From 4fc30744036964a7454556575bcdb5eef70f0825 Mon Sep 17 00:00:00 2001
From: schneems <richard.schneeman@gmail.com>
Date: Thu, 14 Jan 2016 15:09:18 -0600
Subject: Revert "Revert "Set environment even when no migration runs""

This reverts commit 11e85b91731ca6125ee1db33553f984549a3bc2b.
---
 activerecord/lib/active_record/migration.rb | 48 ++++++++++++++++++-----------
 1 file changed, 30 insertions(+), 18 deletions(-)

(limited to 'activerecord/lib/active_record/migration.rb')

diff --git a/activerecord/lib/active_record/migration.rb b/activerecord/lib/active_record/migration.rb
index 4a6e9c12fe..f5b29c7f2e 100644
--- a/activerecord/lib/active_record/migration.rb
+++ b/activerecord/lib/active_record/migration.rb
@@ -1170,45 +1170,58 @@ module ActiveRecord
 
     private
 
+    # Used for running a specific migration.
     def run_without_lock
       migration = migrations.detect { |m| m.version == @target_version }
       raise UnknownMigrationVersionError.new(@target_version) if migration.nil?
-      unless (up? && migrated.include?(migration.version.to_i)) || (down? && !migrated.include?(migration.version.to_i))
-        begin
-          execute_migration_in_transaction(migration, @direction)
-        rescue => e
-          canceled_msg = use_transaction?(migration) ? ", this migration was canceled" : ""
-          raise StandardError, "An error has occurred#{canceled_msg}:\n\n#{e}", e.backtrace
-        end
-      end
+      execute_migration_in_transaction(migration, @direction)
+
+      record_environment
     end
 
+    # Used for running multiple migrations up to or down to a certain value.
     def migrate_without_lock
-      if !target && @target_version && @target_version > 0
+      if invalid_target?
         raise UnknownMigrationVersionError.new(@target_version)
       end
 
       runnable.each do |migration|
-        Base.logger.info "Migrating to #{migration.name} (#{migration.version})" if Base.logger
-
-        begin
-          execute_migration_in_transaction(migration, @direction)
-        rescue => e
-          canceled_msg = use_transaction?(migration) ? "this and " : ""
-          raise StandardError, "An error has occurred, #{canceled_msg}all later migrations canceled:\n\n#{e}", e.backtrace
-        end
+        execute_migration_in_transaction(migration, @direction)
       end
+
+      record_environment
+    end
+
+    # Stores the current environment in the database.
+    def record_environment
+      return if down?
+      ActiveRecord::InternalMetadata[:environment] = ActiveRecord::Migrator.current_environment
     end
 
     def ran?(migration)
       migrated.include?(migration.version.to_i)
     end
 
+    # Return true if a valid version is not provided.
+    def invalid_target?
+      !target && @target_version && @target_version > 0
+    end
+
     def execute_migration_in_transaction(migration, direction)
+      return if down? && !migrated.include?(migration.version.to_i)
+      return if up?   &&  migrated.include?(migration.version.to_i)
+
+      Base.logger.info "Migrating to #{migration.name} (#{migration.version})" if Base.logger
+
       ddl_transaction(migration) do
         migration.migrate(direction)
         record_version_state_after_migrating(migration.version)
       end
+    rescue => e
+      msg = "An error has occurred, "
+      msg << "this and " if use_transaction?(migration)
+      msg << "all later migrations canceled:\n\n#{e}"
+      raise StandardError, msg, e.backtrace
     end
 
     def target
@@ -1238,7 +1251,6 @@ module ActiveRecord
       else
         migrated << version
         ActiveRecord::SchemaMigration.create!(version: version.to_s)
-        ActiveRecord::InternalMetadata[:environment] = ActiveRecord::Migrator.current_environment
       end
     end
 
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