Django腳本添加字段到數據庫

Question

我添加了一個slug字段到我的數據庫，現在需要通過並添加這些。我想運行一個腳本來查看數據庫中的slug字段，如果爲空則生成並保存。這是我認爲是沿線，但沒有工作。

from project.apps.tracks.models import * 

def process_slug(): 
    if not track.slug: 
     slug = slugify("%s - %s" % (track.name, track.artist)) 
    else: 
     slug = "" 

    super(process_slug, track).save() 

Answer 1

從您發佈的代碼，這一點並不明顯，你實際上是通過你的所有Track對象循環。對於這種偶爾重複命令

from project.apps.tracks.models import Track 
# import for slugify 

def process_slug(): 
    """ Populate slug field, if they are empty. 
    """ 
    for track in Track.objects.all(): 
     if not track.slug: 
      slug = slugify("%s - %s" % (track.name, track.artist)) 
      track.slug = slug 
      track.save() 

一個優選的地方是management/commands你的應用程序中下。

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另一種方式來實現將覆蓋你的Track模型save方法。它會檢查每次保存時的emtpy slugs（這不是高性能的）。

Answer 2

可以這樣設置默認：

slug = models.SlugField(default=process_slug) 

Answer 3

添加打印語句的腳本，但沒有得到記錄。

from django.conf import settings 
from django.template.defaultfilters import slugify 

from project.apps.tracks.models import Track 

def process_slug(): 
    """ Populate slug field, if they are empty. 
    """ 
    for track in Track.objects.all(): 
     print "Trying to slugify" 
     if not track.slug: 
      print "slug = %s" 
      slug = slugify("%s %s" % (track.track, track.artist)) 
      track.slug = slug 
      track.save()