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models.py
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180 lines (132 loc) · 5.38 KB
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from django.core.exceptions import ObjectDoesNotExist
from django.db import models
from django.urls import reverse
from ordered_model.models import OrderedModel
class _NoneCache:
pass
class Content(OrderedModel):
"""Mixing for defining content that can produce a breacrumb interface"""
title = models.CharField(max_length=50)
description = models.TextField()
slug = models.SlugField(unique=True)
_next_content_cache = _NoneCache
_previous_content_cache = _NoneCache
class Meta:
abstract = True
ordering = ('order',)
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
def parent(self):
"""Must return the parent of current content, which must be also implement Content or None"""
raise NotImplementedError()
def breadcrumb(self):
"""Must return an iterable with where which item is a tuple of (title, url) to content """
return gen_breadcrum(self)
def get_absolute_url(self):
"""Must return the absolute url for this content"""
raise NotImplementedError()
def __str__(self):
return self.title
def next_content(self):
if self._next_content_cache is not _NoneCache:
return self._next_content_cache
current = self
while current is not None:
try:
self._next_content_cache = current._next_content_query_set().get()
break
except ObjectDoesNotExist:
current = current.parent()
else:
self._next_content_cache = None
return self._next_content_cache
def _next_content_query_set(self):
"""Must provide a query set for next content"""
raise NotImplementedError()
def previous_content(self):
if self._previous_content_cache is not _NoneCache:
return self._previous_content_cache
previous = self
while previous is not None:
try:
self._previous_content_cache = previous._previous_content_query_set().get()
break
except ObjectDoesNotExist:
previous = previous.parent()
else:
self._previous_content_cache = None
return self._previous_content_cache
def _previous_content_query_set(self):
"""Must provide a query set for previous content"""
raise NotImplementedError()
def module_slug(self):
if self.parent() is None:
return self.slug
return self.parent().module_slug()
class ContentWithTitleMixin(Content):
"""
Missing implementing breadcrumb method for models which has a title
"""
class Meta:
abstract = True
def breadcrumb(self):
return gen_breadcrum(self)
def gen_breadcrum(content):
"""Function that generates breadcrumb for contents that respect Content protocol"""
parent = content.parent()
if parent is not None:
yield from parent.breadcrumb()
yield content.title, content.get_absolute_url()
class Module(Content):
objective = models.TextField()
target = models.TextField()
def parent(self):
return None
def get_absolute_url(self):
"""Must return the absolute url for this content"""
return reverse('modules:detail', kwargs={'slug': self.slug})
def _next_content_query_set(self):
return Module.objects.filter(order=self.order + 1)
def _previous_content_query_set(self):
return Module.objects.filter(order=self.order - 1)
class Section(Content):
module = models.ForeignKey('Module', on_delete=models.CASCADE)
order_with_respect_to = 'module'
class Meta:
ordering = ['module', 'order']
def get_absolute_url(self):
return reverse('sections:detail', kwargs={'slug': self.slug})
def parent(self):
return self.module
def _next_content_query_set(self):
return Section.objects.filter(module=self.module, order=self.order + 1)
def _previous_content_query_set(self):
return Section.objects.filter(module=self.module, order=self.order - 1)
class Chapter(Content):
section = models.ForeignKey('Section', on_delete=models.CASCADE)
order_with_respect_to = 'section'
class Meta:
ordering = ['section', 'order']
def get_absolute_url(self):
return reverse('chapters:detail', kwargs={'slug': self.slug})
def parent(self):
return self.section
def _next_content_query_set(self):
return Chapter.objects.filter(section=self.section, order=self.order + 1)
def _previous_content_query_set(self):
return Chapter.objects.filter(section=self.section, order=self.order - 1)
class Topic(Content):
chapter = models.ForeignKey('Chapter', on_delete=models.CASCADE)
vimeo_id = models.CharField(max_length=11, db_index=False)
discourse_topic_id = models.CharField(max_length=11, db_index=False)
order_with_respect_to = 'chapter'
class Meta:
ordering = ['chapter', 'order']
def get_absolute_url(self):
return reverse('modules:topic_detail', kwargs={'module_slug': self.module_slug(), 'topic_slug': self.slug})
def parent(self):
return self.chapter
def _next_content_query_set(self):
return Topic.objects.filter(chapter=self.chapter, order=self.order + 1)
def _previous_content_query_set(self):
return Topic.objects.filter(chapter=self.chapter, order=self.order - 1)