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             lesson.attachment_set.all().delete()
 114         except cls.DoesNotExist:
 115             lesson = cls(slug=slug, order=0)
 116
 117         # Save XML file
 118         lesson.xml_file.save('%s.xml' % slug, ContentFile(xml), save=False)
 119         lesson.title = wldoc.book_info.title
 120
 121         lesson.level = Level.objects.get(slug=wldoc.book_info.audience)
 122         lesson.populate_dc()
 123         lesson.build_html(infile=infile)
 124         lesson.build_package()
 125         lesson.build_package(student=True)
 126         return lesson
 127
 128     def populate_dc(self):
 129         from librarian.parser import WLDocument
 130         wldoc = WLDocument.from_file(self.xml_file.path)
 131         self.dc = wldoc.book_info.to_dict()
 132         self.type = self.dc["type"]
 133         self.save()
 134
 135         courses = set()
 136         for identifier in wldoc.book_info.curriculum:
 137             try:
 138                 curr = Curriculum.objects.get(identifier=identifier)
 139             except Curriculum.DoesNotExist:
 140                 pass
 141             else:
 142                 courses.add(curr.course)
 143         self.curriculum_courses = courses
 144
 145     def build_html(self, infile=None):
 146         from librarian.parser import WLDocument
 147         from .publish import HtmlFormat
 148
 149         if infile is None:
 150             wldoc = WLDocument.from_file(self.xml_file.path)
 151         else:
 152             wldoc = WLDocument(infile)
 153         html = HtmlFormat(wldoc).build()
 154         self.html_file.save("%s.html" % self.slug,
 155             File(open(html.get_filename())))
 156
 157     def add_to_zip(self, zipf, student=False, prefix=''):
 158         zipf.write(self.xml_file.path,
 159             "%spliki-zrodlowe/%s.xml" % (prefix, self.slug))
 160         pdf = self.student_pdf if student else self.pdf
 161         if pdf:
 162             zipf.write(self.xml_file.path,
 163                 "%s%s%s.pdf" % (prefix, self.slug, "_student" if student else ""))
 164
 165
 166     def build_package(self, student=False):
 167         from StringIO import StringIO
 168         import zipfile
 169         from django.core.files.base import ContentFile
 170         buff = StringIO()
 171         zipf = zipfile.ZipFile(buff, 'w', zipfile.ZIP_STORED)
 172         self.add_to_zip(zipf, student)
 173         zipf.close()
 174         fieldname = "student_package" if student else "package"
 175         getattr(self, fieldname).save(
 176             "%s%s.zip" % (self.slug, "_student" if student else ""),
 177             ContentFile(buff.getvalue()))
 178
 179     def get_syntetic(self):
 180         return self.section.syntetic_lesson(self.level)
 181
 182     def get_previous(self):
 183         if self.section is None: return None
 184         try:
 185             return self.section.lesson_set.filter(
 186                 type=self.type, level=self.level,
 187                 order__lt=self.order).order_by('-order')[0]
 188         except IndexError:
 189             return None
 190
 191     def get_next(self):
 192         if self.section is None: return None
 193         try:
 194             return self.section.lesson_set.filter(
 195                 type=self.type, level=self.level,
 196                 order__gt=self.order).order_by('order')[0]
 197         except IndexError:
 198             return None
 199
 200
 201 class Attachment(models.Model):
 202     slug = models.CharField(max_length=255)
 203     ext = models.CharField(max_length=15)
 204     lesson = models.ForeignKey(Lesson)
 205     file = models.FileField(upload_to="catalogue/attachment")
 206
 207     class Meta:
 208         ordering = ['slug', 'ext']
 209         unique_together = ['lesson', 'slug', 'ext']
 210
 211     def __unicode__(self):
 212         return "%s.%s" % (self.slug, self.ext)
 213
 214
 215 class Part(models.Model):
 216     lesson = models.ForeignKey(Lesson)
 217     pdf = models.FileField(upload_to="catalogue/part/pdf",
 218         null=True, blank=True)
 219     student_pdf = models.FileField(upload_to="catalogue/part/student_pdf",
 220         null=True, blank=True)