models.py

from django.db import models
from django.utils import timezone
from django.core.validators import URLValidator, RegexValidator
from django.contrib.postgres.fields import HStoreField

#################################################
#
# file path should depend on instance type
#
#################################################

def filepath(instance, filename):
    strPublicationSerie = instance.Publication.Serie
    strPublicationNumber = str(instance.Publication.Number)
    baseString = strPublicationSerie + "/" + strPublicationNumber + "/"
    if instance.__class__.__name__ == Author:
        strFilePath = 'authors'
    elif instance.__class__.__name__ == Publication:
        strFilePath = baseString + "/" + filename
    elif instance.__class__.__name__ == Chapter:
        strChapterOrder = str(instance.Order)
        strFilePath = baseString + strChapterOrder + "/" + filename
    return strFilePath

############################################
#
# default settings which are used in several places
#
############################################

series_choice = (
    ('sources', 'Sources'),
    ('studies', 'Studies'),
    ('essays', 'Essays'),
    ('proceedings', 'Proceedings'),
    ('textbooks', 'Textbooks'),
    )

citation_choice = (
    ('book', 'Book'),
    ('journalArticle', 'Journal Article'),
    ('bookSection', 'Book Section'),
    ('thesis', 'Thesis'),
    )

language_choice = (
    ('de', 'German'),
    ('en', 'English'),
    ('it', 'Italian'),
    )

tagname_choice = (
    ('hi', 'Highlight'),
    ('foreign', 'Foreign'),
    ('ref', 'Reference'),
    ('note','Note'),
    ('label','Label'),
    ('language','Language'),
    ('graphic','Graphic'),
)

default_char = {
    'max_length':200,
    'default':None,
    'blank':True,
    'null':True,
    }

validkeys = [
    'place',
    'type',
    'target',
    'indexname',
    'sortkey',
    'xml:lang',
    'pages',
    'n',
    'url',
    'rendition',
    'rend',
    'height',
    'notation'
]

##########################################
#
# basic information on publications, citations and authors
#
###########################################

class Publication(models.Model):
    series = models.CharField(
        max_length=20,
        choices=series_choice,
        default='sources')
    language = models.CharField(
        max_length=2,
        choices=language_choice,
        default='de')
    published = models.BooleanField(default=False)
    featured = models.BooleanField(default=False)
    publication_id = models.IntegerField(default=None)
    publisher = models.CharField(**default_char)
    title = models.CharField(**default_char)
    subtitle = models.CharField(**default_char)
    description = models.TextField(blank=True)
    pages = models.PositiveIntegerField()
    price = models.FloatField()
    created_date = models.DateField(
        default =None,
        null=True)
    published_date = models.DateField(
        blank=True,
        null=True,
        default=None)

    def publish(self):
        self.published_date = timezone.now()
        self.save()

    def __str__(self):
        return self.title

    class Meta:
        ordering = ('title',)


class Citation(models.Model):
    pubtype = models.CharField(
        max_length=20,
        choices=citation_choice,
        default='book'
    )
    titlea = models.CharField(**default_char)
    titlem = models.CharField(**default_char)
    date = models.IntegerField(
        blank=True,
        null=False,
        validators=[RegexValidator(r'^\d{4}$')])
    pupPlace = models.CharField(**default_char)
    publisher = models.CharField(**default_char)
    volume = models.CharField(**default_char)
    issue = models.CharField(**default_char)
    page = models.CharField(**default_char)
    idstring = models.CharField(max_length=200,blank=False)
    note = models.TextField(blank=True)

    def __str__(self):
        return self.idstring + ': ' + self.title

    class Meta:
        ordering = ('title',)


class Author(models.Model):
    firstname = models.CharField(max_length=200, blank=False)
    lastname = models.CharField(max_length=200, blank=False)
    middlenames = models.CharField(**default_char)
    email = models.EmailField(
        default=None,
        blank=True,
        null=True,
        unique=True)
    homepage = models.URLField(**default_char)
    description = models.CharField(**default_char)
    publications = models.ManyToManyField(
        Publication,
        blank=True,
        related_name='authors')
    citations = models.ManyToManyField(
        Citation,
        blank=True,
        related_name='authors')
    editions = models.ManyToManyField(
        Citation,
        blank=True,
        related_name='editors')
    born = models.DateField(
        blank=True, null=True)
    foto = models.ImageField(upload_to=filepath, blank=True)

    def edit_birthday(self):
        self.born = timezone.now()
        self.save()

    def __str__(self):
       return (str(self.firstname) + ' '\
               + str(self.middlenames) + ' '\
               + str(self.lastname))

    class Meta:
        ordering = ('lastname',)

##########################################
#
# Common Text Parts and their abstract class
#
###########################################

class CommonTextPart(models.Model):
    publication = models.ForeignKey(Publication)
    title = models.CharField(max_length=200, blank=True)
    idstring = models.CharField(max_length=100,blank=True)
    order = models.PositiveIntegerField(
        null=False,
        validators=[RegexValidator(r'^\d{1,10}$')])
    number = models.CharField(max_length=20, blank=True)
    language = models.CharField(
        max_length=2,
        choices=language_choice,
        default='de')
    authors = models.ManyToManyField(
        Author,
        default=None,
        blank=True)
    doi = models.CharField(max_length=200, blank=True)
    citation = models.CharField(max_length=200, blank=True)
    pdf = models.FileField(upload_to=filepath, blank=True)

    def __str__(self):
       return (self.publication.__str__() + ' ' + str(self.order) + ':' + self.title)

    class Meta:
        abstract = True
        ordering = ('order',)


class Part(CommonTextPart):
    pass


class Chapter(CommonTextPart):
    part = models.ForeignKey(Part, blank=True, null=True)


class Section(CommonTextPart):
    part = models.ForeignKey(Part, blank=True, null=True)
    chapter = models.ForeignKey(Chapter, blank=False)


class Subsection(CommonTextPart):
    part = models.ForeignKey(Part, blank=True, null=True)
    chapter = models.ForeignKey(Chapter, blank=False)
    section = models.ForeignKey(Section, blank=False)


class Subsubsection(CommonTextPart):
    part = models.ForeignKey(Part, blank=True, null=True)
    chapter = models.ForeignKey(Chapter, blank=False)
    section = models.ForeignKey(Section, blank=False)
    subsection = models.ForeignKey(Subsection, blank=False)

class MixedContent(models.Model):
    parent = models.ForeignKey(MixedContent, blank=True)
    position = model.PositiveIntegerField(blank=False)
    tagname = models.CharField(**default_char,
                               choices=tagname_choice,
                               default='de')
    attributes = HStoreField(
        validators=[
            KeysValidator(
                validkeys,
                strict=True,
                messages = {
                    'missing_keys': _('Some keys were missing: %(keys)s'),
                    'extra_keys': _('Some unknown keys were provided: %(keys)s'),
                    }
                )
            ]
        )

    class Meta:
        abstract = True

class Paragraph(models.Model):
    publication = models.ForeignKey(Publication)
    part = models.ForeignKey(Part, blank=True, null=True)
    chapter = models.ForeignKey(Chapter, blank=True, null=True)
    section = models.ForeignKey(Section, blank=True, null=True)
    subsection = models.ForeignKey(Subsection, blank=True, null=True)
    subsubsection = models.ForeignKey(Subsubsection, blank=True, null=True)
    idstring = models.CharField(max_length=100,blank=True)
    text = models.ForeignKey(MixedContent,blank=False)

    def __str__(self):
       return (self.publication.__str__() + ' ' + str(self.idstring))

    class Meta:
        ordering = ('idstring',)

class Text(models.Model):
    parent = models.ForeignKey(MixedContent)
    position = models.PositiveIntegerField(blank=False)
    text = models.TextField(blank=True)
    pass

class Table(models.Model):
    pass

class Figure(models.Model):
    pass