propel:
  sf_guard_group:
    _attributes:    { phpName: sfGuardGroup }
    id:             ~
    name:           { type: varchar, size: 255, required: true, index: unique }
    description:    { type: longvarchar }
  
  sf_guard_permission:
    _attributes:    { phpName: sfGuardPermission }
    id:             ~
    name:           { type: varchar, size: 255, required: true, index: unique }
    description:    { type: longvarchar }
  
  sf_guard_group_permission:
    _attributes:    { phpName: sfGuardGroupPermission }
    group_id:       { type: integer, primaryKey: true, required: true, foreignTable: sf_guard_group, foreignReference: id, onDelete: cascade }
    permission_id:  { type: integer, primaryKey: true, required: true, foreignTable: sf_guard_permission, foreignReference: id, onDelete: cascade }

propel:
  blog_article:
    _attributes: { phpName: Article }
    id:
    title:       varchar(255)
    content:     longvarchar
    created_at:
  blog_comment:
    _attributes: { phpName: Comment }
    id:
    article_id:
    author:      varchar(255)
    content:     longvarchar
    created_at:

propel schema.yml

PHP