Rails (ActiveRecord to be more precise) is adding an id column to your table and making this column the primary key. For PostgreSQL, this column will have type serial. A serial column is essentially a four byte integer combined with a sequence to automatically provide auto-incrementing values. The first notice: NOTICE: CREATE TABLE will create … Read more
In your app/config/database.php you have to: <?php return array( ‘default’ => ‘mysql’, ‘connections’ => array( # Our primary database connection ‘mysql’ => array( ‘driver’ => ‘mysql’, ‘host’ => ‘host1’, ‘database’ => ‘database1’, ‘username’ => ‘user1’, ‘password’ => ‘pass1’ ‘charset’ => ‘utf8’, ‘collation’ => ‘utf8_unicode_ci’, ‘prefix’ => ”, ), # Our secondary database connection ‘mysql2’ => … Read more
I wouldn’t really agree with incremental migrations being rotten. Having a set of homegrown scripts would, in my opinion, be a worse approach than having a real tool for such a job will make tracking those changes easier. I’ve had to deal with a similar situation myself, before, so hopefully I can share some of … Read more
It turns out there’s a very simple, pragmatic solution to this: alembic upgrade <target-revision> || alembic downgrade <target-revision>
I was having a similar problem. I checked different websites and tried what they suggested but didn’t work. Then I tried what you suggested. rake db:create:all and rake db:migrate it worked for me. Thank you!
By the sounds of it, you are more interested in sequentially listed revision files rather than sequentially ordered revision ids. The former can be achieved without any change to how the revision ids are generated. The alembic.ini file that is generated when you run alembic init alembic has a section that configures the naming of … Read more
Django writes a record into the table django_migrations consisting of some information like the app the migration belongs to, the name of the migration, and the date it was applied.
Rails migration does not provide any way to add Constraints, but you can still do it via migration but by passing actual SQL to execute() Create Migration file: ruby script/generate Migration AddConstraint Now, in the migration file: class AddConstraint < ActiveRecord::Migration def self.up execute “ALTER TABLE table_name ADD CONSTRAINT check_constraint_name CHECK (check_column_name IN (1, 2, … Read more
Yes, it is possible. To change the schema of a database object you need to run the following SQL script: ALTER SCHEMA NewSchemaName TRANSFER OldSchemaName.ObjectName Where ObjectName can be the name of a table, a view or a stored procedure. The problem seems to be getting the list of all database objects with a given … Read more
One way to prevent an old version from breaking is to split a migration into multiple steps. E.g. you want to rename a column in the database. Renaming the column directly would break old versions of the app. This can be split into multiple steps: Add a db migration that inserts the new column Change … Read more