Sérialiseurs imbriqués avec django-rest-framework

Question

J'essaie de générer une sortie imbriquée Json en utilisant django-rest-framework. Mais ne peut pas trouver le bon chemin à parcourir ...

Quelqu'un peut-il me conduire à corriger la direction? Merci beaucoup!

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Voici mes modèles:

class Pacmr(models.Model): 
    package   = models.ForeignKey(Package) 
    architecture = models.ForeignKey(Architecture) 
    component  = models.ForeignKey(Component) 
    mirror   = models.ForeignKey(Mirror) 
    release   = models.ForeignKey(Release) 
    version   = DebVersionField() 

Package, Architecture, Component, Mirror, Release sont tous équivalents à:

class Package(models.Model): 
    name = models.CharField(max_length=50) 
    comment = models.CharField(max_length=200) 

Un exemple du contenu de la table Pacmr :

SELECT id, package_id, architecture_id, component_id, mirror_id, release_id, version from pacmr_pacmr where package_id = 20671; 

    id | package_id | architecture_id | component_id | mirror_id | release_id | version 
--------+------------+-----------------+--------------+-----------+------------+-------------- 
965201 |  20671 |    236 |   146 |  73 |  111 | 3.0-2.1b-1 
965200 |  20671 |    236 |   146 |  73 |  109 | 3.0-2.1b-2.1 
965199 |  20671 |    236 |   146 |  73 |  113 | 3.0-2.1a-5 
691277 |  20671 |    236 |   146 |  73 |  105 | 3.0-2.1b-3 
691276 |  20671 |    236 |   146 |  73 |  107 | 3.0-2.1b-3 
691275 |  20671 |    236 |   146 |  73 |  104 | 3.0-2.1b-3 
691274 |  20671 |    236 |   146 |  75 |  113 | 3.0-2.1a-5 
691273 |  20671 |    236 |   146 |  72 |  111 | 3.0-2.1b-1 
691272 |  20671 |    236 |   146 |  72 |  110 | 3.0-2.1b-1 
691271 |  20671 |    236 |   146 |  72 |  109 | 3.0-2.1b-2.1 
691270 |  20671 |    236 |   146 |  72 |  108 | 3.0-2.1b-2.1 
691269 |  20671 |    236 |   146 |  72 |  113 | 3.0-2.1a-5 
691268 |  20671 |    236 |   146 |  72 |  115 | 3.0-2.1a-5 
691267 |  20671 |    236 |   146 |  72 |  107 | 3.0-2.1b-3 
691266 |  20671 |    236 |   146 |  72 |  106 | 3.0-2.1b-3 
691265 |  20671 |    236 |   146 |  72 |  104 | 3.0-2.1b-3 
691264 |  20671 |    236 |   146 |  72 |  103 | 3.0-2.1b-3 
691263 |  20671 |    236 |   144 |  71 |   97 | 3.0-2.1b-2.1 
691262 |  20671 |    236 |   144 |  71 |   67 | 3.0-2.1b-3 
691261 |  20671 |    236 |   144 |  71 |  114 | 3.0-2.1b-3 
691260 |  20671 |    236 |   144 |  71 |   68 | 3.0-2.1b-3 
691259 |  20671 |    236 |   144 |  71 |  101 | 3.0-2.1b-3 
691258 |  20671 |    236 |   144 |  71 |  100 | 3.0-2.1b-3 
691257 |  20671 |    236 |   144 |  70 |   97 | 3.0-2.1b-2.1 
691256 |  20671 |    236 |   144 |  70 |   98 | 3.0-2.1b-2.1 
691255 |  20671 |    236 |   144 |  70 |   67 | 3.0-2.1b-3 
691254 |  20671 |    236 |   144 |  70 |   99 | 3.0-2.1b-3 
691253 |  20671 |    236 |   144 |  70 |   68 | 3.0-2.1b-3 
691252 |  20671 |    236 |   144 |  70 |   96 | 3.0-2.1b-3 

Avec joint ressembler à ceci:

SELECT pacmr_pacmr.id as id, pacmr_package.name as package, pacmr_architecture.name as architecture, pacmr_component.name as component, pacmr_mirror.name as mirror, pacmr_release.name as release, version from pacmr_pacmr, pacmr_package, pacmr_architecture, pacmr_component, pacmr_mirror, pacmr_release where package_id=pacmr_package.id and architecture_id=pacmr_architecture.id and component_id=pacmr_component.id and mirror_id=pacmr_mirror.id and release_id=pacmr_release.id and package_id = 20671; 

    id | package | architecture | component |  mirror  |  release  | version 
--------+---------+--------------+-----------+-------------------+-----------------+-------------- 
965201 | jvim | source  | main  | debian   | etch   | 3.0-2.1b-1 
965200 | jvim | source  | main  | debian   | lenny   | 3.0-2.1b-2.1 
965199 | jvim | source  | main  | debian   | sarge   | 3.0-2.1a-5 
691277 | jvim | source  | main  | debian   | sid    | 3.0-2.1b-3 
691276 | jvim | source  | main  | debian   | squeeze   | 3.0-2.1b-3 
691275 | jvim | source  | main  | debian   | wheezy   | 3.0-2.1b-3 
691274 | jvim | source  | main  | debian-amd64  | sarge   | 3.0-2.1a-5 
691273 | jvim | source  | main  | debian-production | etch   | 3.0-2.1b-1 
691272 | jvim | source  | main  | debian-production | etch-testing | 3.0-2.1b-1 
691271 | jvim | source  | main  | debian-production | lenny   | 3.0-2.1b-2.1 
691270 | jvim | source  | main  | debian-production | lenny-testing | 3.0-2.1b-2.1 
691269 | jvim | source  | main  | debian-production | sarge   | 3.0-2.1a-5 
691268 | jvim | source  | main  | debian-production | sarge-testing | 3.0-2.1a-5 
691267 | jvim | source  | main  | debian-production | squeeze   | 3.0-2.1b-3 
691266 | jvim | source  | main  | debian-production | squeeze-testing | 3.0-2.1b-3 
691265 | jvim | source  | main  | debian-production | wheezy   | 3.0-2.1b-3 
691264 | jvim | source  | main  | debian-production | wheezy-testing | 3.0-2.1b-3 
691263 | jvim | source  | universe | ubuntu   | hardy   | 3.0-2.1b-2.1 
691262 | jvim | source  | universe | ubuntu   | lucid   | 3.0-2.1b-3 
691261 | jvim | source  | universe | ubuntu   | oneiric   | 3.0-2.1b-3 
691260 | jvim | source  | universe | ubuntu   | precise   | 3.0-2.1b-3 
691259 | jvim | source  | universe | ubuntu   | quantal   | 3.0-2.1b-3 
691258 | jvim | source  | universe | ubuntu   | raring   | 3.0-2.1b-3 
691257 | jvim | source  | universe | ubuntu-production | hardy   | 3.0-2.1b-2.1 
691256 | jvim | source  | universe | ubuntu-production | hardy-testing | 3.0-2.1b-2.1 
691255 | jvim | source  | universe | ubuntu-production | lucid   | 3.0-2.1b-3 
691254 | jvim | source  | universe | ubuntu-production | lucid-testing | 3.0-2.1b-3 
691253 | jvim | source  | universe | ubuntu-production | precise   | 3.0-2.1b-3 
691252 | jvim | source  | universe | ubuntu-production | precise-testing | 3.0-2.1b-3 
(29 rows) 

Voici un exemple de ce que je voudrais avoir avec django-rest-framework (écrit à la main):

{ 
    "package_id": 20671, 
    "package": "jvim", 
    "mirrors": [ 
     { 
      "name": "debian", 
      "components": [ 
       { 
        "name": "main", 
        "releases": [ 
         { 
          "name": "etch", 
          "version": "3.0-2.1b-1" 
         }, 
         { 
          "name": "lenny", 
          "version": "3.0-2.1b-2.1" 
         }, 
         { 
          "name": "sarge", 
          "version": "3.0-2.1a-5" 
         }, 
         { 
          "name": "sid", 
          "version": "3.0-2.1b-3" 
         }, 
         { 
          "name": "squeeze", 
          "version": "3.0-2.1b-3" 
         }, 
         { 
          "name": "wheezy", 
          "version": "3.0-2.1b-3" 
         } 
        ] 
       } 
      ] 
     }, 
     { 
      "name": "debian-amd64", 
      "components": [ 
       { 
        "name": "main", 
        "releases": [ 
         { 
          "name": "sarge", 
          "version": "3.0-2.1a-5" 
         } 
        ] 
       } 
      ] 
     }, 
     { 
      "name": "debian-production", 
      "components": [ 
       { 
        "name": "main", 
        "releases": [ 
         { 
          "name": "etch", 
          "version": "3.0-2.1a-5" 
         }, 
         { 
          "name": "etch-testing", 
          "version": "3.0-2.1a-5" 
         }, 
         { 
          "name": "lenny", 
          "version": "3.0-2.1a-5" 
         }, 
         { 
          "name": "lenny-testing", 
          "version": "3.0-2.1a-5" 
         }, 
         { 
          "name": "sarge", 
          "version": "3.0-2.1a-5" 
         }, 
         { 
          "name": "sarge-testing", 
          "version": "3.0-2.1a-5" 
         }, 
         { 
          "name": "squeeze", 
          "version": "3.0-2.1a-5" 
         }, 
         { 
          "name": "squeeze-testing", 
          "version": "3.0-2.1a-5" 
         }, 
         { 
          "name": "wheezy", 
          "version": "3.0-2.1a-5" 
         }, 
         { 
          "name": "wheezy-testing", 
          "version": "3.0-2.1a-5" 
         } 
        ] 
       } 
      ] 
     }, 
     { 
      "name": "ubuntu", 
      "components": [ 
       { 
        "name": "universe", 
        "releases": [ 
         { 
          "name": "hardy", 
          "version": "3.0-2.1b-2.1" 
         }, 
         { 
          "name": "lucid", 
          "version": "3.0-2.1b-3" 
         }, 
         { 
          "name": "oneiric", 
          "version": "3.0-2.1b-3" 
         }, 
         { 
          "name": "precise", 
          "version": "3.0-2.1b-3" 
         }, 
         { 
          "name": "quantal", 
          "version": "3.0-2.1b-3" 
         }, 
         { 
          "name": "raring", 
          "version": "3.0-2.1b-3" 
         } 
        ] 
       } 
      ] 
     }, 
     { 
      "name": "ubuntu-production", 
      "components": [ 
       { 
        "name": "universe", 
        "releases": [ 
         { 
          "name": "hardy", 
          "version": "3.0-2.1b-2.1" 
         }, 
         { 
          "name": "hardy-testing", 
          "version": "3.0-2.1b-2.1" 
         }, 
         { 
          "name": "lucid", 
          "version": "3.0-2.1b-3" 
         }, 
         { 
          "name": "lucid-testing", 
          "version": "3.0-2.1b-3" 
         }, 
         { 
          "name": "precise", 
          "version": "3.0-2.1b-3" 
         }, 
         { 
          "name": "precise-testing", 
          "version": "3.0-2.1b-3" 
         } 
        ] 
       } 
      ] 
     } 
    ] 
} 

Answer 1

réponse moi-même ...

Trouvé une solution basée sur Django REST framework: non-model serializer

Peut-être qu'une meilleure solution pourrait être mise en œuvre?

class Pmcra(object): 
    package = None 
    package_id = None 

    def __init__(self, package, *args, **kw): 
     self.package = package 
     pass 

    def do_work(self): 

     my_dict = {} 

     if self.package: 
      pacmrs = Pacmr.objects.filter(package__name=self.package) 
      mirrors = pacmrs.all().distinct('mirror') 
      mirrors_array = [] 
      for mirror in mirrors: 
       self.package_id = mirror.package.id 
       components = mirrors.filter(mirror=mirror.mirror).distinct('component') 
       components_array = [] 
       for component in components: 
        releases = components.filter(component=component.component).distinct('release') 
        releases_array = [] 
        for release in releases: 
         releases_array.append({'name': release.release.__str__(), 'version': release.version.__str__() }) 
        components_array.append({'name': component.component.__str__(), 'releases': releases_array}) 
       mirrors_array.append({'name': mirror.mirror.__str__(), 'components': components_array}) 

      return { 'package': self.package, 'package_id': self.package_id, 'mirrors': mirrors_array } 


class MyView(APIView): 

    def get(self, request, *args, **kw): 
     # Process any get params that you may need 
     # If you don't need to process get params, 
     # you can skip this part 
     get_arg1 = request.GET.get('pkg', None) 

     # Any URL parameters get passed in **kw 
     myClass = Pmcra(get_arg1, *args, **kw) 
     result = myClass.do_work() 
     response = Response(result, status=status.HTTP_200_OK) 
     return response