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models.py
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models.py
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"""
Some models for pulling data from Trac.
Initially generated by inspectdb then modified heavily by hand, often by
consulting http://trac.edgewall.org/wiki/TracDev/DatabaseSchema.
These are far from perfect: many (most?) Trac tables have composite primary
keys, which Django can't represent. This means a lot of built-in Django stuff
(the admin, for example) won't work at all with these models. I haven't
investigated just how deeply down thess failures go, but I suspect all sorts
of things just won't work.
However, they're Good Enough(tm) to let me pull some basic (read-only) data out,
and that's all I really need.
Some potential TODOs:
* Add some convienance manager functions to deal with ticket_custom. Right
now you can query with a join::
Ticket.objects.filter(custom_fields__name='ui_ux',
custom_fields__value='1')
Perhaps we might be able to get something like::
Ticket.objects.with_custom(ui_ux=True)
Or even a custom .filter() that intercepts and figures it out?
* Trac stores SVN repository revisions as '0000003744' grar. This
makes querying awkward. There's probably some tricky manager manger
that we could do here.
* The whole Revision model will fall apart if we ever had a second
repository to Trac.
And a few notes on tables that're left out and why:
* All the session and permission tables: they're just not needd.
* Enum: I don't know what this is or what it's for.
* NodeChange: Ditto.
"""
from __future__ import unicode_literals
import datetime
from django.db import models
from django.utils.tzinfo import FixedOffset
_epoc = datetime.datetime(1970, 1, 1, tzinfo=FixedOffset(0))
class time_property(object):
"""
Convert Trac timestamps into UTC datetimes.
See http://trac.edgewall.org/browser//branches/0.12-stable/trac/util/datefmt.py
for Trac's version of all this. Mine's something of a simplification.
Like the rest of this module this is far from perfect -- no setters, for
example! That's good enough for now.
"""
def __init__(self, fieldname):
self.fieldname = fieldname
def __get__(self, instance, owner):
if instance is None:
return self
timestamp = getattr(instance, self.fieldname)
return _epoc + datetime.timedelta(microseconds=timestamp)
class Ticket(models.Model):
id = models.IntegerField(primary_key=True)
type = models.TextField()
_time = models.BigIntegerField(db_column='time')
time = time_property('_time')
_changetime = models.BigIntegerField(db_column='changetime')
changetime = time_property('_changetime')
component = models.ForeignKey('Component', related_name='tickets', db_column='component')
severity = models.TextField()
owner = models.TextField()
reporter = models.TextField()
cc = models.TextField()
version = models.ForeignKey('Version', related_name='tickets', db_column='version')
milestone = models.ForeignKey('Milestone', related_name='tickets', db_column='milestone')
priority = models.TextField()
status = models.TextField()
resolution = models.TextField()
summary = models.TextField()
description = models.TextField()
keywords = models.TextField()
class Meta(object):
db_table = 'ticket'
managed = False
def __unicode__(self):
return "#%s: %s" % (self.id, self.summary)
def __init__(self, *args, **kwargs):
super(Ticket, self).__init__(*args, **kwargs)
# Munge custom fields onto this object. This sucks since it implies
# querying will work (it won't!) and that writing will work (ditto).
# Also notice that *nasty* mapping of Trac's "booleanish" things to
# real booleans. This can fail in a bunch of ways, but not in our
# particular install.
for name, value in self.custom_fields.values_list('name', 'value'):
if value in ('0', '1'):
value = bool(int(value))
setattr(self, name, value)
class TicketCustom(models.Model):
ticket = models.ForeignKey(Ticket, related_name='custom_fields', db_column='ticket', primary_key=True)
name = models.TextField()
value = models.TextField()
class Meta(object):
db_table = 'ticket_custom'
managed = False
def __unicode__(self):
return "%s: %s" % (self.name, self.value)
class TicketChange(models.Model):
ticket = models.ForeignKey(Ticket, related_name='changes', db_column='ticket', primary_key=True)
author = models.TextField()
field = models.TextField()
oldvalue = models.TextField()
newvalue = models.TextField()
_time = models.BigIntegerField(db_column='time')
time = time_property('_time')
class Meta(object):
db_table = 'ticket_change'
managed = False
ordering = ['_time']
def __unicode__(self):
return "#%s: changed %s" % (self.ticket.id, self.field)
class Component(models.Model):
name = models.TextField(primary_key=True)
owner = models.TextField()
description = models.TextField()
class Meta(object):
db_table = 'component'
managed = False
def __unicode__(self):
return self.name
class Version(models.Model):
name = models.TextField(primary_key=True)
description = models.TextField()
_time = models.BigIntegerField(db_column='time')
time = time_property('_time')
class Meta(object):
db_table = 'version'
managed = False
def __unicode__(self):
return self.name
class Milestone(models.Model):
name = models.TextField(primary_key=True)
description = models.TextField()
_due = models.BigIntegerField(db_column='_due')
due = time_property('due')
_completed = models.BigIntegerField(db_column='_completed')
completed = time_property('completed')
class Meta(object):
db_table = 'milestone'
managed = False
def __unicode__(self):
return self.name
class SingleRepoRevisionManager(models.Manager):
"""
Forces Revision to only query against a single repo, thus making
Revision.rev behave something like a primary key.
"""
def __init__(self, repo_id):
self.repo_id = repo_id
super(SingleRepoRevisionManager, self).__init__()
def get_queryset(self):
qs = super(SingleRepoRevisionManager, self).get_queryset()
return qs.filter(repos=self.repo_id)
SINGLE_REPO_ID = 1
class Revision(models.Model):
repos = models.IntegerField()
rev = models.TextField(primary_key=True)
_time = models.BigIntegerField(db_column='time')
time = time_property('time')
author = models.TextField()
message = models.TextField()
objects = SingleRepoRevisionManager(repo_id=SINGLE_REPO_ID)
class Meta(object):
db_table = 'revision'
managed = False
def __unicode__(self):
return '[%s] %s' % (self.rev, self.message.split('\n', 1)[0])
# The Wiki table uses a composite primary key (name, version). Since
# Django doesn't support this, this model sits on top of a simple view.
class Wiki(models.Model):
django_id = models.TextField(primary_key=True)
name = models.TextField()
version = models.IntegerField()
_time = models.BigIntegerField(db_column='time')
time = time_property('time')
author = models.TextField()
ipnr = models.TextField()
text = models.TextField()
comment = models.TextField()
readonly = models.IntegerField()
class Meta:
db_table = 'wiki_django_view'
managed = False
def __unicode__(self):
return '%s (v%s)' % (self.name, self.version)
# Same story as for Wiki: attachment's PK is (type, id, filename), so again
# there's a simple view this is on top of.
class Attachment(models.Model):
django_id = models.TextField(primary_key=True)
type = models.TextField()
id = models.TextField()
filename = models.TextField()
size = models.IntegerField()
_time = models.BigIntegerField(db_column='time')
time = time_property('time')
description = models.TextField()
author = models.TextField()
ipnr = models.TextField()
class Meta:
db_table = 'attachment_django_view'
managed = False
def __unicode__(self):
attached_to = ('#%s' % self.id) if self.type == 'ticket' else self.id
return '%s (on %s)' % (self.filename, attached_to)