onetomultipleimage 1.0.4

convert one image to several sizes in django REST and django models

onetomultipleimage

onetomultipleimage is a django package to convert one image to specified sizes. it can be used in REST or django model.

installation

1- run: pip install onetomultipleimage[jalali]

To install onetomultipleimage with Jalali date support, add [jalali] part.
IMAGES_PATH_TYPE='jalali' in settings.py, now jalali date path used (instead default gregorian) like:
/media/FatherImage/1401/12/13/small.jpg instead of: /media/FatherImage/2023/3/4/small.jpg

2- to install onetomultipleimage models, add 'onetomultipleimage' to INSTALLED_APPS of project's settings.py after makemigrations and migrate, models will be created.

 

Serializer Field: OneToMultipleImage

Receives image in Base64/form-data with list of sizes and generate images with specified sizes.

OneToMultipleImage arguments:

• sizes: list of sizes in str. for generate original image use 'default'. required in writing.

• upload_to: path in str for uploads image. required in writing.

• data: it is same data pass to serializer in writing, but structure should be:
  {'image': formdata_file/Base64_str, 'alt': 'some_alt'}

  • image key is required. can be formdata file or Base64 str.
  • alt is optional and will fill auto if left blank.

example 1:

from onetomultipleimage.field import OneToMultipleImage
image = request.FILES['image']
serializer = OneToMultipleImage(sizes=['120', '240', 'default'], data={'image': image})
serializer.is_valid()
s.validated_data

.validated_data here returns 3 object with 120px height, 240px height, and default (original) image sizes. validated_data returns like:
{'image': [<Upload object 1e2813-120 - (.image .url .alt .size)>, <Upload object 1e2813-240 - (.image .url .alt .size)>, <Upload object 1e2813-default - (.image .url .alt .size)>]}

 
OneToMultipleImage can use inside a serializer.
example 2:

class PostSerializer(serializers.Serializer):
    image = OneToMultipleImage(sizes=['120', '240', 'default'])

data = {'image': {'image': "data:image/jpeg;base64,/9j/..."}}  # image in Base64 (str)
serializer = PostSerializer(data=data)
serializer.is_valid()
s.validated_data

same result...

 

onetomultipleimage models

if you need django model for one-to-multy process, you have to add onetomultipleimage to INSTALLED_APPS. after migrate, you have two table FatherImage, ImageSizes.

FatherImage model

Store original image. attributes:

• image: django ImageField. upload_to path is: 'FatherImage/year/month/day' but can override directly before model initializing.
• alt: django CharField, represent image's alt, you can leave it blank to auto generating by uuid.uuid4
• sizes: custom ListCharField, represent lists of sizes you want to create them. (like: ['120', '240'])

 

ImageSizes

Stores different sizes of original image. attributes:

• image: django ImageField. upload_to path is: 'ImageSizes/year/month/day' but can override directly before model initializing.
• alt: django CharField, represent image's alt, you can leave it blank to auto generating by uuid.uuid4
• size: django CharField, represent size of image (in str).
• father: django ForeignKey, reference to FatherImage. (FatherImage.imagesizes in reverse relation is accecible)

example 1:

image = FatherImage(image=request.FILES['image'], sizes=['120', '240', '480'])
image.save()

now fatherimage and 3 imagesizes with 120, 240, 480 PXs is created. fatherimage.alt and imagesizes.alt auto generated like: 'db949e-default', ''db949z-120', ...

example 2:

image = FatherImage(image=request.FILES['image'], alt='sea_food', sizes=['120', '240', '480'])
image.save()

after .save, fatherimage and 3 imagesizes with 120, 240, 480 PXs is created. fatherimage.alt is like: 'sea_food-default'

image = FatherImage.objects.get(alt='sea_food-default')
image_sizes = image.imagesizes.all()

image_sizes contain 3 different size of original image. image_sizes[0].alt is like: 'sea_food-120', image_sizes[1].alt: 'sea_food-240', ...