Fixed db:prepare task for multiple databases.

When one database existed already, but not the other,
during setup of missing one, existing database was wiped out.

1 files changed, 30 insertions, 12 deletions

diff --git a/railties/test/isolation/abstract_unit.rb b/railties/test/isolation/abstract_unit.rb
index fab704944b..0fe62df8ba 100644
--- a/railties/test/isolation/abstract_unit.rb
+++ b/railties/test/isolation/abstract_unit.rb
@@ -448,18 +448,36 @@ module TestHelpers
       $:.reject! { |path| path =~ %r'/(#{to_remove.join('|')})/' }
     end
 
-    def use_postgresql
-      File.open("#{app_path}/config/database.yml", "w") do |f|
-        f.puts <<-YAML
-        default: &default
-          adapter: postgresql
-          pool: 5
-          database: railties_test
-        development:
-          <<: *default
-        test:
-          <<: *default
-        YAML
+    def use_postgresql(multi_db: false)
+      if multi_db
+        File.open("#{app_path}/config/database.yml", "w") do |f|
+          f.puts <<-YAML
+          default: &default
+            adapter: postgresql
+            pool: 5
+          development:
+            primary:
+              <<: *default
+              database: railties_test
+            animals:
+              <<: *default
+              database: railties_animals_test
+              migrations_paths: db/animals_migrate
+          YAML
+        end
+      else
+        File.open("#{app_path}/config/database.yml", "w") do |f|
+          f.puts <<-YAML
+          default: &default
+            adapter: postgresql
+            pool: 5
+            database: railties_test
+          development:
+            <<: *default
+          test:
+            <<: *default
+          YAML
+        end
       end
     end
   end