INNER JOIN statuses ON statuses.id = status_stats.status_id
@@ -28,7 +28,7 @@ FROM (
     AND account_summaries.sensitive = 'f'
     AND follow_recommendation_suppressions.id IS NULL
   GROUP BY account_summaries.account_id
-  HAVING sum(reblogs_count + favourites_count) >= 5
+  HAVING sum(status_stats.reblogs_count + status_stats.favourites_count) >= 5
 ) t0
 GROUP BY account_id
 ORDER BY rank DESC