Method: RailsInstaller#pre_migrate_database

Defined in:
lib/rails-installer.rb

#pre_migrate_database ⇒ Object

Pre-migrate the database. This checks to see if we’re downgrading to an earlier version of our app, and runs ‘rake migrate VERSION=…’ to downgrade the database.



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# File 'lib/rails-installer.rb', line 489

def pre_migrate_database
  old_schema_version = get_schema_version
  new_schema_version = File.read(File.join(source_directory,'db','schema_version')).to_i
  
  return unless old_schema_version > 0
   
  # Are we downgrading?
  if old_schema_version > new_schema_version
    message "Downgrading schema from #{old_schema_version} to #{new_schema_version}"
    
    in_directory install_directory do
      unless system("rake -s migrate VERSION=#{new_schema_version}")
        raise InstallFailed, "Downgrade migrating from #{old_schema_version} to #{new_schema_version} failed."
      end
    end
  end
end