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from io import BytesIO |
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from django.core.files.base import ContentFile |
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from django.core.files.storage import FileSystemStorage |
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from django.db import models |
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from django.db.models.signals import post_delete, pre_save |
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from PIL import Image |
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from stdimage import StdImageField |
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from stdimage.models import StdImageFieldFile |
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from stdimage.utils import ( |
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UploadTo, UploadToAutoSlugClassNameDir, UploadToUUID, |
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pre_delete_delete_callback, pre_save_delete_callback, render_variations |
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) |
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from stdimage.validators import MaxSizeValidator, MinSizeValidator |
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class SimpleModel(models.Model): |
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"""works as ImageField""" |
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image = StdImageField(upload_to='img/') |
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class AdminDeleteModel(models.Model): |
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"""can be deleted through admin""" |
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image = StdImageField( |
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upload_to=UploadTo(name='image', path='img'), |
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blank=True |
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) |
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class ResizeModel(models.Model): |
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"""resizes image to maximum size to fit a 640x480 area""" |
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image = StdImageField( |
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upload_to=UploadTo(name='image', path='img'), |
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variations={ |
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'medium': {'width': 400, 'height': 400}, |
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'thumbnail': (100, 75), |
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} |
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) |
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class ResizeCropModel(models.Model): |
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"""resizes image to 640x480 cropping if necessary""" |
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image = StdImageField( |
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upload_to=UploadTo(name='image', path='img'), |
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variations={'thumbnail': (150, 150, True)} |
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) |
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class ThumbnailModel(models.Model): |
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"""creates a thumbnail resized to maximum size to fit a 100x75 area""" |
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image = StdImageField( |
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upload_to=UploadTo(name='image', path='img'), |
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blank=True, |
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variations={'thumbnail': (100, 75)} |
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) |
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class MaxSizeModel(models.Model): |
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image = StdImageField( |
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upload_to=UploadTo(name='image', path='img'), |
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validators=[MaxSizeValidator(16, 16)] |
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) |
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class MinSizeModel(models.Model): |
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image = StdImageField( |
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upload_to=UploadTo(name='image', path='img'), |
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validators=[MinSizeValidator(200, 200)] |
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) |
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class ForceMinSizeModel(models.Model): |
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"""creates a thumbnail resized to maximum size to fit a 100x75 area""" |
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image = StdImageField( |
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upload_to=UploadTo(name='image', path='img'), |
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force_min_size=True, |
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variations={'thumbnail': (600, 600)} |
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) |
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class AutoSlugClassNameDirModel(models.Model): |
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name = models.CharField(max_length=50) |
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image = StdImageField( |
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upload_to=UploadToAutoSlugClassNameDir(populate_from='name') |
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) |
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class UUIDModel(models.Model): |
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image = StdImageField(upload_to=UploadToUUID(path='img')) |
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class CustomManager(models.Manager): |
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"""Just like Django's default, but a different class.""" |
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pass |
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class CustomManagerModel(models.Model): |
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customer_manager = CustomManager() |
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class Meta: |
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abstract = True |
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class ManualVariationsModel(CustomManagerModel): |
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"""delays creation of 150x150 thumbnails until it is called manually""" |
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image = StdImageField( |
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upload_to=UploadTo(name='image', path='img'), |
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variations={'thumbnail': (150, 150, True)}, |
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render_variations=False |
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) |
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class MyStorageModel(CustomManagerModel): |
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"""delays creation of 150x150 thumbnails until it is called manually""" |
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image = StdImageField( |
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upload_to=UploadTo(name='image', path='img'), |
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variations={'thumbnail': (150, 150, True)}, |
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storage=FileSystemStorage(), |
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) |
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def render_job(**kwargs): |
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render_variations(**kwargs) |
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return False |
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class UtilVariationsModel(models.Model): |
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"""delays creation of 150x150 thumbnails until it is called manually""" |
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image = StdImageField( |
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upload_to=UploadTo(name='image', path='img'), |
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variations={'thumbnail': (150, 150, True)}, |
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render_variations=render_job |
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) |
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class ThumbnailWithoutDirectoryModel(models.Model): |
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"""Save into a generated filename that does not contain any '/' char""" |
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image = StdImageField( |
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upload_to=lambda instance, filename: 'custom.gif', |
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variations={'thumbnail': {'width': 150, 'height': 150}}, |
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) |
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def custom_render_variations(file_name, variations, storage, replace=False): |
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"""Resize image to 100x100.""" |
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for _, variation in variations.items(): |
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variation_name = StdImageFieldFile.get_variation_name( |
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file_name, |
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variation['name'] |
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) |
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if storage.exists(variation_name): |
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storage.delete(variation_name) |
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with storage.open(file_name) as f: |
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with Image.open(f) as img: |
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size = 100, 100 |
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img = img.resize(size) |
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with BytesIO() as file_buffer: |
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img.save(file_buffer, 'JPEG') |
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f = ContentFile(file_buffer.getvalue()) |
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storage.save(variation_name, f) |
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return False |
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168
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class CustomRenderVariationsModel(models.Model): |
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"""Use custom render_variations.""" |
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image = StdImageField( |
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upload_to=UploadTo(name='image', path='img'), |
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variations={'thumbnail': (150, 150)}, |
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render_variations=custom_render_variations, |
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) |
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post_delete.connect(pre_delete_delete_callback, sender=SimpleModel) |
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pre_save.connect(pre_save_delete_callback, sender=AdminDeleteModel) |
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codingjoe /
django-stdimage
