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(max_length=255, unique=True)
  11     order = models.IntegerField()
  12     xml_file = models.FileField(upload_to="catalogue/section/xml",
  13         null=True, blank=True, max_length=255)
  14     image = models.ImageField(upload_to="catalogue/section/image",
  15         null=True, blank=True)
  16
  17     class Meta:
  18         ordering = ['order']
  19
  20     class IncompleteError(BaseException):
  21         pass
  22
  23     def __unicode__(self):
  24         return self.title
  25
  26     def get_absolute_url(self):
  27         return "%s#%s" % (reverse("catalogue_lessons"), self.slug)
  28
  29     @classmethod
  30     def publish(cls, infile):
  31         from librarian.parser import WLDocument
  32         from django.core.files.base import ContentFile
  33         xml = infile.get_string()
  34         wldoc = WLDocument.from_string(xml)
  35
  36         try:
  37             lessons = [Lesson.objects.get(slug=part.slug)
  38                         for part in wldoc.book_info.parts]
  39         except Lesson.DoesNotExist, e:
  40             raise cls.IncompleteError(part.slug)
  41
  42         slug = wldoc.book_info.url.slug
  43         try:
  44             section = cls.objects.get(slug=slug)
  45         except cls.DoesNotExist:
  46             section = cls(slug=slug, order=0)
  47
  48         # Save XML file
  49         section.xml_file.save('%s.xml' % slug, ContentFile(xml), save=False)
  50         section.title = wldoc.book_info.title
  51         section.save()
  52
  53         section.lesson_set.all().update(section=None)
  54         for i, lesson in enumerate(lessons):
  55             lesson.section = section
  56             lesson.order = i
  57             lesson.save()
  58
  59         return section
  60
  61     def syntetic_lesson(self, level):
  62         try:
  63             return self.lesson_set.filter(type='synthetic', level=level)[0]
  64         except IndexError:
  65             return None
  66
  67
  68 class Lesson(models.Model):
  69     section = models.ForeignKey(Section, null=True, blank=True)
  70     level = models.ForeignKey(Level)
  71     title = models.CharField(max_length=255)
  72     slug = models.SlugField(max_length=255, unique=True)
  73     type = models.CharField(max_length=15, db_index=True)
  74     order = models.IntegerField(db_index=True)
  75     dc = JSONField(default='{}')
  76     curriculum_courses = models.ManyToManyField(CurriculumCourse, blank=True)
  77
  78     xml_file = models.FileField(upload_to="catalogue/lesson/xml",
  79         null=True, blank=True, max_length=255)
  80     html_file = models.FileField(upload_to="catalogue/lesson/html",
  81         null=True, blank=True, max_length=255)
  82     package = models.FileField(upload_to="catalogue/lesson/pack",
  83         null=True, blank=True, max_length=255)
  84     student_package = models.FileField(upload_to="catalogue/lesson/student_pack",
  85         null=True, blank=True, max_length=255)
  86     pdf = models.FileField(upload_to="catalogue/lesson/pdf",
  87         null=True, blank=True, max_length=255)
  88     student_pdf = models.FileField(upload_to="catalogue/lesson/student_pdf",
  89         null=True, blank=True, max_length=255)
  90
  91     class Meta:
  92         ordering = ['section', 'level', 'order']
  93
  94     def __unicode__(self):
  95         return self.title
  96
  97     @models.permalink
  98     def get_absolute_url(self):
  99         return ('catalogue_lesson', [self.slug])
 100
 101     @classmethod
 102     def publish(cls, infile):
 103         from librarian.parser import WLDocument
 104         from django.core.files.base import ContentFile
 105         xml = infile.get_string()
 106         wldoc = WLDocument.from_string(xml)
 107
 108         # Check if not section metadata block.
 109         if wldoc.book_info.parts:
 110             return Section.publish(infile)
 111
 112         slug = wldoc.book_info.url.slug
 113         try:
 114             lesson = cls.objects.get(slug=slug)
 115             lesson.attachment_set.all().delete()
 116         except cls.DoesNotExist:
 117             lesson = cls(slug=slug, order=0)
 118
 119         # Save XML file
 120         lesson.xml_file.save('%s.xml' % slug, ContentFile(xml), save=False)
 121         lesson.title = wldoc.book_info.title
 122
 123         lesson.level = Level.objects.get(slug=wldoc.book_info.audience)
 124         lesson.populate_dc()
 125         lesson.build_html(infile=infile)
 126         lesson.build_pdf(infile=infile)
 127         lesson.build_pdf(student=True, infile=infile)
 128         lesson.build_package()
 129         lesson.build_package(student=True)
 130         return lesson
 131
 132     def populate_dc(self):
 133         from librarian.parser import WLDocument
 134         wldoc = WLDocument.from_file(self.xml_file.path)
 135         self.dc = wldoc.book_info.to_dict()
 136         self.type = self.dc["type"]
 137         self.save()
 138
 139         courses = set()
 140         for identifier in wldoc.book_info.curriculum:
 141             try:
 142                 curr = Curriculum.objects.get(identifier=identifier)
 143             except Curriculum.DoesNotExist:
 144                 pass
 145             else:
 146                 courses.add(curr.course)
 147         self.curriculum_courses = courses
 148
 149     def wldocument(self, infile=None):
 150         from librarian import IOFile
 151         from librarian.parser import WLDocument
 152         from .publish import OrmDocProvider
 153
 154         if infile is None:
 155             infile = IOFile.from_filename(self.xml_file.path)
 156             for att in self.attachment_set.all():
 157                 infile.attachments["%s.%s" % (att.slug, att.ext)] = \
 158                     IOFile.from_filename(att.file.path)
 159         return WLDocument(infile, provider=OrmDocProvider())
 160
 161     def build_html(self, infile=None):
 162         from .publish import HtmlFormat
 163         wldoc = self.wldocument(infile)
 164         html = HtmlFormat(wldoc).build()
 165         self.html_file.save("%s.html" % self.slug,
 166             File(open(html.get_filename())))
 167
 168     def build_pdf(self, student=False, infile=None):
 169         from .publish import PdfFormat
 170         wldoc = self.wldocument(infile)
 171         if student:
 172             pdf = PdfFormat(wldoc).build()
 173             self.student_pdf.save("%s.pdf" % self.slug,
 174                 File(open(pdf.get_filename())))
 175         else:
 176             pdf = PdfFormat(wldoc, teacher=True).build()
 177             self.pdf.save("%s.pdf" % self.slug,
 178                 File(open(pdf.get_filename())))
 179
 180     def add_to_zip(self, zipf, student=False, prefix=''):
 181         zipf.write(self.xml_file.path,
 182             "%spliki-zrodlowe/%s.xml" % (prefix, self.slug))
 183         pdf = self.student_pdf if student else self.pdf
 184         if pdf:
 185             zipf.write(pdf.path,
 186                 "%s%s%s.pdf" % (prefix, self.slug, "_student" if student else ""))
 187         for attachment in self.attachment_set.all():
 188             zipf.write(attachment.file.path,
 189                 u"%smaterialy/%s.%s" % (prefix, attachment.slug, attachment.ext))
 190
 191
 192
 193     def build_package(self, student=False):
 194         from StringIO import StringIO
 195         import zipfile
 196         from django.core.files.base import ContentFile
 197         buff = StringIO()
 198         zipf = zipfile.ZipFile(buff, 'w', zipfile.ZIP_STORED)
 199         self.add_to_zip(zipf, student)
 200         zipf.close()
 201         fieldname = "student_package" if student else "package"
 202         getattr(self, fieldname).save(
 203             "%s%s.zip" % (self.slug, "_student" if student else ""),
 204             ContentFile(buff.getvalue()))
 205
 206     def get_syntetic(self):
 207         if self.section is None: return None
 208         return self.section.syntetic_lesson(self.level)
 209
 210     def get_other_level(self):
 211         if self.section is None: return None
 212         other_levels = self.section.lesson_set.exclude(level=self.level)
 213         if other_levels.exists():
 214             return other_levels[0].level
 215
 216     def get_previous(self):
 217         if self.section is None: return None
 218         try:
 219             return self.section.lesson_set.filter(
 220                 type=self.type, level=self.level,
 221                 order__lt=self.order).order_by('-order')[0]
 222         except IndexError:
 223             return None
 224
 225     def get_next(self):
 226         if self.section is None: return None
 227         try:
 228             return self.section.lesson_set.filter(
 229                 type=self.type, level=self.level,
 230                 order__gt=self.order).order_by('order')[0]
 231         except IndexError:
 232             return None
 233
 234
 235 class Attachment(models.Model):
 236     slug = models.CharField(max_length=255)
 237     ext = models.CharField(max_length=15)
 238     lesson = models.ForeignKey(Lesson)
 239     file = models.FileField(upload_to="catalogue/attachment")
 240
 241     class Meta:
 242         ordering = ['slug', 'ext']
 243         unique_together = ['lesson', 'slug', 'ext']
 244
 245     def __unicode__(self):
 246         return "%s.%s" % (self.slug, self.ext)
 247
 248
 249 class Part(models.Model):
 250     lesson = models.ForeignKey(Lesson)
 251     pdf = models.FileField(upload_to="catalogue/part/pdf",
 252         null=True, blank=True)
 253     student_pdf = models.FileField(upload_to="catalogue/part/student_pdf",
 254         null=True, blank=True)
 255
 256
 257 class LessonStub(models.Model):
 258     section = models.ForeignKey(Section, null=True, blank=True)
 259     level = models.ForeignKey(Level)
 260     title = models.CharField(max_length=255)
 261     type = models.CharField(max_length=15, db_index=True)
 262     order = models.IntegerField(db_index=True)
 263
 264     class Meta:
 265         ordering = ['section', 'level', 'order']
 266
 267     def __unicode__(self):
 268         return self.title