我面临一个与Django reversion 有点相反的问题，它不会保存在 shell 中所做的修订
正在使用的版本：
Django: v1.3.1
django-reversion: v1.5.7
我写了一个类，可以用来保存/放弃对模型所做的更改：
import reversion, datetime
class Execute:
model = None
delete_ids = []
def __init__(self, model):
self.model = model
if not reversion.is_registered(model):
reversion.register(model)
def update(self, n):
id = n.pk
if len(self.model.objects.filter(pk=id)) > 0:
m= self.model.objects.get(pk=id)
if len(reversion.get_for_object(m)) == 1: # Update newly inserted element
reversion.get_for_object(m).delete() # reversion list only 1 long.
with reversion.create_revision():
m=n
m.save()
else: # Update existing element. reversion list will be at least 2 long
if len(reversion.get_for_object(m)) == 0: # Add self as first revision.
with reversion.create_revision():
m.save()
with reversion.create_revision(): # Add updates
m=n
m.save()
def insert(self, n):
with reversion.create_revision():
n.pk = None
n.save()
return n.pk
def delete(self, n):
id = n.pk
if len(self.model.objects.filter(pk=id)) > 0:
m=self.model.objects.get(pk=id)
with reversion.create_revision():
m.save()
delete_ids.append(id)
m.delete()
def discard(self, n):
id = n.pk
if len(self.model.objects.filter(pk=id)) > 0:
m=self.model.objects.get(pk=id)
rev=reversion.get_for_object(m)
if len(rev) == 0:
return
if len(rev) == 1: #insert operation, then delete
m.delete()
else: #update operation, then revert
rev[len(rev)-1].revert()
rev.delete()
if len(reversion.get_deleted(self.model).filter(object_id=id)) > 0:
reversion.get_deleted(self.model).get(object_id=id).revert()
def save(self, n):
id = n.pk
if len(self.model.objects.filter(pk=id)) > 0:
m=self.model.objects.get(pk=id)
m.save()
reversion.get_for_object(m).delete()
if len(reversion.get_deleted(self.model).filter(object_id=id)) > 0:
reversion.get_deleted(self.model).get(object_id=id).delete()
然后我按如下方式使用它：
> my_execute=Execute(MyModel) m=MyModel.objects.get(pk=id)
>
> --modify something in m--
> my_execute.update(tm)
>
> --modify something else in m--
> my_execute.update(tm)
>
> --modify something else in m--
> my_execute.update(tm)
>
> my_execute.discard(tm) <-- Revert m to original
> or
> my_execute.save(tm) <-- Save new modifications
当我通过 shell 运行这些时，这非常有效，但在视图中通过 POST 请求运行时不一致。
在调试时，我发现基本上在 shell 中运行时，每次我注册的模型执行“save()”时，我都会看到列表“reversion.get_for_object(m)”按预期添加了一个新版本。但是当我通过 Django 视图运行相同的操作时，列表没有按预期更新，但似乎只有在到达视图代码结束时才会发生。
例如：当我更新现有模型时，我希望看到两个条目，例如：
>>> reversion.get_for_object(tm)
[]
>>> tm_execute.update(tm)
>>> reversion.get_for_object(tm)
[<Version: QGE__Power Sequencing fix__726__lalitb>, <Version: QGE__Power Sequencing fix__726__lalitb>]
>>>
但是，当我使用视图执行相同操作时：
from collabgrid.testmatrix.models import Testmatrix, Testcaseinfo, Product
from django.http import HttpResponse
from django.utils import simplejson
import json, pdb, datetime, reversion
class Execute:
model = None
delete_ids = []
def __init__(self, model):
self.model = model
if not reversion.is_registered(model):
reversion.register(model)
def update(self, n):
id = n.pk;
if len(self.model.objects.filter(pk=id)) > 0:
m= self.model.objects.get(pk=id)
if len(reversion.get_for_object(m)) == 1: # Update newly inserted element
reversion.get_for_object(m).delete() # reversion list only 1 long.
with reversion.create_revision():
m=n
m.save()
else: # Update existing element. reversion list will be at least 2 long
if len(reversion.get_for_object(m)) == 0: # Add self as first revision.
with reversion.create_revision():
m.save()
with reversion.create_revision(): # Add updates
m=n
m.save()
def insert(self, n):
with reversion.create_revision():
n.pk = None
n.save()
return n.pk
def delete(self, n):
id = n.pk
if len(self.model.objects.filter(pk=id)) > 0:
m=self.model.objects.get(pk=id)
with reversion.create_revision():
m.save()
delete_ids.append(id)
m.delete()
def discard(self, n):
id = n.pk
if len(self.model.objects.filter(pk=id)) > 0:
m=self.model.objects.get(pk=id)
rev=reversion.get_for_object(m)
if len(rev) == 0:
return
if len(rev) == 1: #insert operation, then delete
m.delete()
else: #update operation, then revert
rev[len(rev)-1].revert()
rev.delete()
if len(reversion.get_deleted(self.model).filter(object_id=id)) > 0:
reversion.get_deleted(self.model).get(object_id=id).revert()
def save(self, n):
id = n.pk
if len(self.model.objects.filter(pk=id)) > 0:
m=self.model.objects.get(pk=id)
m.save()
reversion.get_for_object(m).delete()
if len(reversion.get_deleted(self.model).filter(object_id=id)) > 0:
reversion.get_deleted(self.model).get(object_id=id).delete()
tm_execute=Execute(Testmatrix)
def update_sub_col(request):
print request
if request.method == 'POST':
ret = request.POST
tm_data = json.loads(request.POST['tm_data'])
for t in tm_data:
if(len(Testmatrix.objects.filter(pk=t['id'])) > 0):
tm = Testmatrix.objects.get(pk=t['id'])
if tm.os != t['sub_col']:
tm.os = t['sub_col']
print "BEFORE: ", reversion.get_for_object(tm) # List returns as empty []
tm_execute.update(tm)
print "AFTER: ",reversion.get_for_object(tm) # List returns as empty []
# but subsequent read has one
# revision entry.
json_response = {
'ret': 'success'
}
return HttpResponse(simplejson.dumps(json_response),mimetype='application/javascript')
在随后的阅读中，我看到该列表只有一个长：
[<Version: QGE__Power Sequencing fix__726__lalitb>]
此时模型会提交所有修改，并且无法将其还原。不知道为什么会有差异，因为我在两种情况下都使用相同的代码。
之后我什至使用 pdb 检查修订列表内容
with reversion.create_revision():
m.save()
当我通过视图运行时通过更新功能时它是空的，但在通过 shell 提示符调试时正确显示修订条目。