Refactor change generator database implementation

The database object does not need to know about the other packages in the Dockerfile. This info is only needed for the change generator so lets move it there.

Author: andrewn617

railties/lib/rails/generators/database.rb

@@ -46,14 +46,6 @@ def gem
         raise NotImplementedError
       end
 
-      def docker_base
-        raise NotImplementedError
-      end
-
-      def docker_build
-        raise NotImplementedError
-      end
-
       def base_package
         raise NotImplementedError
       end
@@ -125,14 +117,6 @@ def gem
           ["mysql2", ["~> 0.5"]]
         end
 
-        def docker_base
-          "curl default-mysql-client libvips"
-        end
-
-        def docker_build
-          "build-essential default-libmysqlclient-dev git"
-        end
-
         def base_package
           "default-mysql-client"
         end
@@ -172,14 +156,6 @@ def gem
           ["pg", ["~> 1.1"]]
         end
 
-        def docker_base
-          "curl libvips postgresql-client"
-        end
-
-        def docker_build
-          "build-essential git libpq-dev"
-        end
-
         def base_package
           "postgresql-client"
         end
@@ -220,14 +196,6 @@ def gem
           ["trilogy", ["~> 2.7"]]
         end
 
-        def docker_base
-          "curl libvips"
-        end
-
-        def docker_build
-          "build-essential git"
-        end
-
         def base_package
           nil
         end
@@ -258,14 +226,6 @@ def gem
           ["sqlite3", [">= 1.4"]]
         end
 
-        def docker_base
-          "curl libsqlite3-0 libvips"
-        end
-
-        def docker_build
-          "build-essential git"
-        end
-
         def base_package
           "libsqlite3-0"
         end
@@ -284,8 +244,6 @@ def name; end
         def service; end
         def port; end
         def volume; end
-        def docker_base; end
-        def docker_build; end
         def base_package; end
         def build_package; end
         def feature_name; end

railties/lib/rails/generators/rails/db/system/change/change_generator.rb

@@ -11,6 +11,9 @@ module System
         class ChangeGenerator < Base # :nodoc:
           include AppName
 
+          BASE_PACKAGES = %w( curl libvips )
+          BUILD_PACKAGES = %w( build-essential git )
+
           class_option :to, required: true,
             desc: "The database system to switch to."
 
@@ -45,14 +48,8 @@ def edit_dockerfile
             dockerfile_path = File.expand_path("Dockerfile", destination_root)
             return unless File.exist?(dockerfile_path)
 
-            base_name = database.docker_base
-            build_name = database.docker_build
-            if base_name
-              gsub_file("Dockerfile", all_docker_bases_regex, base_name)
-            end
-            if build_name
-              gsub_file("Dockerfile", all_docker_builds_regex, build_name)
-            end
+            gsub_file("Dockerfile", all_docker_bases_regex, docker_base_packages(database.base_package))
+            gsub_file("Dockerfile", all_docker_builds_regex, docker_build_packages(database.build_package))
           end
 
           def edit_devcontainer_files
@@ -69,11 +66,27 @@ def all_database_gems
             end
 
             def all_docker_bases
-              Database.all.filter_map { |database| database.docker_base }
+              Database.all.map { |database| docker_base_packages(database.base_package) }.uniq
+            end
+
+            def docker_base_packages(database_package)
+              if database_package
+                [database_package].concat(BASE_PACKAGES).sort
+              else
+                BASE_PACKAGES
+              end.join("\s")
             end
 
             def all_docker_builds
-              Database.all.filter_map { |database| database.docker_build }
+              Database.all.map { |database| docker_build_packages(database.build_package) }.uniq
+            end
+
+            def docker_build_packages(database_package)
+              if database_package
+                [database_package].concat(BUILD_PACKAGES).sort
+              else
+                BUILD_PACKAGES
+              end.join("\s")
             end
 
             def all_database_gems_regex