[symfony-users] Doctrine newbie

Hi,

I'm learning Symfony with Doctrine at the moment and stuck

This schema:

City:
  columns:
    id:
      type: integer
      primary: true
      autoincrement: true
    name:
      type: string(50)
      notnull: true

Suburb:
  columns:
    id:
      type: integer
      primary: true
      autoincrement: true
    name:
      type: string(50)
      notnull: true
    city_id:
      type: integer
      notnull: true
  relations:
    City:
      foreignAlias: Suburbs

Giving me:

Validation failed in class Suburb

    1 field had validation error:

      * 1 validator failed on city_id (type)

What is wrong with the schema? I tried changing few things but still
getting the same error

Regards,

Sid

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