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symfony: forms with some fields related each other
Region:
  columns:
    name: { type: string(255), notnull: true, unique: true }
  options:
    symfony: { form: false, filter: false }

Province:
  columns:
    id: { type: string(2), notnull: true, primary: true }
    name: { type: string(255), notnull: true, unique: true }
    region_id: { type: integer, notnull: true }
  relations:
    Region: { local: region_id, foreign: id, onDelete: CASCADE, foreignAlias: Provinces }
  options:
    symfony: { form: false, filter: false }

City:
  columns:
    id: { type: string(4), notnull: true, primary: true }
    name: { type: string(255), notnull: true, unique: true }
    province_id: { type: string(2), notnull: true }
    latitude: { type: decimal, scale: 6, size: 8, notnull: true }
    longitude: { type: decimal, scale: 6, size: 8, notnull: true }
  relations:
    Province: { local: province_id, foreign: id, onDelete: CASCADE, foreignAlias: Cities }
  options:
    symfony: { form: false, filter: false }