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Tells Rails whether to use Timelocal (using :local) or Timeutc (using :utc) when pulling dates and times from the database Defaults to :local
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Specifies the format to use when dumping the database schema with certain default rake tasks Use the :sql option to have the schema dumped as potentially database-specific SQL statements Just beware of incompatibilities if you re trying to use the :sql option with different databases for development and testing The default option is :ruby, which dumps the schema as an ActiveRecord::Schema file that can be loaded into any database that supports migrations
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510 Conclusion
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Specifies whether Active Record should store the full constant name including namespace when using Single-Table Inheritance (STI), covered in 9, Advanced Active Record
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This chapter covered the fundamentals of Active Record, the framework included with Ruby on Rails for creating database-bound model classes We ve learned how Active Record expresses the convention over configuration philosophy that is such an important part of the Rails way, and how to make settings manually, which override the conventions in place We ve also looked at the methods provided by ActiveRecord::Base, the parent class of all persistent models in Rails, which include everything you need to do basic CRUD operations: Create, Read, Update, and Delete Finally, we reviewed how to drill through Active Record to use the database connection whenever you need to do so In the following chapter, we continue our coverage of Active Record by learning about how related model objects interact via associations
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C HAPTER 6
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It s a fact of life that the database schema of your application will evolve over the course of development Tables are added, names of columns are changed, things are dropped you get the picture Without strict conventions and process discipline for the application developers to follow, keeping the database schema in proper lock-step with application code is traditionally a very troublesome job Migrations are the Rails way of helping you to evolve the database schema of your application (also known as its DDL) without having to drop and re-create the database each time you make a change And not having to drop and recreate the database each time a change happens means that you don t lose your development data That may or may not be that important, but is usually very convenient The only changes made when you execute a migration are those necessary to move the schema from one version to another, whether that move is forward or backward in time Of course, being able to evolve your schema without having to recreate your databases and the loading/reloading of data is an order of magnitude more important once you re in production
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61 Creating Migrations
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$ rails generate migration Usage: rails generate migration NAME [field:type field:type] [options]
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6: Active Record Migrations
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At minimum, you need to supply descriptive name for the migration in CamelCase (or underscored text, both work,) and the generator does the rest Other generators, such as the model and scaffolding generators, also create migration scripts for you, unless you specify the --skip-migration option The descriptive part of the migration name is up to you, but most Rails developers that I know try to make it match the schema operation (in simple cases) or at least allude to what s going on inside (in more complex cases) Note that if you change the classname of your migration to something that doesn t match its filename, you will get an uninitialized constant error when that migration gets executed
611 Sequencing Migrations
Prior to Rails 21, the migrations were sequenced via a simple numbering scheme baked into the name of the migration file, and automatically handled by the migration generator Each migration received a sequential number There were many inconveniences inherent in that approach, especially in team environments where two developers could check in a migration with the same sequence number Thankfully those issues have been eliminated by using timestamps to sequence migrations Migrations that have already been run are listed in a special database table that Rails maintains It is named schema_migrations and only has one column:
mysql> desc schema_migrations; +---------+--------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +---------+--------------+------+-----+---------+-------+ | version | varchar(255) | NO | PRI | NULL | | +---------+--------------+------+-----+---------+-------+ 1 row in set (000 sec)
When you pull down new migrations from source control, rake db:migrate will check the schema_migrations table and execute all migrations that have not yet run (even if they have earlier timestamps than migrations that you ve added yourself in the interim)