Add config.active_record.dump_schemas.

Fixes db:structure:dump when using schema_search_path and PostgreSQL
extensions.

Closes #17157.

5 files changed, 69 insertions, 7 deletions

diff --git a/activerecord/CHANGELOG.md b/activerecord/CHANGELOG.md
index 73e171f3ba..07714538fb 100644
--- a/activerecord/CHANGELOG.md
+++ b/activerecord/CHANGELOG.md
@@ -1,3 +1,10 @@
+*   Add `config.active_record.dump_schemas` to fix `db:structure:dump`
+    when using schema_search_path and PostgreSQL extensions.
+
+    Fixes #17157.
+
+    *Ryan Wallace*
+
 *   Renaming `use_transactional_fixtures` to `use_transactional_tests` for clarity.
 
     Fixes #18864.
diff --git a/activerecord/lib/active_record/core.rb b/activerecord/lib/active_record/core.rb
index 82edc4eda5..9a39a0e919 100644
--- a/activerecord/lib/active_record/core.rb
+++ b/activerecord/lib/active_record/core.rb
@@ -85,6 +85,15 @@ module ActiveRecord
       mattr_accessor :dump_schema_after_migration, instance_writer: false
       self.dump_schema_after_migration = true
 
+      ##
+      # :singleton-method:
+      # Specifies which database schemas to dump when calling db:structure:dump.
+      # If :schema_search_path (the default), it will dumps any schemas listed in schema_search_path.
+      # Use :all to always dumps all schemas regardless of the schema_search_path.
+      # A string of comma separated schemas can also be used to pass a custom list of schemas.
+      mattr_accessor :dump_schemas, instance_writer: false
+      self.dump_schemas = :schema_search_path
+
       mattr_accessor :maintain_test_schema, instance_accessor: false
 
       mattr_accessor :belongs_to_required_by_default, instance_accessor: false
diff --git a/activerecord/lib/active_record/tasks/postgresql_database_tasks.rb b/activerecord/lib/active_record/tasks/postgresql_database_tasks.rb
index ce1de4b76e..435708a421 100644
--- a/activerecord/lib/active_record/tasks/postgresql_database_tasks.rb
+++ b/activerecord/lib/active_record/tasks/postgresql_database_tasks.rb
@@ -46,7 +46,15 @@ module ActiveRecord
 
       def structure_dump(filename)
         set_psql_env
-        search_path = configuration['schema_search_path']
+
+        search_path = case ActiveRecord::Base.dump_schemas
+        when :schema_search_path
+          configuration['schema_search_path']
+        when :all
+          nil
+        when String
+          ActiveRecord::Base.dump_schemas
+        end
         unless search_path.blank?
           search_path = search_path.split(",").map{|search_path_part| "--schema=#{Shellwords.escape(search_path_part.strip)}" }.join(" ")
         end
diff --git a/activerecord/test/cases/tasks/postgresql_rake_test.rb b/activerecord/test/cases/tasks/postgresql_rake_test.rb
index 0d574d071c..d45fb07417 100644
--- a/activerecord/test/cases/tasks/postgresql_rake_test.rb
+++ b/activerecord/test/cases/tasks/postgresql_rake_test.rb
@@ -195,21 +195,54 @@ module ActiveRecord
         'adapter'  => 'postgresql',
         'database' => 'my-app-db'
       }
+      @filename = "awesome-file.sql"
 
       ActiveRecord::Base.stubs(:connection).returns(@connection)
       ActiveRecord::Base.stubs(:establish_connection).returns(true)
       Kernel.stubs(:system)
+      File.stubs(:open)
     end
 
     def test_structure_dump
-      filename = "awesome-file.sql"
-      Kernel.expects(:system).with("pg_dump -i -s -x -O -f #{filename}  my-app-db").returns(true)
-      @connection.expects(:schema_search_path).returns("foo")
+      Kernel.expects(:system).with("pg_dump -i -s -x -O -f #{@filename}  my-app-db").returns(true)
+
+      ActiveRecord::Tasks::DatabaseTasks.structure_dump(@configuration, @filename)
+    end
+
+    def test_structure_dump_with_schema_search_path
+      @configuration['schema_search_path'] = 'foo,bar'
+
+      Kernel.expects(:system).with("pg_dump -i -s -x -O -f #{@filename} --schema=foo --schema=bar my-app-db").returns(true)
+
+      ActiveRecord::Tasks::DatabaseTasks.structure_dump(@configuration, @filename)
+    end
+
+    def test_structure_dump_with_schema_search_path_and_dump_schemas_all
+      @configuration['schema_search_path'] = 'foo,bar'
+
+      Kernel.expects(:system).with("pg_dump -i -s -x -O -f #{@filename}  my-app-db").returns(true)
+
+      with_dump_schemas(:all) do
+        ActiveRecord::Tasks::DatabaseTasks.structure_dump(@configuration, @filename)
+      end
+    end
+
+    def test_structure_dump_with_dump_schemas_string
+      Kernel.expects(:system).with("pg_dump -i -s -x -O -f #{@filename} --schema=foo --schema=bar my-app-db").returns(true)
+
+      with_dump_schemas('foo,bar') do
+        ActiveRecord::Tasks::DatabaseTasks.structure_dump(@configuration, @filename)
+      end
+    end
+
+    private
 
-      ActiveRecord::Tasks::DatabaseTasks.structure_dump(@configuration, filename)
-      assert File.exist?(filename)
+    def with_dump_schemas(value, &block)
+      old_dump_schemas = ActiveRecord::Base.dump_schemas
+      ActiveRecord::Base.dump_schemas = value
+      yield
     ensure
-      FileUtils.rm(filename)
+      ActiveRecord::Base.dump_schemas = old_dump_schemas
     end
   end
 
diff --git a/guides/source/configuring.md b/guides/source/configuring.md
index 4ebd634cd6..67285030a9 100644
--- a/guides/source/configuring.md
+++ b/guides/source/configuring.md
@@ -302,6 +302,11 @@ All these configuration options are delegated to the `I18n` library.
   `config/environments/production.rb` which is generated by Rails. The
   default value is true if this configuration is not set.
 
+* `config.active_record.dump_schemas` controls which database schemas will be dumped when calling db:structure:dump.
+  The options are `:schema_search_path` (the default) which dumps any schemas listed in schema_search_path,
+  `:all` which always dumps all schemas regardless of the schema_search_path,
+  or a string of comma separated schemas.
+
 * `config.active_record.belongs_to_required_by_default` is a boolean value and controls whether `belongs_to` association is required by default.
 
 The MySQL adapter adds one additional configuration option: