'''
Created on Jul 17, 2014
Reworked in December, 2015
@author: tc, nd
'''
import uuid, logging, json, datetime
from django.conf import settings
from django.db import models, transaction
from django.core.exceptions import ValidationError
from django.utils import timezone, dateparse
logger = logging.getLogger(__name__)
auth_user_model = getattr(settings, 'AUTH_USER_MODEL', 'auth.User')
class Workspace(models.Model):
workspace_guid = models.CharField(max_length=1024, default=uuid.uuid4, unique=True, blank=False, null=False) # typically UUID
title = models.CharField(max_length=1024, null=True)
creator = models.ForeignKey(auth_user_model, blank=True, null=True, related_name="workspace_creator")
creation_date = models.DateTimeField(auto_now_add=True)
@property
def renkan_count(self):
return Renkan.objects.filter(workspace__workspace_guid=self.workspace_guid).count()
class Meta:
app_label = 'renkanmanager'
permissions = (
('view_workspace', 'Can view workspace'),
)
class RenkanManager(models.Manager):
@transaction.atomic
def create_renkan(self, creator, title='', content='', source_revision=None, workspace = None):
new_renkan = Renkan()
new_renkan.creator = creator
new_renkan_workspace_guid = ""
new_renkan_title = title
new_renkan_content = content
if workspace is not None:
new_renkan.workspace = workspace
new_renkan_workspace_guid = workspace.workspace_guid
if source_revision is not None:
new_renkan.source_revision = source_revision
if not title:
new_renkan_title = source_revision.title
new_renkan_content = source_revision.content
new_renkan.save()
initial_revision = Revision(parent_renkan=new_renkan)
initial_revision.modification_date = timezone.now()
initial_revision.creator = creator
initial_revision.last_updated_by = creator
initial_revision.save() # saving once to set the creation date as we need it to fill the json content
if initial_revision.modification_date != initial_revision.creation_date:
initial_revision.modification_date = initial_revision.creation_date
initial_revision.title = new_renkan_title if new_renkan_title else "Untitled Renkan"
if new_renkan_content:
try:
new_renkan_content_dict = json.loads(new_renkan_content)
except ValueError:
raise ValidationError("Provided content to create Renkan is not a JSON-serializable")
new_renkan_content_dict["created"] = str(initial_revision.creation_date)
new_renkan_content_dict["updated"] = str(initial_revision.modification_date)
else:
new_renkan_content_dict = {
"id": str(new_renkan.renkan_guid),
"title": initial_revision.title,
"description": "",
"created": str(initial_revision.creation_date),
"updated": str(initial_revision.modification_date),
"edges": [],
"nodes": [],
"users": [],
"space_id": new_renkan_workspace_guid,
"views": []
}
initial_revision.content = json.dumps(new_renkan_content_dict)
initial_revision.save()
return new_renkan
class Renkan(models.Model):
renkan_guid = models.CharField(max_length=256, default=uuid.uuid4, unique=True, blank=False, null=False) # typically UUID
workspace = models.ForeignKey('Workspace', null=True, blank=True, to_field='workspace_guid')
source_revision = models.ForeignKey('Revision', null=True, blank=True, related_name="renkan_source_revision", to_field='revision_guid', on_delete=models.SET_NULL)
creator = models.ForeignKey(auth_user_model, blank=True, null=True, related_name="renkan_creator")
creation_date = models.DateTimeField(auto_now_add=True)
state = models.IntegerField(default=1)
objects = RenkanManager()
@property
def revision_count(self):
return Revision.objects.filter(parent_renkan__renkan_guid=self.renkan_guid).count()
@property
def is_copy(self):
return bool(self.source_revision)
# Current revision object or None if there is none
@property
def current_revision(self):
return Revision.objects.filter(parent_renkan__renkan_guid=self.renkan_guid).order_by('-creation_date').first()
# Current revision title
@property
def title(self):
if self.current_revision:
return self.current_revision.title
else:
return ''
# Current revision content
@property
def content(self):
if self.current_revision:
return self.current_revision.content
else:
return ''
@transaction.atomic
def save_renkan(self, updator, timestamp="", title="", content="", create_new_revision=False):
"""
Saves over current revision or saves a new revision entirely.
Timestamp must be the current revision modification_date.
"""
if (not timestamp) or ((self.current_revision is not None) and dateparse.parse_datetime(timestamp) < self.current_revision.modification_date):
logger.error("SAVING RENKAN: provided timestamp is %r, which isn't current revision modification_date %r", timestamp, self.current_revision.modification_date)
raise ValidationError(message="Error saving Renkan: provided timestamp isn't current revision modification_date")
else:
dt_timestamp = dateparse.parse_datetime(timestamp)
self.save()
if create_new_revision:
revision_to_update = Revision(parent_renkan=self)
revision_to_update.creator = updator
else:
revision_to_update = Revision.objects.select_for_update().get(revision_guid=self.current_revision.revision_guid)
updated_content = content if content else current_revision.content
try:
updated_content_dict = json.loads(updated_content)
except ValueError:
raise ValidationError(message="Provided content for Renkan is not a JSON-serializable")
# If title is passed as arg to the method, update the title in the json
if title:
updated_title = title
updated_content_dict["title"] = title
# If it is not, we use the one in the json instead
else:
updated_title = updated_content_dict["title"]
revision_to_update.modification_date = timezone.now()
updated_content_dict["updated"] = str(revision_to_update.modification_date)
updated_content = json.dumps(updated_content_dict)
revision_to_update.title = updated_title
revision_to_update.content = updated_content
if dt_timestamp == revision_to_update.modification_date:
revision_to_update.modification_date += datetime.resolution
revision_to_update.last_updated_by = updator
revision_to_update.save()
@transaction.atomic
def delete(self):
"""
Deleting a renkan also deletes every related revision
"""
renkan_revisions = Revision.objects.filter(parent_renkan__renkan_guid = self.renkan_guid)
for child_revision in renkan_revisions:
child_revision.delete()
super(Renkan, self).delete()
class Meta:
app_label = 'renkanmanager'
permissions = (
('view_renkan', 'Can view renkan'),
)
class Revision(models.Model):
revision_guid = models.CharField(max_length=256, default=uuid.uuid4, unique=True) # typically UUID
parent_renkan = models.ForeignKey('Renkan', null=False, blank=False, to_field='renkan_guid')
title = models.CharField(max_length=1024, null=True, blank=True)
content = models.TextField(blank=True, null=True)
creator = models.ForeignKey(auth_user_model, blank=True, null=True, related_name="revision_creator")
last_updated_by = models.ForeignKey(auth_user_model, blank=True, null=True, related_name="revision_last_updated_by")
creation_date = models.DateTimeField(auto_now_add=True)
modification_date = models.DateTimeField()
@property
def is_current_revision(self):
# No need to check if parent_renkan.current_revision is not None, as it won't be if we're calling from a revision
return self.parent_renkan.current_revision.revision_guid == self.revision_guid
class Meta:
app_label = 'renkanmanager'
permissions = (
('view_revision', 'Can view revision'),
)