python测试开发django-48.xadmin上传图片django-stdimage

前言

django经过自带的ImageField能够实现图片上传，若是想在列表页面也显示图片缩略图的话，能够用django-stdimage插件来实现

django-stdimage

django-stdimage的github文档地址https://github.com/codingjoe/django-stdimage

实现如下功能的Django Field：

• Django-Storages兼容（S3）
• 将图像调整为不一样大小
• 访问模型级别的缩略图，不须要模板标签
• 保留原始图像
• 异步渲染（Celery＆Co）
• 多线程和处理以得到最佳性能
• 限制接受的图像尺寸
• 将文件重命名为标准化名称（使用可调用的upload_to）

环境准备，直接经过pip安装,最新版本Version: 4.0.1

pip install django-stdimage

并加入'stdimage'到INSTALLED_APP在你的settings.py

在settings.py配置上传文件的目录地址，参考前面一篇http://www.javashuo.com/article/p-csoltdka-ck.html

MEDIA_URL = '/media/'

MEDIA_ROOT = os.path.join(BASE_DIR, 'media')

官方案例

变量在字典中指定。键将是引用已调整大小的图像的属性。变量能够定义为元组或字典。

from django.db import models
from stdimage.models import StdImageField


class MyModel(models.Model):
    # works just like django's ImageField
    image = StdImageField(upload_to='path/to/img')

    # creates a thumbnail resized to maximum size to fit a 100x75 area
    image = StdImageField(upload_to='path/to/img',
                          variations={'thumbnail': {'width': 100, 'height': 75}})

    # is the same as dictionary-style call
    image = StdImageField(upload_to='path/to/img', variations={'thumbnail': (100, 75)})

    # creates a thumbnail resized to 100x100 croping if necessary
    image = StdImageField(upload_to='path/to/img', variations={
        'thumbnail': {"width": 100, "height": 100, "crop": True}
    })

    ## Full ammo here. Please note all the definitions below are equal
    image = StdImageField(upload_to='path/to/img', blank=True, variations={
        'large': (600, 400),
        'thumbnail': (100, 100, True),
        'medium': (300, 200),
    })

用于在模板中使用生成的变量myimagefield.variation_name。如

<a href="{{ object.myimage.url }}"><img alt="" src="{{ object.myimage.thumbnail.url }}"/></a>

实践案例

经过上面的案例介绍，接下来写个实际的案例练习下

# models.py

from django.db import models
from django.utils import timezone
from datetime import datetime
from stdimage.models import StdImageField

# Create your models here.


class UploadImage(models.Model):
    '''上传图片功能'''
    name = models.CharField(max_length=30, verbose_name="名称", default="")   # 标题
    image = StdImageField(max_length=100,
                          upload_to='path/to',
                          verbose_name=u"传图片",
                          variations={'thumbnail': {'width': 100, 'height': 75}})
    # 时间可编辑
    add_time = models.DateTimeField(default=datetime.now, verbose_name=u"添加时间")


    def url(self):
        if self.image:
            return self.image.url
        else:
            return "url为空"

    def image_img(self):
        if self.image:
            href = self.image.url    # 点击后显示的放大图片
            src = self.image.thumbnail.url    # 页面显示的缩略图
            # 插入html代码
            image_html = '<a href="%s" target="_blank" title="传图片"><img alt="" src="%s"/>'%(href, src)
            return image_html
        else:
            return '上传图片'

    image_img.short_description = '图片'
    image_img.allow_tags = True     # 列表页显示图片

    class Meta:
        verbose_name = "传图片"
        verbose_name_plural = verbose_name

    def __str__(self):
        return self.name

adminx.py注册表信息

# adminx.py
import xadmin
from xadmin import views
from .models import  UploadImage


class ControlImage(object):
    # 显示不要用image，而应该用image_img
    list_display = ['name', 'image_img', 'url', 'add_time']

xadmin.site.register(UploadImage, ControlImage)

urls.py配置图片的URL地址访问，要否则查询详情的时候缩略图没法正常显示

from . import settings
from django.views.static import serve

urlpatterns = [

    url(r'^media/(?P<path>.*)$', serve, {"document_root": settings.MEDIA_ROOT}),

]

配置好以后，执行 makemigrations 和migrate，同步数据

python manage.py makemigrations
python manage.py migrate

xadmin后台显示

列表显示缩略图，点击能够放大

关于allow_tags的用法能够看下一篇http://www.javashuo.com/article/p-xpqrwvoh-q.html