app/soc/logic/model.py
author Sverre Rabbelier <srabbelier@gmail.com>
Sun, 12 Oct 2008 14:58:47 +0000
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child 305 972d28056d9d
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Moved soc/logic/helper/access to soc/views/helper/access Patch by: Sverre Rabbelier Reviewed by: to-be-reviewed
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#!/usr/bin/python2.5
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#
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# Copyright 2008 the Melange authors.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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#   http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Helpers functions for updating different kinds of models in datastore.
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"""
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__authors__ = [
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  '"Todd Larsen" <tlarsen@google.com>',
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  '"Sverre Rabbelier" <sverer@rabbelier.nl>',
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  '"Pawel Solyga" <pawel.solyga@gmail.com>',
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  ]
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from google.appengine.ext import db
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from soc.logic import key_name
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from soc.logic import out_of_band
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def getFullClassName(cls):
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  """Returns fully-qualified module.class name string.""" 
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  return '%s.%s' % (cls.__module__, cls.__name__) 
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def buildTypedQueryString(base_class, derived_class=None):
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  """Returns a GQL query string compatible with PolyModel.
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  Args:
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    base_class: Model class that inherits directly from
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      polymodel.PolyModel, such as soc.models.work.Work
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    derived_class: optional more-specific Model class that
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      derives from base_class, such as soc.models.document.Document;
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      default is None, in which case the inheritance_line
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      property is *not* tested by the returned query string
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  """
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  query_str_parts = ['SELECT * FROM ', base_class.__name__]
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  if derived_class:
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    query_str_parts.extend(
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      [" WHERE inheritance_line = '", getFullClassName(derived_class), "'"])
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  return ''.join(query_str_parts)
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def buildOrderedQueryString(base_class, derived_class=None, order_by=None):
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  """Returns a an ordered GQL query string compatible with PolyModel.
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  Args:
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    base_class, derived_class: see buildTypedQueryString()
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    order_by: optional field name by which to order the query results;
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      default is None, in which case no ORDER BY clause is placed in
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      the query string
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  """
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  query_str_parts = [
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    buildTypedQueryString(base_class, derived_class=derived_class)]
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  if order_by:
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    query_str_parts.extend([' ORDER BY ', order_by])
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  return ''.join(query_str_parts)
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def getEntitiesForLimitAndOffset(base_class, limit, offset=0,
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                                 derived_class=None, order_by=None):
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  """Returns entities for given offset and limit or None if not found.
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  Args:
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    limit: max amount of entities to return
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    offset: optional offset in entities list which defines first entity to
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      return; default is zero (first entity)
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  """
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  query_string = buildOrderedQueryString(
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      base_class, derived_class=derived_class, order_by=order_by)
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  query = db.GqlQuery(query_string)
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  return query.fetch(limit, offset)
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def getNearestEntities(base_class, fields_to_try, derived_class=None):
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  """Get entities just before and just after the described entity.
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    95
    
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  Args:
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    fields_to_try: ordered list of key/value pairs that "describe"
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      the desired entity (which may not necessarily exist), where key is
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      the name of the field, and value is an instance of that field
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      used in the comparison; if value is None, that field is skipped
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  Returns:
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    a two-tuple: ([nearest_entities], 'field_name')
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    nearest_entities: list of entities being those just before and just
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      after the (possibly non-existent) entity identified by the first
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      of the supplied (non-None) fields
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        OR
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      possibly None if query had no results for the supplied field
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      that was used.
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  """
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  # SELECT * FROM base_class WHERE inheritance_line = 'derived_class'
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  typed_query_str = buildTypedQueryString(
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    base_class, derived_class=derived_class)
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   115
  
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  if derived_class:
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    typed_query_str = typed_query_str + ' AND '
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  else:
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    typed_query_str = typed_query_str + ' WHERE '
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  for field, value in fields_to_try:
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    if value is None:
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      # skip this not-supplied field
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      continue
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    query = db.GqlQuery('%s%s > :1' % (typed_query_str, field), value)
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    return query.fetch(1), field
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   128
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  # all fields exhausted, and all had None values
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  return (None, None)
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   132
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def findNearestEntitiesOffset(width, base_class, fields_to_try,
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                              derived_class=None):
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  """Finds offset of beginning of a range of entities around the nearest.
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  Args:
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    width: the width of the "found" window around the nearest User found
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    base_class, fields_to_try, derived_class:  see getNearestEntities()
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  Returns:
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    an offset into the list of entities that is width/2 less than the
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    offset of the first entity returned by getNearestEntities(), or zero
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    if that offset would be less than zero
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      OR
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    None if there are no nearest entities or the offset of the beginning of
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    the range cannot be found for some reason 
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  """
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  # find entity "nearest" to supplied fields
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  nearest_entities, field = getNearestEntities(
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      base_class, fields_to_try, derived_class=derived_class)
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  if not nearest_entities:
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    # no "nearest" entity, so indicate that with None
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    return None
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  nearest_entity = nearest_entities[0]
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  # start search for beginning of nearest Users range at offset zero
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  offset = 0
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  entities = getEntitiesForLimitAndOffset(
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      base_class, width, offset=offset, derived_class=derived_class)
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  while True:
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    for entity in entities:
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      if getattr(nearest_entity, field) == getattr(entity, field):
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        # nearest User found in current search range, so return a range start
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        return max(0, (offset - (width/2)))
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      offset = offset + 1
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    # nearest User was not in the current search range, so fetch the next set
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    entities = getEntitiesForLimitAndOffset(
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        base_class, width, offset=offset, derived_class=derived_class)
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    if not entities:
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      # nearest User never found, so indicate that with None
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      break
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  return None
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299
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class BaseLogic():
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  """Base logic for entity classes.
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  The BaseLogic class functions specific to Entity classes by relying
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  on the the child-classes to implement _model, _name and _key_name
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  """
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  def _updateField(self, model, name, value):
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    """Hook called when a field is updated.
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    Base classes should override if any special actions need to be
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    taken when a field is updated. The field is not updated if the
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    method does not return a True value.
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    """
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    return True
141
e120c24b89e2 Added Melange front page edit view where you can change title, content, feed url. Created SiteSettings and Document models and some logic for them. Added isFeedURLValid function in soc/logic/feed.py. Created some functions for handling datastore updates of different kinds of Models (soc/logic/model.py). Fixed some typos and too long lines of code.
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299
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  def getFromKeyName(self, key_name):
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    """"Returns User entity for key_name or None if not found.
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-
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-    Args:
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-      key_name: key name of entity
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    """
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    return self._model.get_by_key_name(key_name)
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  def getFromFields(self, **kwargs):
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    """Returns the entity for a given link name, or None if not found.
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    Args:
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      link_name: a link name of the entity that uniquely identifies it
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    """
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    # lookup by Sponsor key name
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    key_name = self.getKeyNameForFields(**kwargs)
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    if key_name:
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      entity = self._model.get_by_key_name(key_name)
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    else:
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      entity = None
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    return entity
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  def getIfFields(self, **kwargs):
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    """Returns Sponsor entity for supplied link name if one exists.
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    Args:
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      link_name: a link name of the Sponsor that uniquely identifies it
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    Returns:
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      * None if link name is false.
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      * Sponsor entity for supplied link_name
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    Raises:
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      out_of_band.ErrorResponse if link name is not false, but no Sponsor entity
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      with the supplied link name exists in the Datastore
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    """
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    if not all(kwargs.values()):
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      # exit without error, to let view know that link_name was not supplied
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      return None
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    entity = self.getFromFields(**kwargs)
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    if entity:
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      # a Sponsor exist for this link_name, so return that Sponsor entity
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      return entity
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    fields = []
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    for key, value in kwargs.iteritems():
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      fields.extend('"%s" is "%s"' % (key, value))
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    # else: fields were supplied, but there is no Entity that has it
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    raise out_of_band.ErrorResponse(
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        'There is no %s with %s.' % (self._name, ''.join(fields)), status=404)
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  def getKeyNameForFields(self, **kwargs):
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    """Return a Datastore key_name for a Sponsor from the link name.
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    Args:
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      link_name: a link name of the entity that uniquely identifies it
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    """
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    if not all(kwargs.values()):
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      return None
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    return self._keyName(**kwargs)
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  def getForLimitAndOffset(self, limit, offset=0):
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    """Returns entities for given offset and limit or None if not found.
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    Args:
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      limit: max amount of entities to return
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      offset: optional offset in entities list which defines first entity to
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        return; default is zero (first entity)
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    """
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    query = self._model.all()
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    return query.fetch(limit, offset)
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  def updateModelProperties(self, model, **model_properties):
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    """Update existing model entity using supplied model properties.
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    Args:
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      model: a model entity
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      **model_properties: keyword arguments that correspond to model entity
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        properties and their values
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    Returns:
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      the original model entity with any supplied properties changed
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    """
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    def update():
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      return self._unsafeUpdateModelProperties(model, **model_properties)
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    return db.run_in_transaction(update)
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  def _unsafeUpdateModelProperties(self, model, **model_properties):
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    """(see updateModelProperties)
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    Like updateModelProperties(), but not run within a transaction.
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    """
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    properties = model.properties()
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    for prop in properties.values():
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      name = prop.name
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      if not name in self._skip_properties and name in model_properties:
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        value = model_properties[prop.name]
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        if self._updateField(model, name, value):
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          prop.__set__(model, value)
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    model.put()
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    return model
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  def updateOrCreateFromKeyName(self, properties, key_name):
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    """Update existing entity, or create new one with supplied properties.
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    Args:
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      link_name: a link_name of the entity that uniquely identifies it
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      **properties: keyword arguments that correspond to entity
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        properties and their values
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    Returns:
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      the entity corresponding to the key_name, with any supplied
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      properties changed, or a new entity now associated with the
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      supplied key_name and properties.
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    """
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    entity = self.getFromKeyName(key_name)
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    if not entity:
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      # entity did not exist, so create one in a transaction
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      entity = self._model.get_or_insert(key_name, **properties)
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    # there is no way to be sure if get_or_insert() returned a new entity or
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    # got an existing one due to a race, so update with sponsor_properties anyway,
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    # in a transaction
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    return self.updateModelProperties(entity, **properties)
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  def updateOrCreateFromFields(self, properties, **kwargs):
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    """Like updateOrCreateFromKeyName, but resolves **kwargs to a key_name first
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    """
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    # attempt to retrieve the existing entity
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    key_name  = self.getKeyNameForFields(**kwargs)
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    return self.updateOrCreateFromKeyName(properties, key_name)
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  def delete(self, entity):
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    """Delete existing entity from datastore.
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    Args:
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      entity: an existing entity in datastore
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    """
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    entity.delete()
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