{"title":"Creat na cineálacha ábhair","version":"6.0","locale":"ga","docname":"ref/contrib/contenttypes","url":"/ga/6.0/ref/contrib/contenttypes/","canonical":"https://djangodocs.dev/ga/6.0/ref/contrib/contenttypes/","summary":"Cuimsíonn Django feidhmchlár a:mod: ~django.contrib.contenttypes atá in ann na samhlacha go léir atá suiteáilte i do thionscadal Django faoi thiomáint a rianú, ag…","html":"

Creat na cineálacha ábhairLink to this heading#

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Cuimsíonn Django feidhmchlár a:mod: ~django.contrib.contenttypes atá in ann na samhlacha go léir atá suiteáilte i do thionscadal Django faoi thiomáint a rianú, ag soláthar comhéadan cineálach ardleibhéil chun oibriú le do mhúnlaí.

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ForbhreathnúLink to this heading#

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I gcroílár an fheidhmchláir contenttypes tá an tsamhail:class: ~django.contrib.contentTypes.Models.contentType, a chónaíonn ag Django.Contrib.ContentTypes.Models.ContentType. Léiríonn agus stóráil cásanna de:class: ~django.contrib.contentTypes.Models.ContentType faisnéis faoi na samhlacha atá suiteáilte i do thionscadal, agus cruthaítear cásanna nua de:class: ~Django.Contrib.ContentTypes.Models.ContentType go huathoibríoch aon uair a shuiteáiltear samhlacha nua.

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Tá modhanna ag cásanna de:class: ~django.contrib.contentTypes.Models.ContentType chun na ranganna samhail a léiríonn siad a thabhairt ar ais agus chun rudaí a fhiosrú ó na samhlacha sin. :class: ~django.contrib.contentTypes.Models.contentType tá a:ref: bainisteoir saincheapaithe freisin a chuireann modhanna chun oibriú le:class: ~django.contrib.contentTypes.Models.contentType agus chun cásanna de:class: `~django.contrib.contentTypes.Models.contentType <custom-managers>`a fháil do mhúnla áirithe.

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Is féidir caidreamh idir do mhúnlaí agus:class: ~django.contrib.contentTypes.Models.contentType a úsáid freisin chun caidrimh “cineálacha” a chumasú idir sampla de cheann de do mhúnlaí agus cásanna d'aon mhúnla atá suiteáilte agat.

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Creat na cineálacha ábhair a shuiteáilLink to this heading#

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Tá an creat cineálacha ábhair san áireamh sa liosta réamhshocraithe:setting: INSTALLED_APPS a chruthaigh django-admin startproject, ach má bhain tú é nó má shocraigh tú do liosta:setting: INSTALLED_APPS de láimh, is féidir leat é a chumasú trí django.contrib.contenttypes' a chur le d':setting: INSTALLED_APPS `socrú.

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De ghnáth is smaoineamh maith é creat na cineálacha ábhair a shuiteáil; éilíonn roinnt d'fheidhmchláir cuabháilte eile Django é:

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An tsamhail ContentTypeLink to this heading#

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\nclass ContentTypeLink to this definition#
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Tá dhá réimse ag gach sampla de:class: ~django.contrib.contentTypes.Models.ContentType a chuireann, le chéile, cur síos uathúil ar mhúnla suiteáilte:

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\napp_labelLink to this definition#
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Ainm an fheidhmchláir tá an tsamhail mar chuid de. Tógtar é seo ó:attr: app_label tréith an tsamhail, agus ní chuimsíonn sé ach an cuid deireanaí* de chonair allmhairithe Python an fheidhmchláir; django.contrib.contenttypes, mar shampla, éiríonn u:attr: app_label de contenttypes`.

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\nmodelLink to this definition#
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Ainm an rang samhail.

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Ina theannta sin, tá an maoin seo a leanas ar fáil:

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\nnameLink to this definition#
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Ainm inléite don duine ar an gcineál ábhair. <django.db.models.Field.verbose_name>Tógtar é seo ón tréith: attr: `verbose_name `den tsamhail.

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Breathnaímid ar shampla chun a fheiceáil conas a oibríonn sé seo. Má tá an feidhmchlár: mod: ~django.contrib.contenttypes suiteáilte cheana féin, agus ansin cuir:mod: an feidhmchlár láithreáin `le do shuiteáil: `SET <django.contrib.sites>TING: `INSTALLED_APPS agus rith manage.py migrate chun é a shuiteáil, suiteálfar an samhail:class: Django.contrib.sites.models.site i do bhunachar sonraí. In éineacht leis cruthófar sampla nua de:class: ~django.contrib.contentTypes.Models.contentType leis na luachanna seo a leanas:

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Modhanna ar chásanna ContentTypeLink to this heading#

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Tá modhanna ag gach ceann: Class: ~django.contrib.contentTypes.Models.contentType a ligeann duit a fháil ó a:class: ~django.contrib.contentTypes.Models.contentType sampla don tsamhail a léiríonn sé, nó chun rudaí a aisghabháil ón tsamhail sin:

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\nContentType.get_object_for_this_type(using=None, **kwargs)Link to this definition#
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<django.db.models.query.QuerySet.get>Glacann sé tacar d'argóintí bail:ref: lookup <field-lookups-intro>`don tsamhail the:class: `~django.contrib.contentTypes.Models.contentType léiríonn, agus déanaim:meth: a get () cuardach ar an tsamhail sin, ag cur an réad comhfhreagrach ar ais. Is féidir an argóint ``úsáid ``a úsáid chun bunachar sonraí difriúil a shonrú ná an ceann réamhshocraithe.

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\nContentType.model_class()Link to this definition#
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Tugann sé an rang samhail a léiríonn this:class: ~django.contrib.contentTypes.Models.contentType sampla.

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Mar shampla, d'fhéadfaimis breathnú suas ar:class: ~django.contrib.contentTypes.Models.contentType don tsamhail:class: ~django.contrib.auth.models.user:

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Python console
>>> from django.contrib.contenttypes.models import ContentType\n>>> user_type = ContentType.objects.get(app_label="auth", model="user")\n>>> user_type\n<ContentType: user>\n
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Agus ansin bain úsáid as chun ceist a dhéanamh le haghaidh áirithe: class: ~django.contrib.auth.models.user, nó chun rochtain a fháil ar an rang samhail User:

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Python console
>>> user_type.model_class()\n<class 'django.contrib.auth.models.User'>\n>>> user_type.get_object_for_this_type(username="Guido")\n<User: Guido>\n
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Le chéile, cumasaíonn :meth: ~django.contrib.contenttypes.models.contenttype.get_object_for_this_type agus:meth: ~django.contrib.contenttypes.models.contenttype.model_class dhá chás úsáide thar a bheith tábhachtach:

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  1. Ag baint úsáide as na modhanna seo, is féidir leat cód cineálach ardleibhéil a scríobh a dhéanann ceisteanna ar aon mhúnla suiteáilte - in ionad rang samhail amháin a iompórtáil agus a úsáid, is féidir leat cuardach app_label agus model ``model` a chur isteach i a:class: ~django.contrib.contenttypes.models.contentType ag rith, agus ansin oibriú leis an rang samhail nó rudaí a aisghabháil uaidh.

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  2. Is féidir leat samhail eile a cheangal la:class: ~django.contrib.contentTypes.Models.contentType mar bhealach chun cásanna de a cheangal le ranganna samhail áirithe, agus na modhanna seo a úsáid chun rochtain a fháil ar na ranganna samhail sin.

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Baineann roinnt de na feidhmchláir cuabháilte Django úsáid as an teicníc deireanach sin. Mar shampla, :class: an córas ceadanna <django.contrib.auth.models.Permission>`i gcreat fíordheimhnithe Django úsáideann samhail a:class: `~django.contrib.auth.models.permission le eochair eachtrach chuig:class: ~django.contrib.contentTypes.Models.ContentType; is féidir leis an iontráil blog a chur leis” nó “is féidir scéal nuachta a scriosadh”.

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An ContentTypeManagerLink to this heading#

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\nclass ContentTypeManagerLink to this definition#
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ContentType also has a custom\nmanager, ContentTypeManager,\nwhich adds the following methods:

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\nclear_cache()Link to this definition#
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Clears an internal cache used by\nContentType to keep track\nof models for which it has created\nContentType instances. You\nprobably won't need to call this method in application code yourself;\nDjango will call it automatically when it's needed.

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You may need to clear the cache when testing, to reset between tests,\nor after preparing test state. For example:

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class ContentTypesTests(TestCase):\n    def setUp(self):\n        ContentType.objects.clear_cache()\n        self.addCleanup(ContentType.objects.clear_cache)\n
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\nget_for_id(id)Link to this definition#
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Cuardaigh a:class: ~django.contrib.contentTypes.Models.contentType de réir ID. Ós rud é go n-úsáideann an modh seo an taisce roinnte céanna amha:meth: ~django.contrib.contentTypes.Models.contentTypeManager.get_for_model, is fearr an modh seo a úsáid thar an `ContentType.Objects.get (pk=id) `is gnách

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\nget_for_model(model, for_concrete_model=True)Link to this definition#
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Tógann sé rang samhail nó sampla de mhúnla, agus filleann sé an sampla:class: ~django.contrib.contentTypes.Models.contentType a léiríonn an tsamhail sin. Ligeann for_concrete_model=False an: class: ~django.contrib.contentTypes.Models.contentType de mhúnla seachfhreastalaí a fháil.

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\nget_for_models(*models, for_concrete_models=True)Link to this definition#
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Glacann sé líon éagsúil ranganna samhail, agus cuireann sé foclóir ar ais ag mapáil na ranganna samhail chuig na cásanna: class: ~django.contrib.contentTypes.Models.contentType a léiríonn iad. for_concrete_models=False ceadaíonn an: class: ~django.contrib.contentTypes.Models.contentType de mhúnlaí seachfhreastalaí a fháil.

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\nget_by_natural_key(app_label, model)Link to this definition#
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Filleann sé an sampla:class: ~django.contrib.contentTypes.Models.contentType a aithnítear go uathúil ag an lipéad iarratais agus ainm an tsamhail. <topics-serialization-natural-keys>Is é príomhchuspóir an mhodha seo ná: class: ~django.contrib.contentTypes.Models.contentType rudaí le tagairt a thabhairt trí a:ref: `eochair nádúrtha `le linn dísheerialaithe.

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The get_for_model() method is especially\nuseful when you know you need to work with a\nContentType but don't\nwant to go to the trouble of obtaining the model's metadata to perform a manual\nlookup:

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>>> from django.contrib.auth.models import User\n>>> ContentType.objects.get_for_model(User)\n<ContentType: user>\n
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Caidreamh cineálachLink to this heading#

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Ag cur eochair eachtrach ó cheann de do mhúnlaí féin chuig: class: ~django.contrib.contentTypes.Models.ContentType is féidir le do mhúnla é féin a cheangal go héifeachtach le rang samhail eile, mar atá i sampla an tsamhail: ~django.contrib.auth.models.permission thuas. Ach is féidir dul céim amháin níos faide agus úsáid:class: ~django.contrib.contentTypes.Models.contentType chun caidrimh fíor-chineálacha (ar a dtugtar “polaimorfach” uaireanta) idir samhlacha a chumasú.

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Mar shampla, d'fhéadfaí é a úsáid le haghaidh córas clibeála mar seo:

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from django.contrib.contenttypes.fields import GenericForeignKey\nfrom django.contrib.contenttypes.models import ContentType\nfrom django.db import models\n\n\nclass TaggedItem(models.Model):\n    tag = models.SlugField()\n    content_type = models.ForeignKey(ContentType, on_delete=models.CASCADE)\n    object_id = models.PositiveBigIntegerField()\n    content_object = GenericForeignKey("content_type", "object_id")\n\n    def __str__(self):\n        return self.tag\n\n    class Meta:\n        indexes = [\n            models.Index(fields=["content_type", "object_id"]),\n        ]\n
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Ní féidir le gnáth:class: ~django.db.models.foreignKey ach “pointe” ar mhúnla amháin eile, rud a chiallaíonn má úsáideann an tsamhail TaggEditem a:class: ~Django.db.Models.ForeignKey bheadh air samhail amháin agus amháin a roghnú chun clibeanna a stóráil dó. Soláthraíonn an feidhmchlár contenttypes cineál réimse speisialta (GenericForeignKey) a oibríonn timpeall air seo agus a ligeann don chaidreamh a bheith le haon mhúnla:

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Tá trí chuid ann chun a: class a bhunú: ~django.contrib.contentTypes.Fields.GenericForeignKey:

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  1. Tabhair do mhúnla a:class: ~django.db.models.foreignKey chuig: class: ~django.contrib.contentTypes.Models.ContentType. Is é “content_type” an gnáthainm don réimse seo.

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  2. Give your model a field that can store primary key values from the\nmodels you'll be relating to. For most models, this means a\nPositiveBigIntegerField. The usual name\nfor this field is "object_id".

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  3. Tabhair do mhúnla a:class: ~django.contrib.contentTypes.Fields.GenericForeignKey, agus cuir ainmneacha an dá réimse a thuairiscítear thuas air. Má ainmnítear na réimsí seo “content_type” agus “object_id”, is féidir leat é seo a fhágáil - is iad sin na hainmneacha réimse réamhshocraithe: class: ~django.contrib.contentTypes.fields.GenericForeignKey a lorgfaidh.

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<django.db.models.Options.indexes>Murab ionann agus don: class: ~django.db.models.foreignKey, cruthaítear innéacs bunachar sonraí not go huathoibríoch ar:class: ~django.contrib.contentTypes.Fields.GenericForeignKey, mar sin moltar duit: attr: `Meta.Indexes `a úsáid chun d'innéacs colún iolrach féin a chur leis. An t-iompar seo: ticéad: `d'fhéadfadh athrú <23435>`sa todhchaí.

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Má tá False, beidh an réimse in ann samhlacha seachfhreastalaí a thagairt. Is é réamhshocraithe True. Léiríonn sé seo an argóint for_concrete_model chuig: meth: ~django.contrib.contentTypes.Models.contentTypeManager.get_for_model.

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Cuirfidh sé seo ar chumas API cosúil leis an gceann a úsáidtear le haghaidh gnáth:class: ~django.db.models.foreignKey; beidh réimse content_object ag gach TaggEditem` a thugann an réad a bhaineann leis, agus is féidir leat a shannadh don réimse sin nó é a úsáid agus TaggEditem` á chruthú:

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>>> from django.contrib.auth.models import User\n>>> guido = User.objects.get(username="Guido")\n>>> t = TaggedItem(content_object=guido, tag="bdfl")\n>>> t.save()\n>>> t.content_object\n<User: Guido>\n
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Má scriostar an réad gaolmhar, fanann na réimsí content_type agus object_id socraithe dá luachanna bunaidh agus filleann GenericForeignKey None:

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>>> guido.delete()\n>>> t.content_object  # returns None\n
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Mar gheall ar an mbealach:class: ~django.contrib.contentTypes.Fields.GenericForeignKey a chuirtear i bhfeidhm, ní féidir leat réimsí den sórt sin a úsáid go díreach le scagairí (filter () ``agus ``eisiamh ()`, mar shampla) tríd an API bunachar sonraí. Toisc nach gnáth-réad réimse é a:class: ~django.contrib.contentTypes.Fields.GenericForeignKey, ní oibreoidh na samplaí seo:

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# This will fail\n>>> TaggedItem.objects.filter(content_object=guido)\n# This will also fail\n>>> TaggedItem.objects.get(content_object=guido)\n
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Likewise, GenericForeignKeys\ndo not appear in ModelForms.

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Caidreamh cineálach ar aisLink to this heading#

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\nclass GenericRelationLink to this definition#
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\nrelated_query_nameLink to this definition#
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Níl an gaol ar an réad gaolmhar ar ais leis an réad seo ann de réir réamhshocraithe. Cruthaíonn socrú related_query_name gaol ón réad gaolmhar ar ais leis an gceann seo. Ligeann sé seo fiosrú agus scagadh ón réad gaolmhar.

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Má tá a fhios agat cé na samhlacha a bheidh á úsáid agat is minice, is féidir leat caidreamh cineálach “droim” a chur leis freisin chun API breise a chumasú. Mar shampla:

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from django.contrib.contenttypes.fields import GenericRelation\nfrom django.db import models\n\n\nclass Bookmark(models.Model):\n    url = models.URLField()\n    tags = GenericRelation(TaggedItem)\n
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Beidh tréith tags ag gach cás Leabharmharca, ar féidir iad a úsáid chun a TaggEditems` gaolmhara a aisghabháil:

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>>> b = Bookmark(url="https://www.djangoproject.com/")\n>>> b.save()\n>>> t1 = TaggedItem(content_object=b, tag="django")\n>>> t1.save()\n>>> t2 = TaggedItem(content_object=b, tag="python")\n>>> t2.save()\n>>> b.tags.all()\n<QuerySet [<TaggedItem: django>, <TaggedItem: python>]>\n
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Is féidir leat add () ``, `create (), nó ``set () ``a úsáid freisin chun caidrimh a chruthú:

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Python console
>>> t3 = TaggedItem(tag="Web development")\n>>> b.tags.add(t3, bulk=False)\n>>> b.tags.create(tag="Web framework")\n<TaggedItem: Web framework>\n>>> b.tags.all()\n<QuerySet [<TaggedItem: django>, <TaggedItem: python>, <TaggedItem: Web development>, <TaggedItem: Web framework>]>\n>>> b.tags.set([t1, t3])\n>>> b.tags.all()\n<QuerySet [<TaggedItem: django>, <TaggedItem: Web development>]>\n
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Scriosfaidh an glao ``remove () ``mórchóir na rudaí samhail sonraithe:

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>>> b.tags.remove(t3)\n>>> b.tags.all()\n<QuerySet [<TaggedItem: django>]>\n>>> TaggedItem.objects.all()\n<QuerySet [<TaggedItem: django>]>\n
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Is féidir an modh ``clear () ``a úsáid chun gach rud gaolmhara a scriosadh go mór mar shampla:

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>>> b.tags.clear()\n>>> b.tags.all()\n<QuerySet []>\n>>> TaggedItem.objects.all()\n<QuerySet []>\n
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Sainmhínithe:Class: ~django.contrib.contentTypes.Fields.GenericRelation le tacar related_query_name` ceadaíonn fiosrú ón réad gaolmhar:

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tags = GenericRelation(TaggedItem, related_query_name="bookmark")\n
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Cumasaíonn sé seo oibríochtaí scagtha, ordaithe agus fiosrúcháin eile ar Bookmark ``ó `TaggEditem:

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>>> # Get all tags belonging to bookmarks containing `django` in the url\n>>> TaggedItem.objects.filter(bookmark__url__contains="django")\n<QuerySet [<TaggedItem: django>, <TaggedItem: python>]>\n
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Mura gcuireann tú an related_query_name leis, is féidir leat na cineálacha céanna cuardaigh a dhéanamh de láimh:

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>>> bookmarks = Bookmark.objects.filter(url__contains="django")\n>>> bookmark_type = ContentType.objects.get_for_model(Bookmark)\n>>> TaggedItem.objects.filter(content_type__pk=bookmark_type.id, object_id__in=bookmarks)\n<QuerySet [<TaggedItem: django>, <TaggedItem: python>]>\n
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Díreach cosúil:class: ~django.contrib.contentTypes.Fields.GenericForeignKey glacann le hainmneacha na réimsí cineál ábhair agus Object-ID mar argóintí, mar sin freisin: class: ~django.contrib.contentTypes.Fields.GenericRelation; má tá an tsamhail a bhfuil an eochair eachtrach cineálach ag úsáid ainmneacha na réimsí sin, ní mór duit na n-ainmneacha a rith na réimsí agus a: aicme: .GenericRelation á bhunú leis. Mar shampla, má úsáideann an tsamhail TaggEditem dá dtagraítear thuas réimsí darb ainm content_type_fk` agus object_primary_key` chun a eochair eachtrach cineálach a chruthú, ansin caithfear a:class: .GenericRelation ar ais a shainiú mar sin:

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tags = GenericRelation(\n    TaggedItem,\n    content_type_field="content_type_fk",\n    object_id_field="object_primary_key",\n)\n
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Tabhair faoi deara freisin, má scriosann tú réad a bhfuil a:class: ~django.contrib.contentTypes.Fields.GenericRelation, scriosfar aon rudaí a bhfuil a:class: ~django.contrib.contentTypes.Fields.GenericForeignKey ag díriú air freisin. Sa sampla thuas, ciallaíonn sé seo dá scriosfaí réad Leabharmharc, go scriosfaí aon rudaí TaggEditem ag díriú air ag an am céanna.

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Unlike:class: ~Django.db.Models.ForeignKey, :class: ~django.contrib.contentTypes.fields.GenericForeignKey ní ghlacann argóint a:attr: ~django.db.models.foreignKey.on_delete chun an t-iompar seo a shaincheapadh; más mian leat, is féidir leat an cascade-scriosadh a sheachaint gan úsáid: class: ~django.contrib.contentTypes.Fields.GenericRelation, agus is féidir iompar malartach a sholáthar tríd an gcomhartha: data: ~django.db.models.signals.pre_delete.

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Caidreamh cineálach agus comhiomlánúLink to this heading#

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Django's database aggregation API works with a\nGenericRelation. For example, you\ncan find out how many tags all the bookmarks have:

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>>> Bookmark.objects.aggregate(Count("tags"))\n{'tags__count': 3}\n
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Gaol cineálach i bhfoirmeachaLink to this heading#

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Soláthraíonn an modúl:mod: django.contrib.contenttypes.forms:

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\nclass BaseGenericInlineFormSetLink to this definition#
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\ngeneric_inlineformset_factory(model, form=ModelForm, formset=BaseGenericInlineFormSet, ct_field='content_type', fk_field='object_id', fields=None, exclude=None, extra=3, can_order=False, can_delete=True, max_num=None, formfield_callback=None, validate_max=False, for_concrete_model=True, min_num=None, validate_min=False, absolute_max=None, can_delete_extra=True)Link to this definition#
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Tugann GenericInlineFormSet ar ais ag baint úsáid:func: ~django.forms.models.modelformset_factory.

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Ní mór duit ct_field agus fk_field a sholáthar má tá siad difriúil ó na réamhshocraithe, content_type agus object_id faoi seach. Tá paraiméadair eile cosúil leis na paraiméadair atá doiciméadaithe in:func: ~django.forms.models.modelformset_factory agus:func: ~django.forms.models.inlineformset_factory.

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Freagraíonn an argóint for_concrete_model` don argóint: ~django.contrib.contentTypes.Fields.GenericForeignKey.for_Concrete_Model ar GenericForeignKey`.

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Caidreamh cineálach i riarachánLink to this heading#

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Soláthraíonn an modúl:mod: django.contrib.contenttypes.admin :class: ~django.contrib.contentTypes.admin.GenericTabularInline agus:class: ~django.contrib.contentTypes.admin.GenericStackedInline (fo-aicm:class: `~Django.Contrib.ContentTypes.ContentTypes.GenericInlineModelAdmin `)

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Cuireann na ranganna agus na feidhmeanna seo ar chumas caidreamh cineálach a úsáid i bhfoirmeacha agus an riarachán. </topics/forms/modelforms> <using-generic-relations-as-an-inline>Féach an doiciméadach:doc: model formset agus:ref: `admin `le haghaidh tuilleadh eolais.

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\nclass GenericInlineModelAdminLink to this definition#
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Oidhreacht an aicme:Class: ~django.contrib.contentTypes.admin.GenericInlineModelAdmin gach airíonna ó aicme:class: ~django.contrib.admin.inlineModelAdmin aicme. Mar sin féin, cuireann sé cúpla ceann féin leis chun oibriú leis an ngaol cineálach:

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\nct_fieldLink to this definition#
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Ainm an: aicme: ~django.contrib.contentTypes.Models.contentType eochair réimse eachtrach ar an tsamhail. Réamhshocraithe go content_type.

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\nct_fk_fieldLink to this definition#
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Ainm an réimse sláimhir a léiríonn ID an réad gaolmhar. Réamhshocraithe go object_id.

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\nclass GenericTabularInlineLink to this definition#
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\nclass GenericStackedInlineLink to this definition#
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Fo-aicmí de:class: GenericInlineModelAdmin le leagan amach cruachta agus táblaí, faoi seach.

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``GenericPrefetch () ``Link to this heading#

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\nclass GenericPrefetch(lookup, querysets, to_attr=None)Link to this definition#
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Tá an cuardach seo cosúil le Prefetch () ``agus níor chóir é a úsáid ach ar ``GenericForeignKey. Glacann an argóint Querysets le liosta de na ceisteanna, gach ceann acu le haghaidh Contenttype difriúil. Tá sé seo úsáideach do GenericForeignKey` le sraith torthaí neamh-aonchineálach.

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Python console
>>> from django.contrib.contenttypes.prefetch import GenericPrefetch\n>>> bookmark = Bookmark.objects.create(url="https://www.djangoproject.com/")\n>>> animal = Animal.objects.create(name="lion", weight=100)\n>>> TaggedItem.objects.create(tag="great", content_object=bookmark)\n>>> TaggedItem.objects.create(tag="awesome", content_object=animal)\n>>> prefetch = GenericPrefetch(\n...     "content_object", [Bookmark.objects.all(), Animal.objects.only("name")]\n... )\n>>> TaggedItem.objects.prefetch_related(prefetch).all()\n<QuerySet [<TaggedItem: Great>, <TaggedItem: Awesome>]>\n
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