Rails: Is the version number in 'schema.rb' used for anything?

Question

Now that Rails has timestamped migrations, the single version number at the top of /db/schema.rb seems pointless. Sometimes the version number ends up incorrec

Answer 1

I decided to investigate myself. It turns out that because of the timestamped migrations, the only thing Rails does with that number is assume that the migration with that particular timestamp has already been applied and thus create the appropriate entry in the schema_migration table if it doesn't exist.

from: /lib/active_record/connection_adapters/abstract/schema_statements.rb

def assume_migrated_upto_version(version, migrations_path = ActiveRecord::Migrator.migrations_path)
    # other code ... 
    unless migrated.include?(version)
      execute "INSERT INTO #{sm_table} (version) VALUES ('#{version}')"
    end
    # ...