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
   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(e)
  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
  60     def syntetic_lesson(self):
  61         try:
  62             return self.lesson_set.filter(type='synthetic')[0]
  63         except IndexError:
  64             return None
  65
  66
  67 class Lesson(models.Model):
  68     section = models.ForeignKey(Section, null=True, blank=True)
  69     level = models.ForeignKey(Level)
  70     title = models.CharField(max_length=255)
  71     slug = models.SlugField(unique=True)
  72     type = models.CharField(max_length=15, db_index=True)
  73     order = models.IntegerField(db_index=True)
  74     dc = JSONField(default='{}')
  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)
 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.order = 0
 131         lesson.populate_dc()
 132         lesson.type = lesson.dc["type"]
 133         lesson.save()
 134         lesson.build_html()
 135         lesson.build_package()
 136         lesson.build_package(student=True)
 137         return lesson
 138
 139     def populate_dc(self):
 140         from librarian.parser import WLDocument
 141         wldoc = WLDocument.from_file(self.xml_file.path)
 142         self.dc = wldoc.book_info.to_dict()
 143         self.save()
 144
 145     def build_html(self):
 146         from librarian.parser import WLDocument
 147         wldoc = WLDocument.from_file(self.xml_file.path)
 148         html = wldoc.as_html()
 149         self.html_file.save("%s.html" % self.slug,
 150             File(open(html.get_filename())))
 151
 152     def build_package(self, student=False):
 153         from StringIO import StringIO
 154         import zipfile
 155         from django.core.files.base import ContentFile
 156         buff = StringIO()
 157         zipf = zipfile.ZipFile(buff, 'w', zipfile.ZIP_STORED)
 158         zipf.write(self.xml_file.path, "pliki-zrodlowe/%s.xml" % self.slug)
 159         pdf = self.student_pdf if student else self.pdf
 160         if pdf:
 161             zipf.write(self.xml_file.path,
 162                 "%s%s.pdf" % (self.slug, "_student" if student else ""))
 163         zipf.close()
 164         fieldname = "student_package" if student else "package"
 165         getattr(self, fieldname).save(
 166             "%s%s.zip" % (self.slug, "_student" if student else ""),
 167             ContentFile(buff.getvalue()))
 168
 169
 170 class Attachment(models.Model):
 171     slug = models.CharField(max_length=255)
 172     ext = models.CharField(max_length=15)
 173     lesson = models.ForeignKey(Lesson)
 174     file = models.FileField(upload_to="catalogue/attachment")
 175
 176     class Meta:
 177         ordering = ['slug', 'ext']
 178         unique_together = ['lesson', 'slug', 'ext']
 179
 180     def __unicode__(self):
 181         return "%s.%s" % (self.slug, self.ext)
 182
 183
 184 class Part(models.Model):
 185     lesson = models.ForeignKey(Lesson)
 186     pdf = models.FileField(upload_to="catalogue/part/pdf",
 187         null=True, blank=True)
 188     student_pdf = models.FileField(upload_to="catalogue/part/student_pdf",
 189         null=True, blank=True)