Run DB rake tasks on all tenants

Some tasks don't have to run on every tenant. The task to calculate the
TSV is only done for records which were present before we added the TSV
column, and that isn't going to happen in any tenants because we added
the TSV column before adding the tenants table. Similarly, the migration
needed for existing polls isn't necessary because there weren't any
tenants before we allowed to set the starting/ending time to polls.

We aren't adding any tests for these tasks because tests for rake tasks
are slow and tests creating tenants are also slow, making the
combination of the two even slower, particularly if we add tests for
every single task we're changing. We're adding tests for the
`.run_on_each` method instead.

app/models/tenant.rb

@@ -43,6 +43,12 @@ class Tenant < ApplicationRecord
     Apartment::Tenant.switch(...)
   end
 
+  def self.run_on_each(&block)
+    ["public"].union(Apartment.tenant_names).each do |schema|
+      switch(schema, &block)
+    end
+  end
+
   private
 
     def create_schema

lib/tasks/files.rake

@@ -1,8 +1,10 @@
 namespace :files do
   desc "Removes cached attachments which weren't deleted for some reason"
   task remove_old_cached_attachments: :environment do
-    ActiveStorage::Blob.unattached
-                       .where("active_storage_blobs.created_at <= ?", 1.day.ago)
-                       .find_each(&:purge_later)
+    Tenant.run_on_each do
+      ActiveStorage::Blob.unattached
+                         .where("active_storage_blobs.created_at <= ?", 1.day.ago)
+                         .find_each(&:purge_later)
+    end
   end
 end

lib/tasks/settings.rake

@@ -2,7 +2,7 @@ namespace :settings do
   desc "Add new settings"
   task add_new_settings: :environment do
     ApplicationLogger.new.info "Adding new settings"
-    Setting.add_new_settings
+    Tenant.run_on_each { Setting.add_new_settings }
   end
 
   desc "Rename existing settings"

lib/tasks/stats.rake

@@ -2,23 +2,28 @@ namespace :stats do
   desc "Generates stats which are not cached yet"
   task generate: :environment do
     ApplicationLogger.new.info "Updating budget and poll stats"
-    admin_ability = Ability.new(Administrator.first.user)
 
-    Budget.accessible_by(admin_ability, :read_stats).find_each do |budget|
-      Budget::Stats.new(budget).generate
-      print "."
-    end
+    Tenant.run_on_each do
+      admin_ability = Ability.new(Administrator.first.user)
 
-    Poll.accessible_by(admin_ability, :stats).find_each do |poll|
-      Poll::Stats.new(poll).generate
-      print "."
+      Budget.accessible_by(admin_ability, :read_stats).find_each do |budget|
+        Budget::Stats.new(budget).generate
+        print "."
+      end
+
+      Poll.accessible_by(admin_ability, :stats).find_each do |poll|
+        Poll::Stats.new(poll).generate
+        print "."
+      end
     end
   end
 
   desc "Expires stats cache"
   task expire_cache: :environment do
-    [Budget, Poll].each do |model_class|
-      model_class.find_each { |record| record.find_or_create_stats_version.touch }
+    Tenant.run_on_each do
+      [Budget, Poll].each do |model_class|
+        model_class.find_each { |record| record.find_or_create_stats_version.touch }
+      end
     end
   end
 

lib/tasks/votes.rake

@@ -5,9 +5,12 @@ namespace :votes do
 
     models.each do |model|
       print "Updating votes hot_score for #{model}s"
-      model.find_each do |resource|
-        new_hot_score = resource.calculate_hot_score
-        resource.update_columns(hot_score: new_hot_score, updated_at: Time.current)
+
+      Tenant.run_on_each do
+        model.find_each do |resource|
+          new_hot_score = resource.calculate_hot_score
+          resource.update_columns(hot_score: new_hot_score, updated_at: Time.current)
+        end
       end
       puts " ✅ "
     end

spec/models/tenant_spec.rb

@@ -133,6 +133,27 @@ describe Tenant do
     end
   end
 
+  describe ".run_on_each" do
+    it "runs the code on all tenants, including the default one" do
+      create(:tenant, schema: "andromeda")
+      create(:tenant, schema: "milky-way")
+
+      Tenant.run_on_each do
+        Setting["org_name"] = "oh-my-#{Tenant.current_schema}"
+      end
+
+      expect(Setting["org_name"]).to eq "oh-my-public"
+
+      Tenant.switch("andromeda") do
+        expect(Setting["org_name"]).to eq "oh-my-andromeda"
+      end
+
+      Tenant.switch("milky-way") do
+        expect(Setting["org_name"]).to eq "oh-my-milky-way"
+      end
+    end
+  end
+
   describe "validations" do
     let(:tenant) { build(:tenant) }