def get_version_date(self, instance):
"""
Gets the datetime the instance was last modified. This default
implementation either uses the field specified by version_date_field
or grabs a DateTimeField with auto_now=True.
Override this method to customize how you want to determine the
version date.
"""
if hasattr(self, 'version_date_field'):
return getattr(instance, self.version_date_field)
# if using versioning, return most recent version date
if is_versioned(instance):
try:
return get_versions(instance).most_recent().version_info.date
except:
return ''
# no version_date_field specified, let's try to guess it
date_fields = [field for field in instance._meta.fields
if isinstance(field, models.DateTimeField) and
field.auto_now]
if date_fields:
return getattr(instance, date_fields[0].name) or ''
raise ValueError('MergeMixin cannot find a version_date_field')
def clean(self):
"""
Detects when the instance is newer than the one used to generate the
form. Calls merge() when there is a version conflict, and if there is
still an error, updates the version date in the form to give the user
a chance to save anyway.
Returns
cleaned_data.
Raises:
ValidationError: When there's a conflict when calling merge().
"""
self.cleaned_data = super(self.__class__.__base__, self).clean()
current_version_date = str(self.get_version_date(self.instance))
form_version_date = self.data['version_date']
if current_version_date != form_version_date:
ancestor = None
if is_versioned(self.instance) and form_version_date:
ancestor_model = get_versions(self.instance).as_of(
form_version_date)
ancestor = model_to_dict(ancestor_model)
try:
self.cleaned_data = self.merge(self.cleaned_data, self.initial,
ancestor)
except forms.ValidationError as e:
self.data = self.data.copy()
self.data['version_date'] = current_version_date
raise e
else:
# Note that we performed a merge, for use elsewhere.
self.performed_merge = True
return self.cleaned_data
def get_context_data(self, **kwargs):
context = super(CompareView, self).get_context_data(**kwargs)
if self.kwargs.get('date1'):
# Using datetimes to display diff.
date1 = self.kwargs.get('date1')
date2 = self.kwargs.get('date2')
# Query parameter list used in history compare view.
dates = self.request.GET.getlist('date')
if not dates:
dates = [v for v in (date1, date2) if v]
dates = [dateparser(v) for v in dates]
old = min(dates)
new = max(dates)
new_version = get_versions(self.object).as_of(date=new)
prev_version = new_version.version_info.version_number() - 1
if len(dates) == 1 and prev_version > 0:
old_version = get_versions(
self.object).as_of(version=prev_version)
elif prev_version <= 0:
old_version = None
else:
old_version = get_versions(self.object).as_of(date=old)
else:
# Using version numbers to display diff.
version1 = self.kwargs.get('version1')
version2 = self.kwargs.get('version2')
# Query parameter list used in history compare view.
versions = self.request.GET.getlist('version')
if not versions:
versions = [v for v in (version1, version2) if v]
if not versions:
raise Http404("Versions not specified")
versions = [int(v) for v in versions]
old = min(versions)
new = max(versions)
if len(versions) == 1:
old = max(new - 1, 1)
if old > 0:
old_version = get_versions(self.object).as_of(version=old)
else:
old_version = None
new_version = get_versions(self.object).as_of(version=new)
context.update({'old': old_version, 'new': new_version})
return context
def get_context_data(self, **kwargs):
context = super(CompareView, self).get_context_data(**kwargs)
if self.kwargs.get('date1'):
# Using datetimes to display diff.
date1 = self.kwargs.get('date1')
date2 = self.kwargs.get('date2')
# Query parameter list used in history compare view.
dates = self.request.GET.getlist('date')
if not dates:
dates = [v for v in (date1, date2) if v]
dates = [dateparser(v) for v in dates]
old = min(dates)
new = max(dates)
new_version = get_versions(self.object).as_of(date=new)
prev_version = new_version.version_info.version_number() - 1
if len(dates) == 1 and prev_version > 0:
old_version = get_versions(self.object).as_of(
version=prev_version)
elif prev_version <= 0:
old_version = None
else:
old_version = get_versions(self.object).as_of(date=old)
else:
# Using version numbers to display diff.
version1 = self.kwargs.get('version1')
version2 = self.kwargs.get('version2')
# Query parameter list used in history compare view.
versions = self.request.GET.getlist('version')
if not versions:
versions = [v for v in (version1, version2) if v]
if not versions:
raise Http404("Versions not specified")
versions = [int(v) for v in versions]
old = min(versions)
new = max(versions)
if len(versions) == 1:
old = max(new - 1, 1)
if old > 0:
old_version = get_versions(self.object).as_of(version=old)
else:
old_version = None
new_version = get_versions(self.object).as_of(version=new)
context.update({'old': old_version, 'new': new_version})
return context