catalogue/models.py

   1 from django.core.files import File
   2 from django.core.urlresolvers import reverse
   3 from django.db import models
   4 from jsonfield import JSONField
   5 from curriculum.models import Level, Curriculum, CurriculumCourse
   6
   7
   8 class Section(models.Model):
   9     title = models.CharField(max_length=255, unique=True)
  10     slug = models.SlugField(unique=True)
  11     order = models.IntegerField()
  12     xml_file = models.FileField(upload_to="catalogue/section/xml",
  13         null=True, blank=True)
  14
  15     class Meta:
  16         ordering = ['order']
  17
  18     class IncompleteError(BaseException):
  19         pass
  20
  21     def __unicode__(self):
  22         return self.title
  23
  24     def get_absolute_url(self):
  25         return "%s#%s" % (reverse("catalogue_lessons"), self.slug)
  26
  27     @classmethod
  28     def publish(cls, infile):
  29         from librarian.parser import WLDocument
  30         from django.core.files.base import ContentFile
  31         xml = infile.get_string()
  32         wldoc = WLDocument.from_string(xml)
  33
  34         try:
  35             lessons = [Lesson.objects.get(slug=part.slug)
  36                         for part in wldoc.book_info.parts]
  37         except Lesson.DoesNotExist, e:
  38             raise cls.IncompleteError(part.slug)
  39
  40         slug = wldoc.book_info.url.slug
  41         try:
  42             section = cls.objects.get(slug=slug)
  43         except cls.DoesNotExist:
  44             section = cls(slug=slug, order=0)
  45
  46         # Save XML file
  47         section.xml_file.save('%s.xml' % slug, ContentFile(xml), save=False)
  48         section.title = wldoc.book_info.title
  49         section.save()
  50
  51         section.lesson_set.all().update(section=None)
  52         for i, lesson in enumerate(lessons):
  53             lesson.section = section
  54             lesson.order = i
  55             lesson.save()
  56
  57         return section
  58
  59     def syntetic_lesson(self, level):
  60         try:
  61             return self.lesson_set.filter(type='synthetic', level=level)[0]
  62         except IndexError:
  63             return None
  64
  65
  66 class Lesson(models.Model):
  67     section = models.ForeignKey(Section, null=True, blank=True)
  68     level = models.ForeignKey(Level)
  69     title = models.CharField(max_length=255)
  70     slug = models.SlugField(unique=True)
  71     type = models.CharField(max_length=15, db_index=True)
  72     order = models.IntegerField(db_index=True)
  73     dc = JSONField(default='{}')
  74     curriculum_courses = models.ManyToManyField(CurriculumCourse)
  75
  76     xml_file = models.FileField(upload_to="catalogue/lesson/xml",
  77         null=True, blank=True) # FIXME: slug in paths
  78     html_file = models.FileField(upload_to="catalogue/lesson/html",
  79         null=True, blank=True)
  80     package = models.FileField(upload_to="catalogue/lesson/pack",
  81         null=True, blank=True)
  82     student_package = models.FileField(upload_to="catalogue/lesson/student_pack",
  83         null=True, blank=True)
  84     pdf = models.FileField(upload_to="catalogue/lesson/pdf",
  85         null=True, blank=True)
  86     student_pdf = models.FileField(upload_to="catalogue/lesson/student_pdf",
  87         null=True, blank=True)
  88
  89     class Meta:
  90         ordering = ['section', 'level', 'order']
  91
  92     def __unicode__(self):
  93         return self.title
  94
  95     @models.permalink
  96     def get_absolute_url(self):
  97         return ('catalogue_lesson', [self.slug])
  98
  99     @classmethod
 100     def publish(cls, infile):
 101         from librarian.parser import WLDocument
 102         from django.core.files.base import ContentFile
 103         xml = infile.get_string()
 104         wldoc = WLDocument.from_string(xml)
 105
 106         # Check if not section metadata block.
 107         if wldoc.book_info.parts:
 108             return Section.publish(infile)
 109
 110         slug = wldoc.book_info.url.slug
 111         try:
 112             lesson = cls.objects.get(slug=slug)
 113         except cls.DoesNotExist:
 114             lesson = cls(slug=slug, order=0)
 115
 116         lesson.attachment_set.all().delete()
 117         for att_name, att_file in infile.attachments.items():
 118             try:
 119                 slug, ext = att_name.rsplit('.', 1)
 120             except ValueError:
 121                 slug, ext = att_name, ''
 122             attachment = lesson.attachment_set.create(slug=slug, ext=ext)
 123             attachment.file.save(att_name, ContentFile(att_file.get_string()))
 124
 125         # Save XML file
 126         lesson.xml_file.save('%s.xml' % slug, ContentFile(xml), save=False)
 127         lesson.title = wldoc.book_info.title
 128
 129         lesson.level = Level.objects.get(slug=wldoc.book_info.audience)
 130         lesson.populate_dc()
 131         lesson.build_html()
 132         lesson.build_package()
 133         lesson.build_package(student=True)
 134         return lesson
 135
 136     def populate_dc(self):
 137         from librarian.parser import WLDocument
 138         wldoc = WLDocument.from_file(self.xml_file.path)
 139         self.dc = wldoc.book_info.to_dict()
 140         self.type = self.dc["type"]
 141         self.save()
 142
 143         courses = set()
 144         for identifier in wldoc.book_info.curriculum:
 145             try:
 146                 curr = Curriculum.objects.get(identifier=identifier)
 147             except Curriculum.DoesNotExist:
 148                 pass
 149             else:
 150                 courses.add(curr.course)
 151         self.curriculum_courses = courses
 152
 153     def build_html(self):
 154         from librarian.parser import WLDocument
 155         wldoc = WLDocument.from_file(self.xml_file.path)
 156         html = wldoc.as_html()
 157         self.html_file.save("%s.html" % self.slug,
 158             File(open(html.get_filename())))
 159
 160     def add_to_zip(self, zipf, student=False, prefix=''):
 161         zipf.write(self.xml_file.path,
 162             "%spliki-zrodlowe/%s.xml" % (prefix, self.slug))
 163         pdf = self.student_pdf if student else self.pdf
 164         if pdf:
 165             zipf.write(self.xml_file.path,
 166                 "%s%s%s.pdf" % (prefix, self.slug, "_student" if student else ""))
 167
 168
 169     def build_package(self, student=False):
 170         from StringIO import StringIO
 171         import zipfile
 172         from django.core.files.base import ContentFile
 173         buff = StringIO()
 174         zipf = zipfile.ZipFile(buff, 'w', zipfile.ZIP_STORED)
 175         self.add_to_zip(zipf, student)
 176         zipf.close()
 177         fieldname = "student_package" if student else "package"
 178         getattr(self, fieldname).save(
 179             "%s%s.zip" % (self.slug, "_student" if student else ""),
 180             ContentFile(buff.getvalue()))
 181
 182     def get_syntetic(self):
 183         return self.section.syntetic_lesson(self.level)
 184
 185     def get_previous(self):
 186         if self.section is None: return None
 187         try:
 188             return self.section.lesson_set.filter(
 189                 type=self.type, level=self.level,
 190                 order__lt=self.order).order_by('-order')[0]
 191         except IndexError:
 192             return None
 193
 194     def get_next(self):
 195         if self.section is None: return None
 196         try:
 197             return self.section.lesson_set.filter(
 198                 type=self.type, level=self.level,
 199                 order__gt=self.order).order_by('order')[0]
 200         except IndexError:
 201             return None
 202
 203
 204 class Attachment(models.Model):
 205     slug = models.CharField(max_length=255)
 206     ext = models.CharField(max_length=15)
 207     lesson = models.ForeignKey(Lesson)
 208     file = models.FileField(upload_to="catalogue/attachment")
 209
 210     class Meta:
 211         ordering = ['slug', 'ext']
 212         unique_together = ['lesson', 'slug', 'ext']
 213
 214     def __unicode__(self):
 215         return "%s.%s" % (self.slug, self.ext)
 216
 217
 218 class Part(models.Model):
 219     lesson = models.ForeignKey(Lesson)
 220     pdf = models.FileField(upload_to="catalogue/part/pdf",
 221         null=True, blank=True)
 222     student_pdf = models.FileField(upload_to="catalogue/part/student_pdf",
 223         null=True, blank=True)