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fw:mongoengine
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| Ambos lados, revisión anterior Revisión previa Próxima revisión | Revisión previa | ||
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fw:mongoengine [2014/05/20 10:40] alfred [Editing Data] |
fw:mongoengine [2020/05/09 09:25] (actual) |
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| === Other field objects === | === Other field objects === | ||
| * ''tags = ListField(StringField(max_length=30))'', a ''ListField'' is a field object that allows to have a list of other field objects (including other lists). | * ''tags = ListField(StringField(max_length=30))'', a ''ListField'' is a field object that allows to have a list of other field objects (including other lists). | ||
| + | * ''date_modified = DateTimeField(default=datetime.datetime.now)'' | ||
| + | More about this subject in: [[http://docs.mongoengine.org/guide/defining-documents.html#fields]] | ||
| + | ==== Storing an object ==== | ||
| + | <code python> | ||
| + | Comment.objects.create(text='Me gusta!') | ||
| + | </code> | ||
| ==== Storing an object inside another ==== | ==== Storing an object inside another ==== | ||
| <code python> | <code python> | ||
| Línea 58: | Línea 63: | ||
| comments = ListField(EmbeddedDocumentField(Comment)) | comments = ListField(EmbeddedDocumentField(Comment)) | ||
| </code> | </code> | ||
| + | We also could use ''GenericReferenceField'' to reference any kind of document: | ||
| + | <code python> | ||
| + | class Bookmark(Document): | ||
| + | bookmark_object = GenericReferenceField() | ||
| + | </code> | ||
| ==== Cascade delete ==== | ==== Cascade delete ==== | ||
| When we define a ''ReferenceField'' we can indicate ''reverse_delete_rule=CASCADE'' to delete all the objects when a referenced object is deleted (it does not work with MapFields neither DictFields). | When we define a ''ReferenceField'' we can indicate ''reverse_delete_rule=CASCADE'' to delete all the objects when a referenced object is deleted (it does not work with MapFields neither DictFields). | ||
| Línea 68: | Línea 77: | ||
| comments = ListField(EmbeddedDocumentField(Comment)) | comments = ListField(EmbeddedDocumentField(Comment)) | ||
| </code> | </code> | ||
| + | Other constans we can pass: | ||
| + | * ''mongoengine.DO_NOTHING'' | ||
| + | * ''mongoengine.DENY'' | ||
| + | * ''mongoengine.NULLIFY'' | ||
| + | * ''mongoengine.CASCADE'' | ||
| + | * ''mongoengine.PULL'' | ||
| + | ==== Dynamic documents ==== | ||
| + | DynamicDocument documents work like Document but any data or attributes set to them will also be saved (fields cannot start with _ ). | ||
| + | <code> | ||
| + | from mongoengine import * | ||
| + | class Page(DynamicDocument): | ||
| + | title = StringField(max_length=200, required=True) | ||
| + | |||
| + | # Create a new page and add tags | ||
| + | page = Page(title='Using MongoEngine') | ||
| + | page.tags = ['mongodb', 'mongoengine'] | ||
| + | page.save() | ||
| + | </code> | ||
| + | ==== Defining constraints ==== | ||
| + | We can specify field uniqueness with ''unique=True'' and multi-fielduniqueness with ''unique_with'' (for a field name, or a list, or a tuple): | ||
| + | <code python> | ||
| + | class User(Document): | ||
| + | username = StringField(unique=True) | ||
| + | first_name = StringField() | ||
| + | last_name = StringField(unique_with='first_name') | ||
| + | </code> | ||
| ===== Editing Data ===== | ===== Editing Data ===== | ||
| ==== Adding documents ==== | ==== Adding documents ==== | ||
| Línea 110: | Línea 145: | ||
| for post in Post.objects(tags='mongodb'): | for post in Post.objects(tags='mongodb'): | ||
| print post.title | print post.title | ||
| + | </code> | ||
| + | |||
| + | ===== Others ===== | ||
| + | |||
| + | ==== Django support ==== | ||
| + | === Connecting === | ||
| + | You only need to call ''connect()'' somewhere in the settings module. | ||
| + | |||
| + | If you were not using another Database backend you may need to add a dummy database: | ||
| + | <code python> | ||
| + | DATABASES = { | ||
| + | 'default': { | ||
| + | 'ENGINE': 'django.db.backends.dummy' | ||
| + | } | ||
| + | } | ||
| + | </code> | ||
| + | |||
| + | === Users === | ||
| + | Django authentication classes are included as Document classes so they are compatible. To enable them you should add the following to your settings.py file: | ||
| + | <code python> | ||
| + | AUTHENTICATION_BACKENDS = ( | ||
| + | 'mongoengine.django.auth.MongoEngineBackend', | ||
| + | ) | ||
| + | </code> | ||
| + | Remember to call ''set_password()'' method in ''User'' class when assign a password value: | ||
| + | <code python> | ||
| + | instance.set_password(attrs.get('password', instance.password)) | ||
| </code> | </code> | ||
fw/mongoengine.1400582400.txt.gz · Última modificación: 2020/05/09 09:24 (editor externo)
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