Difference between revisions of "Rails:Migrations"
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== Official Documentation == | == Official Documentation == | ||
* https://guides.rubyonrails.org/active_record_migrations.html | * https://guides.rubyonrails.org/active_record_migrations.html | ||
| + | |||
| + | == Database Types == | ||
| + | For list of (postgres) column types, see: | ||
| + | |||
| + | * https://stackoverflow.com/q/17918117/1093087 | ||
| + | * https://github.com/rails/rails/blob/master/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb (See <tt>NATIVE_DATABASE_TYPES</tt>) | ||
== Schema Migrations == | == Schema Migrations == | ||
=== Generate a Migration === | === Generate a Migration === | ||
| − | ==== | + | ==== Generic ==== |
| + | <pre># rails g migration <name> | ||
| + | rails g migration CreateCruds</pre> | ||
| + | |||
| + | === Run the Migration === | ||
| + | <pre># Run new migrations | ||
| + | rails db:migrate | ||
| + | |||
| + | # Don't forget to test rollbacks on new migrations | ||
| + | rails db:rollback STEP=1</pre> | ||
== Data Migrations == | == Data Migrations == | ||
Latest revision as of 18:29, 27 October 2019
Contents
Official Documentation
Database Types
For list of (postgres) column types, see:
- https://stackoverflow.com/q/17918117/1093087
- https://github.com/rails/rails/blob/master/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb (See NATIVE_DATABASE_TYPES)
Schema Migrations
Generate a Migration
Generic
# rails g migration <name> rails g migration CreateCruds
Run the Migration
# Run new migrations rails db:migrate # Don't forget to test rollbacks on new migrations rails db:rollback STEP=1
Data Migrations
What if you need to do a data migration or data fix on existing data?
