我正在制作漫画书数据库,主要封面和变体封面。我有一个显示所有主要封面的页面,但我也想按照出版日期的顺序组合变体封面。这是我的模型的一部分:
class Image(models.Model):
CATEGORY_CHOICES = (
('Cover', 'Cover'),
('Scan', 'Scan'),
('Other', 'Other'),
)
title = models.CharField(max_length=128)
number = models.CharField(max_length=20, help_text="Do not include the '#'.")
image = models.ImageField(upload_to="images/")
category = models.CharField(max_length=10, choices=CATEGORY_CHOICES)
### The variant cover is determined by the category_choice 'Cover'. ###
contributor = models.ManyToManyField(Contributor, blank=True, null=True)
date_added = models.DateField(auto_now_add=True, auto_now=True)
def __unicode__(self):
return self.title
class Meta:
ordering = ['title']
class Issue(models.Model):
CATEGORY_CHOICES = (
('Major', 'Major'),
('Minor', 'Minor'),
('Cameo', 'Cameo'),
('Other', 'Other'),
)
title = models.ForeignKey(Title)
number = models.CharField(max_length=20, help_text="Do not include the '#'.")
pub_date = models.DateField(blank=True, null=True)
cover_image = models.ImageField(upload_to="covers/", blank=True, null=True)
### This would be where the main image goes. ^^^ ###
images = models.ManyToManyField(Image, related_name="images_inc", blank=True, null=True)
### This is where the variant covers go.^^^ ###
has_emma = models.BooleanField(help_text="Check if Emma appears on the cover.")
主要封面的my views.py如下所示:
def covers(request):
sort_by = request.GET.get('sort', 'pub_date')
if sort_by not in ['-date_added', 'date_added', '-pub_date', 'pub_date']:
sort_by = '-date_added'
issues = Issue.objects.filter(has_emma=True).order_by(sort_by).select_related(depth=1)
return render_to_response('comics/covers.html', {'issues': issues}, context_instance=RequestContext(request))
但我想展示变体封面,而不仅仅是cover_image
。有没有办法做到这一点?也许使用某些image
然后过滤类别(Image
模型的封面)?
我当然可以这样做:
def variants(request):
Issue.objects.filter(has_emma=True).order_by(sort_by).select_related(depth=1)
images = Image.objects.filter(category='Cover').order_by('id')
return render_to_response('comics/variants.html', {'images': images}, context_instance=RequestContext(request))
但这并没有像def covers
那样给我足够的灵活性,我希望它们合并并按pub_date排序,如def covers
。
修改
models.py:
class Image(models.Model):
CATEGORY_CHOICES = (
('Cover', 'Cover'),
('Scan', 'Scan'),
('Other', 'Other'),
)
title = models.CharField(max_length=128)
image = models.ImageField(upload_to="images/")
category = models.CharField(max_length=10, choices=CATEGORY_CHOICES)
date_added = models.DateField(auto_now_add=True, auto_now=True)
def __unicode__(self):
return self.title
class Meta:
ordering = ['title']
class Issue(models.Model):
title = models.ForeignKey(Title)
number = models.CharField(max_length=20)
######
has_emma = models.BooleanField(help_text="Check if cover appearance.")
cover_image = models.ImageField(upload_to="covers/", blank=True, null=True)
images = models.ManyToManyField(Image, related_name="images_inc", blank=True, null=True)
######
def get_images(self):
''' Returns a list of all cover images combined,
"main" cover image first.
'''
images = [self.cover_image]
for image in self.images.filter(category='Cover'):
images.append(image.image)
return images
views.py:
def covers(request):
sort_by = request.GET.get('sort', '-pub_date')
if sort_by not in ['-date_added', 'date_added', '-pub_date', 'pub_date']:
sort_by = '-date_added'
issues = Issue.objects.filter(has_emma=True).order_by(sort_by)
return render_to_response('template.html', {'issues': issues,}, context_instance=RequestContext(request))
template.html:
{% for issue in issues %}{% for image in issue.get_images %}{{ image.image }}{% endfor %}{% endfor %}
- 不显示任何内容,但{% for issue in issues %} {% for image in issue.get_images %} {{ issue.cover_image }} {% endfor %} {% endfor %}
将重复显示cover_image
模型的Issue
,如果存在变体封面,则归类于Image
模型。
我该怎么做才能解决这个问题,以便正确显示所有内容?再次记录,我希望它显示{{ cover_image }}
(来自Issue
模型)和{{ image.image }}
模型所定义的Image
。
答案 0 :(得分:0)
如果我正确理解您的问题,解决问题的一种方法是向Issue
类添加一个方法,如下所示:
class Issue(models.Model):
# fields...
def get_images(self):
''' Returns a list of all cover images combined,
"main" cover image first.
'''
images = [self.cover_image]
for image in self.images.filter(category='Cover'):
images.append(image.image)
return images
然后,在您的模板中,您可以执行{% for image in issue.get_images %}...
。
(如果它不完全符合您的需求 - 那么,我认为,如果您提供一些模板代码作为您要实现的目标的示例,那会更好。)