Symfony原则-ManyToOne关系中的ID长度

Question

When I do a 'doctrine:migrations:diff', Symfony does not 'export' the field length, puts '255' instead and 'doctrine:migrations:migrate' does not work.

My two entities ORM definitions:

App\Resources\Domain\Stage:
type: entity
fields:
    id:
        type: stage_id
        id: true
        length: 36
    name:
        type: string
manyToOne:
    educationalAreaId:
        targetEntity: EducationalArea
        joinColumn:
            name: educationalAreaId
            referencedColumnName: id

App\Resources\Domain\EducationalArea:
type: entity
fields:
    id:
        type: educational_area_id
        id: true
        length: 36
    name:
        type: string

I've tried to set the 'length' property inside the manyToOne definition with no success.

(I use string type in Ids because I generate UUIDs)

Answer 1

IMO doctrine annotations are more convenient way to map your entities, but anyway I think you do something wrong with types of your fields. The type attribute defines the mapping type to use for the column in database, so it should be string , integer , json_array etc.

According to Doctrine docs usually id field is defined separately from other fields like this:

App\Resources\Domain\Stage:
  type: entity
  table: products
  id:
    id:
      type: integer
      generator:
        strategy: AUTO
  fields:
    name:
      type: string
manyToOne:
    educationalAreaId:
        targetEntity: EducationalArea
        joinColumn:
            name: educationalAreaId
            referencedColumnName: id

As it said in docs: "It has a generator tag nested inside, which specifies that the primary key generation mechanism should automatically use the database platform's native id generation strategy".

But you can find other strategies here .

So you can try this:

App\Resources\Domain\Stage:
  type: entity
  table: products
  id:
    id:
      type: string
      length: 36
      generator:
        strategy: UUID
...

In my case I use annotations and it works fine:

/**
 * @var string
 * @ORM\Column(name="id", type="string", length=36, options={"fixed":true})
 * @ORM\Id
 * @ORM\GeneratedValue(strategy="UUID")
 */
private $id;