AWS S3 + 非同期サムネイル作成コトハジメ

# coding=utf8

from django.shortcuts import render, redirect

from .models import Entry
from .forms import EntryForm


def home(request):
    entries = Entry.objects.all()
    return render(request, 'rime/home.html', {'entries': entries})


def upload(request):
    if request.method == 'POST':
        form = EntryForm(request.POST, request.FILES)
        if form.is_valid():
            form.save()
            return redirect('/')
    else:
        form = EntryForm()
    return render(request, 'rime/upload.html', {'form': form})

project/core/models.py

# coding=utf8

from django.db import models

from imagekit.models import ImageSpecField
from imagekit.processors import ResizeToFill

class Entry(models.Model):
    title = models.CharField(max_length=255)
    img = models.ImageField(upload_to='entry/%Y/%m/%d')
    img_thumbnail = ImageSpecField(source='img',
                                   processors=[ResizeToFill(100, 50)],
                                   format='JPEG',
                                   options={'quality': 60})
    class Meta:
        ordering = ('title', )

    def __unicode__(self):
        return self.title

project/core/forms.py

# coding=utf8

from django import forms

from .models import Entry

class EntryForm(forms.ModelForm):
    class Meta:
        model = Entry

project/core/templates/core/home.html

{% for entry in entries %}
    <div><img src="{{ entry.img_thumbnail.url }}"><br></div>
{% endfor %}

project/core/templates/core/upload.html

<form action="/upload" method="post" enctype="multipart/form-data">{% csrf_token %}
    {% for field in form %}
        <div >
            {{ field.errors }}
            {{ field.label_tag }}: {{ field }}
        </div>
    {% endfor %}
    <p><input type="submit" value="アップロード" /></p>
</form>

project/core/settings.py

INSTALLED_APPS = (
    ...

    'djcelery',
    'imagekit',
    'storages',

    'core',
)

DEFAULT_FILE_STORAGE = 'core.s3.MediaRootS3BotoStorage'
STATICFILES_STORAGE = 'core.s3.StaticRootS3BotoStorage'

AWS_S3_SECURE_URLS = True
AWS_QUERYSTRING_AUTH = False

AWS_ACCESS_KEY_ID = ''
AWS_SECRET_ACCESS_KEY = ''
AWS_STORAGE_BUCKET_NAME = ''

IMAGEKIT_DEFAULT_FILE_STORAGE = DEFAULT_FILE_STORAGE
IMAGEKIT_DEFAULT_CACHEFILE_BACKEND = 'imagekit.cachefiles.backends.Async'

import djcelery
djcelery.setup_loader()

BROKER_URL = 'redis://localhost:6379/0'

project/core/s3.py

from storages.backends.s3boto import S3BotoStorage

StaticRootS3BotoStorage = lambda: S3BotoStorage(location='static')
MediaRootS3BotoStorage  = lambda: S3BotoStorage(location='media')

voluntas/django-s3-imagekit-celery.rst

AWS S3 + 非同期サムネイル作成 コトハジメ

AWS S3 + 非同期サムネイル作成コトハジメ