kopia lustrzana https://github.com/wagtail/wagtail
81 wiersze
2.2 KiB
ReStructuredText
81 wiersze
2.2 KiB
ReStructuredText
.. _custom_image_model:
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===================
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Custom image models
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===================
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The ``Image`` model can be customised, allowing additional fields to be added
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to images.
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To do this, you need to add two models to your project:
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- The image model itself that inherits from
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``wagtail.images.models.AbstractImage``. This is where you would add
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your additional fields
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- The renditions model that inherits from
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``wagtail.images.models.AbstractRendition``. This is used to store
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renditions for the new model.
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Here's an example:
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.. code-block:: python
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# models.py
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from django.db import models
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from wagtail.images.models import Image, AbstractImage, AbstractRendition
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class CustomImage(AbstractImage):
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# Add any extra fields to image here
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# eg. To add a caption field:
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# caption = models.CharField(max_length=255, blank=True)
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admin_form_fields = Image.admin_form_fields + (
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# Then add the field names here to make them appear in the form:
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# 'caption',
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)
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class CustomRendition(AbstractRendition):
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image = models.ForeignKey(CustomImage, on_delete=models.CASCADE, related_name='renditions')
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class Meta:
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unique_together = (
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('image', 'filter_spec', 'focal_point_key'),
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)
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.. versionchanged:: 2.9
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Fields on a custom image model can now be defined as required (``blank=False``).
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Then set the ``WAGTAILIMAGES_IMAGE_MODEL`` setting to point to it:
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.. code-block:: python
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WAGTAILIMAGES_IMAGE_MODEL = 'images.CustomImage'
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.. topic:: Migrating from the builtin image model
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When changing an existing site to use a custom image model, no images will
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be copied to the new model automatically. Copying old images to the new
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model would need to be done manually with a
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:ref:`data migration <django:data-migrations>`.
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Any templates that reference the builtin image model will still continue to
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work as before but would need to be updated in order to see any new images.
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.. _custom_image_model_referring_to_image_model:
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Referring to the image model
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============================
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.. module:: wagtail.images
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.. autofunction:: get_image_model
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.. autofunction:: get_image_model_string
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