MergeDBSchema

It is a git merge driver for db/schema.rb of Ruby on Rails. It resolves some of the conflict automatically.

# Can't merge a branch because schema version is conflicted.
$ git merge change1
Auto-merging db/schema.rb
CONFLICT (content): Merge conflict in db/schema.rb
Automatic merge failed; fix conflicts and then commit the result.

$ git diff
diff --cc db/schema.rb
index bdb07db,da150fc..0000000
--- a/db/schema.rb
+++ b/db/schema.rb
@@@ -10,7 -10,7 +10,11 @@@
  #
  # It's strongly recommended that you check this file into your version control system.
  
++<<<<<<< HEAD
 +ActiveRecord::Schema.define(version: 20170701103541) do
++=======
+ ActiveRecord::Schema.define(version: 20170701103437) do
++>>>>>>> change1
  
    create_table "articles", force: :cascade do |t|
      t.string   "title"

$ git merge --abort

# Install merge_db_schema
$ merge_db_schema-init --force
Initializing .gitattributes ... done!
Initializing .git/config ... done!
Successfully initialized!

# The conflict is resolved automatically!
$ git merge change1
Auto-merging db/schema.rb
Merge made by the 'recursive' strategy.
 db/migrate/20170701103437_add_address_to_user.rb | 5 +++++
 db/schema.rb                                     | 1 +
 2 files changed, 6 insertions(+)
 create mode 100644 db/migrate/20170701103437_add_address_to_user.rb

Installation

Add this line to your application's Gemfile:

gem 'merge_db_schema'

And then execute:

$ bundle

Or install it yourself as:

$ gem install merge_db_schema

Initializing this gem

Run merge_db_schema-init and edit .git/config.

$ merge_db_schema-init
Initializing .gitattributes ... done!
Add the following code into .git/config, initializing is completed!

[merge "merge_db_schema"]
	name = Merge db/schema.rb
	driver = merge_db_schema %O %A %B
	recursive = text

If you add --force option to the command, it edits .git/config automatically.

$ merge_db_schema-init --force
Initializing .gitattributes ... done!
Initializing .git/config ... done!
Successfully initialized!

Note: .git/config is not tracked by Git. So, other team members should edit .git/config to use this gem.

License

Apache License 2.0 See LICENSE