old_contents: #!/usr/bin/python2.5
  #
  # Copyright 2009 the Melange authors.
  #
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  #
  #   http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  """Appengine Task to convert the Student datastore model to contain
  school_type.
  """
  
  __authors__ = [
      '"Madhusudan.C.S" <madhusudancs@gmail.com>',
      '"Lennard de Rijk" <ljvderijk@gmail.com>',
    ]
  
  
  from google.appengine.api.labs import taskqueue
  from google.appengine.ext import db
  
  from django.http import HttpResponse
  
  from soc.tasks.helper import error_handler
  
  
  # batch size to use when going through Student entities.
  DEF_BATCH_SIZE = 25
  
  
  def startSchoolTypeUpdate(request, task_url):
    """Spawns a task for initiating the Student model conversion to include
    school type.
  
    Args:
      request: Django Request object
      task_url: The URL used to run this update task
  
    Returns:
      True iff the new task is successfully added to the Task Queue API
    """
  
    new_task = taskqueue.Task(url=task_url)
    new_task.add()
  
    return True
  
  
  def runSchoolTypeUpdate(request, *args, **kwargs):
    """Appengine Task that adds school_type as University for existing
    Student entities in batches.
  
    Addition of required school_type property to Student model 
    requires addition of corresponding value to all the existing 
    Student entities in the datastore. Since this property is introduced
    during GSoC 2009 all students should be University students.
    This task sets the school_type value to "University" to
    all the existing entities.
  
    Args:
      request: Django Request object
    """
  
    from soc.logic.models.student import logic as student_logic
    from soc.models.student import Student
  
    fields = {}
  
    post_dict = request.POST
  
    start_key = post_dict.get('start_key')
  
    if start_key:
      # retrieve the last student entity that was converted
      start = student_logic.getFromKeyName(start_key)
  
      if not start:
        # invalid starting student key specified, log and return OK
        return error_handler.logErrorAndReturnOK(
            'Invalid Student Key specified: %s' %(start_key))
  
      fields['__key__ >'] = start.key()
  
    # get the first batch_size number of StudentProjects
    entities = student_logic.getForFields(fields, limit=DEF_BATCH_SIZE)
  
    for entity in entities:
      entity.school_type = 'University'
  
    db.put(entities)
  
    if len(entities) == DEF_BATCH_SIZE:
      # spawn new task starting from the last
      new_start = entities[DEF_BATCH_SIZE-1].key().id_or_name()
  
      # pass along these params as POST to the new task
      task_params = {'start_key': new_start}
  
      new_task = taskqueue.Task(params=task_params,
                                url=request.META['PATH_INFO'])
      new_task.add()
  
    # task completed, return OK
    return HttpResponse('OK')
  
new_contents: #!/usr/bin/python2.5
  #
  # Copyright 2009 the Melange authors.
  #
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  #
  #   http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  """Appengine Task to convert the Student datastore model to contain
  school_type.
  """
  
  __authors__ = [
      '"Madhusudan.C.S" <madhusudancs@gmail.com>',
      '"Lennard de Rijk" <ljvderijk@gmail.com>',
    ]
  
  
  from google.appengine.api.labs import taskqueue
  from google.appengine.ext import db
  
  from django.http import HttpResponse
  
  from soc.tasks.helper import error_handler
  
  
  # batch size to use when going through Student entities.
  DEF_BATCH_SIZE = 25
  
  
  def startSchoolTypeUpdate(request, task_url):
    """Spawns a task for initiating the Student model conversion to include
    school type.
  
    Args:
      request: Django Request object
      task_url: The URL used to run this update task
  
    Returns:
      True iff the new task is successfully added to the Task Queue API
    """
  
    new_task = taskqueue.Task(url=task_url)
    new_task.add()
  
    return True
  
  
  def runSchoolTypeUpdate(request, *args, **kwargs):
    """Appengine Task that adds school_type as University for existing
    Student entities in batches.
  
    Addition of required school_type property to Student model 
    requires addition of corresponding value to all the existing 
    Student entities in the datastore. Since this property is introduced
    during GSoC 2009 all students should be University students.
    This task sets the school_type value to "University" to
    all the existing entities.
  
    Args:
      request: Django Request object
    """
  
    from soc.logic.models.student import logic as student_logic
  
    fields = {}
  
    post_dict = request.POST
  
    start_key = post_dict.get('start_key')
  
    if start_key:
      # retrieve the last student entity that was converted
      start = student_logic.getFromKeyName(start_key)
  
      if not start:
        # invalid starting student key specified, log and return OK
        return error_handler.logErrorAndReturnOK(
            'Invalid Student Key specified: %s' %(start_key))
  
      fields['__key__ >'] = start.key()
  
    # get the first batch_size number of StudentProjects
    entities = student_logic.getForFields(fields, limit=DEF_BATCH_SIZE)
  
    for entity in entities:
      entity.school_type = 'University'
  
    db.put(entities)
  
    if len(entities) == DEF_BATCH_SIZE:
      # spawn new task starting from the last
      new_start = entities[DEF_BATCH_SIZE-1].key().id_or_name()
  
      # pass along these params as POST to the new task
      task_params = {'start_key': new_start}
  
      new_task = taskqueue.Task(params=task_params,
                                url=request.META['PATH_INFO'])
      new_task.add()
  
    # task completed, return OK
    return HttpResponse('OK')
  
subject: Remove unused imports from soc.tasks.updates modules.