This project aims to be an agnostic migration system for mongodb. Sometimes when you add attributes, you need to give a value for existing documents. Doing this frequently, this tool can help, since it has an straightforward syntax and simplicity.

MongoDB client - the bin file that comes with mongodb. I will soon create an installation script to make things easier. For now you need to download it from mongodb website. - http://www.mongodb.org/downloads

$ git clone git://github.com/emerleite/mongo-migrate.git
$ cd mongo-migrate
$ cp config-sample.cfg config.cfg

Edit config.cfg with your database information

By convention, mongo migrate uses the directory db/migrate when generating and running migrations. You can change it, by editing the MIGRATION_DIR configuration at config.cfg. See config.sample.cfg for details.

MongoDB migrate uses a configuration file called config.cfg. It has the following options:

• MONGO_HOST - The database host. Default is localhost
• MONGO_DATABASE - Required. Do not have default value
• MIGRATION_DIR - Where to find migrations. Default is ./db/migrate/
• MONGO_USR - Username. Default is empty
• MONGO_PWD - Password. Default is empty

Note: When you use MONGO_USR and not MONGO_PWD you'll be prompted for password.

Mongo migrate has two modes. generate and run. The syntax is pretty straitforward as explained above:

Mongo migrate generates migrtion in the following format:

YYYMMDDhhmmssmm_name.js. Ex: 20111209002426_add_person.js

$ ./mongo_migrate -gf [migration_name]

This will generate the following file:

var migration = {
  up: function() {
  
  },
  down: function() {

  }
};

migration[target].call();

Put the code for the changes on up and the code for rollback on down.

Mongo migrate has 2 modes of running. Up and Down. The first make things happen and the second is a rollback. For these 2 modes, we call run one specific migration or all migrations. Mongo migrate controll the current migration, to enable run only the last migrations or just run all.

-g generate -r run -t target (up|down) -f file_name -c configuration file

$ ./mongo_migrate -rt up   -f [file_name]
$ ./mongo_migrate -rt down -f [file_name]

The name can bem the full name or partial name. Ex: 20111209002426_add_person.js or only add_person. Mongo migrate will first look for a full name and after will fallback to find the file based on the partial name.

$ ./mongo_migrate -rt up
$ ./mongo_migrate -rt down

If you want to pass the configuration file path and not use the convention (i.e ./config.cfg), just use the -c option parameter:

$ ./mongo_migrate -rt up -f migration_file -c /path/to/config/file
$ ./mongo_migrate -rt down -c /path/to/config/file
$ ./mongo_migrate -gf migration_name -c /path/to/config/file

When running all migrations, mongo migrate will run only the new migrations, because it controls witch is the last one.

• see (https://github.com/emerleite/mongo-migrate/issues)

• Emerson Macedo (http://codificando.com/)

(The MIT License)

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The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

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