Django easy_thumbnails 学习心得

一些 Django 的easy_thumbnails 的学习心得。

如果你不知道Django是什么，不知道easy_install是什么，请留步，别浪费时间往下读了。

GIt： https://github.com/SmileyChris/easy-thumbnails

model.py

class Images(models.Model):
    image = models.ImageField(upload_to='hello',blank=True)

admin.py:

admin.site.register(Images)

如果是用south管理数据库的，运行:

View Code

timest@timest-ThinkPad:~/django/pro$ python manage.py migrate easy_thumbnails
Running migrations for easy_thumbnails:
 - Migrating forwards to 0015_auto__del_unique_thumbnail_name_storage_hash__add_unique_thumbnail_sou.
 > easy_thumbnails:0001_initial
 > easy_thumbnails:0002_filename_indexes
 > easy_thumbnails:0003_auto__add_storagenew
 > easy_thumbnails:0004_auto__add_field_source_storage_new__add_field_thumbnail_storage_new
 > easy_thumbnails:0005_storage_fks_null
 > easy_thumbnails:0006_copy_storage
 - Migration 'easy_thumbnails:0006_copy_storage' is marked for no-dry-run.
 > easy_thumbnails:0007_storagenew_fks_not_null
 > easy_thumbnails:0008_auto__del_field_source_storage__del_field_thumbnail_storage
 > easy_thumbnails:0009_auto__del_storage
 > easy_thumbnails:0010_rename_storage
 > easy_thumbnails:0011_auto__add_field_source_storage_hash__add_field_thumbnail_storage_hash
 > easy_thumbnails:0012_build_storage_hashes
 - Migration 'easy_thumbnails:0012_build_storage_hashes' is marked for no-dry-run.
 > easy_thumbnails:0013_auto__del_storage__del_field_source_storage__del_field_thumbnail_stora
 > easy_thumbnails:0014_auto__add_unique_source_name_storage_hash__add_unique_thumbnail_name_s
 > easy_thumbnails:0015_auto__del_unique_thumbnail_name_storage_hash__add_unique_thumbnail_sou
 - Loading initial data for easy_thumbnails.
Installed 0 object(s) from 0 fixture(s)

否则运行:

python manager.py syncdb

settings.py:

THUMBNAIL_ALIASES = {
    '': {
        'avatar': {'size': (50, 50), 'crop': True},
        'avatar_nocorp': {'size': (50,50), 'crop':False},
        'big' : {'size': (200,200), 'crop':True},
        'big_nocorp' : {'size': (200,200), 'crop':False},
        'huge': {'size': (900,900), 'crop':True},
        'huge_nocorp': {'size': (900,900), 'crop':False},
    },
}

根据这个测试，就可以很明显的知道 crop 的作用！如果crop = False ，如果图片太大，就不剪裁但同比例缩小！可以传一张长的和一张高的看看效果。

文档上写着，图片的质量只要在settings.py 中加上 THUMBNAIL_QUALITY = 85 就行。但是本地上测试，20 和推荐的95 效果一样，而且图片大小也一样！

doc：

THUMBNAIL_QUALITY
Default: 85

The default quality level for JPG images on a scale from 1 (worst) to 95 (best). Technically, values up to 100 are allowed, but this is not recommended.

页面上显示：

<pre>
<img src="{{image.image|thumbnail_url:'avatar'}}" />
<img src="{{image.image|thumbnail_url:'avatar_nocorp'}}" />
<img src="{{image.image|thumbnail_url:'big'}}" />
<img src="{{image.image|thumbnail_url:'big_nocorp'}}" />
<img src="{{image.image|thumbnail_url:'huge'}}" />
<img src="{{image.image|thumbnail_url:'huge_nocorp'}}" />
</pre>

不需要在src前面加上 {{MEDIA_URL}} , 因为默认就是这个，如需修改，配置：THUMBNAIL_MEDIA_ROOT

doc：

THUMBNAIL_MEDIA_ROOT
Default: ''

Used by easy-thumbnail’s default storage to locate where thumbnails are stored on the file system.
If not provided, Django’s standard MEDIA_ROOT setting is used.

THUMBNAIL_MEDIA_URL
Default: ''

Used by easy-thumbnail’s default storage to build the absolute URL for a generated thumbnail.
If not provided, Django’s standard MEDIA_URL setting is used.

另外还有一种方法也很简约：

models.py:

from easy_thumbnails.fields import ThumbnailerImageField

class Imagess(models.Model):
    url = ThumbnailerImageField(upload_to='photos', blank=True)

前台显示：

<body bgcolor="#000">
{% load thumbnail %}
<pre>
<img src="{{ image.url.avatar.url}}" />
<img src="{{ image.url.avatar_nocorp.url}}" />
</pre>
</body>

posted @ 2012-09-04 10:24 timest 阅读(1065) 评论(0) 编辑收藏举报

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Django easy_thumbnails 学习心得

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