Question

As far as I know to make a column unique the structure below should be used:

database:
  table_name:
    column_name: { ..., index: unique }

I want to make multiple columns unique at once. How am I going to do this?
Thanks in advance.

Answer 1

If you’re talking about a composite unique key (e.g., having a unique key based on the combination of multiple fields in the same table), here’s how you’d do that :

<unique name="document-version-index">
  <unique-column name="document_id" />
  <unique-column name="version_id" />
</unique>

As for the yaml syntax, I know you can do it in doctrine (see below), but not sure exactly of the propel format.

Doctrine format (–> from stackoverflow thread: primary key + composite primary key causing problem ) :

Pet:
  columns:
  pet_name:  {type: string(32)}
  owner_id: {type: integer}
indexes:
  owner_name:
    fields: [pet_name, owner_id]
    type: unique