/usr/lib/python2.7/dist-packages/sqlobject/inheritance/__init__.py is in python-sqlobject 2.1.2-1.
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from sqlobject import classregistry
from sqlobject import events
from sqlobject import sqlbuilder
from sqlobject.col import StringCol, ForeignKey
from sqlobject.main import sqlmeta, SQLObject, SelectResults, \
makeProperties, unmakeProperties, getterName, setterName
import iteration
def tablesUsedSet(obj, db):
if hasattr(obj, "tablesUsedSet"):
return obj.tablesUsedSet(db)
elif isinstance(obj, (tuple, list, set, frozenset)):
s = set()
for component in obj:
s.update(tablesUsedSet(component, db))
return s
else:
return set()
class InheritableSelectResults(SelectResults):
IterationClass = iteration.InheritableIteration
def __init__(self, sourceClass, clause, clauseTables=None,
inheritedTables=None, **ops):
if clause is None or isinstance(clause, str) and clause == 'all':
clause = sqlbuilder.SQLTrueClause
dbName = (ops.get('connection',None) or sourceClass._connection).dbName
tablesSet = tablesUsedSet(clause, dbName)
tablesSet.add(str(sourceClass.sqlmeta.table))
orderBy = ops.get('orderBy')
if inheritedTables:
for tableName in inheritedTables:
tablesSet.add(str(tableName))
if orderBy and not isinstance(orderBy, basestring):
tablesSet.update(tablesUsedSet(orderBy, dbName))
#DSM: if this class has a parent, we need to link it
#DSM: and be sure the parent is in the table list.
#DSM: The following code is before clauseTables
#DSM: because if the user uses clauseTables
#DSM: (and normal string SELECT), he must know what he wants
#DSM: and will do himself the relationship between classes.
if not isinstance(clause, str):
tableRegistry = {}
allClasses = classregistry.registry(
sourceClass.sqlmeta.registry).allClasses()
for registryClass in allClasses:
if str(registryClass.sqlmeta.table) in tablesSet:
#DSM: By default, no parents are needed for the clauses
tableRegistry[registryClass] = registryClass
tableRegistryCopy = tableRegistry.copy()
for childClass in tableRegistryCopy:
if childClass not in tableRegistry:
continue
currentClass = childClass
while currentClass:
if currentClass in tableRegistryCopy:
if currentClass in tableRegistry:
#DSM: Remove this class as it is a parent one
#DSM: of a needed children
del tableRegistry[currentClass]
#DSM: Must keep the last parent needed
#DSM: (to limit the number of join needed)
tableRegistry[childClass] = currentClass
currentClass = currentClass.sqlmeta.parentClass
#DSM: Table registry contains only the last children
#DSM: or standalone classes
parentClause = []
for (currentClass, minParentClass) in tableRegistry.items():
while (currentClass != minParentClass) \
and currentClass.sqlmeta.parentClass:
parentClass = currentClass.sqlmeta.parentClass
parentClause.append(currentClass.q.id == parentClass.q.id)
currentClass = parentClass
tablesSet.add(str(currentClass.sqlmeta.table))
clause = reduce(sqlbuilder.AND, parentClause, clause)
super(InheritableSelectResults, self).__init__(sourceClass,
clause, clauseTables, **ops)
def accumulateMany(self, *attributes, **kw):
if kw.get("skipInherited"):
return super(InheritableSelectResults, self).accumulateMany(*attributes)
tables = []
for func_name, attribute in attributes:
if not isinstance(attribute, basestring):
tables.append(attribute.tableName)
clone = self.__class__(self.sourceClass, self.clause,
self.clauseTables, inheritedTables=tables, **self.ops)
return clone.accumulateMany(skipInherited=True, *attributes)
class InheritableSQLMeta(sqlmeta):
@classmethod
def addColumn(sqlmeta, columnDef, changeSchema=False, connection=None, childUpdate=False):
soClass = sqlmeta.soClass
#DSM: Try to add parent properties to the current class
#DSM: Only do this once if possible at object creation and once for
#DSM: each new dynamic column to refresh the current class
if sqlmeta.parentClass:
for col in sqlmeta.parentClass.sqlmeta.columnList:
cname = col.name
if cname == 'childName': continue
if cname.endswith("ID"): cname = cname[:-2]
setattr(soClass, getterName(cname), eval(
'lambda self: self._parent.%s' % cname))
if not col.immutable:
def make_setfunc(cname):
def setfunc(self, val):
if not self.sqlmeta._creating and not getattr(self.sqlmeta, "row_update_sig_suppress", False):
self.sqlmeta.send(events.RowUpdateSignal, self, {cname : val})
result = setattr(self._parent, cname, val)
return setfunc
setfunc = make_setfunc(cname)
setattr(soClass, setterName(cname), setfunc)
if childUpdate:
makeProperties(soClass)
return
if columnDef:
super(InheritableSQLMeta, sqlmeta).addColumn(columnDef, changeSchema, connection)
#DSM: Update each child class if needed and existing (only for new
#DSM: dynamic column as no child classes exists at object creation)
if columnDef and hasattr(soClass, "q"):
q = getattr(soClass.q, columnDef.name, None)
else:
q = None
for c in sqlmeta.childClasses.values():
c.sqlmeta.addColumn(columnDef, connection=connection, childUpdate=True)
if q: setattr(c.q, columnDef.name, q)
@classmethod
def delColumn(sqlmeta, column, changeSchema=False, connection=None, childUpdate=False):
if childUpdate:
soClass = sqlmeta.soClass
unmakeProperties(soClass)
makeProperties(soClass)
if isinstance(column, str):
name = column
else:
name = column.name
delattr(soClass, name)
delattr(soClass.q, name)
return
super(InheritableSQLMeta, sqlmeta).delColumn(column, changeSchema, connection)
#DSM: Update each child class if needed
#DSM: and delete properties for this column
for c in sqlmeta.childClasses.values():
c.sqlmeta.delColumn(column, changeSchema=changeSchema,
connection=connection, childUpdate=True)
@classmethod
def addJoin(sqlmeta, joinDef, childUpdate=False):
soClass = sqlmeta.soClass
#DSM: Try to add parent properties to the current class
#DSM: Only do this once if possible at object creation and once for
#DSM: each new dynamic join to refresh the current class
if sqlmeta.parentClass:
for join in sqlmeta.parentClass.sqlmeta.joins:
jname = join.joinMethodName
jarn = join.addRemoveName
setattr(soClass, getterName(jname),
eval('lambda self: self._parent.%s' % jname))
if hasattr(join, 'remove'):
setattr(soClass, 'remove' + jarn,
eval('lambda self,o: self._parent.remove%s(o)' % jarn))
if hasattr(join, 'add'):
setattr(soClass, 'add' + jarn,
eval('lambda self,o: self._parent.add%s(o)' % jarn))
if childUpdate:
makeProperties(soClass)
return
if joinDef:
super(InheritableSQLMeta, sqlmeta).addJoin(joinDef)
#DSM: Update each child class if needed and existing (only for new
#DSM: dynamic join as no child classes exists at object creation)
for c in sqlmeta.childClasses.values():
c.sqlmeta.addJoin(joinDef, childUpdate=True)
@classmethod
def delJoin(sqlmeta, joinDef, childUpdate=False):
if childUpdate:
soClass = sqlmeta.soClass
unmakeProperties(soClass)
makeProperties(soClass)
return
super(InheritableSQLMeta, sqlmeta).delJoin(joinDef)
#DSM: Update each child class if needed
#DSM: and delete properties for this join
for c in sqlmeta.childClasses.values():
c.sqlmeta.delJoin(joinDef, childUpdate=True)
@classmethod
def getAllColumns(sqlmeta):
columns = sqlmeta.columns.copy()
sm = sqlmeta
while sm.parentClass:
columns.update(sm.parentClass.sqlmeta.columns)
sm = sm.parentClass.sqlmeta
return columns
@classmethod
def getColumns(sqlmeta):
columns = sqlmeta.getAllColumns()
if 'childName' in columns:
del columns['childName']
return columns
class InheritableSQLObject(SQLObject):
sqlmeta = InheritableSQLMeta
_inheritable = True
SelectResultsClass = InheritableSelectResults
def set(self, **kw):
if self._parent:
SQLObject.set(self, _suppress_set_sig=True, **kw)
else:
SQLObject.set(self, **kw)
def __classinit__(cls, new_attrs):
SQLObject.__classinit__(cls, new_attrs)
# if we are a child class, add sqlbuilder fields from parents
currentClass = cls.sqlmeta.parentClass
while currentClass:
for column in currentClass.sqlmeta.columnDefinitions.values():
if column.name == 'childName':
continue
if isinstance(column, ForeignKey):
continue
setattr(cls.q, column.name,
getattr(currentClass.q, column.name))
currentClass = currentClass.sqlmeta.parentClass
@classmethod
def _SO_setupSqlmeta(cls, new_attrs, is_base):
# Note: cannot use super(InheritableSQLObject, cls)._SO_setupSqlmeta -
# InheritableSQLObject is not defined when it's __classinit__
# is run. Cannot use SQLObject._SO_setupSqlmeta, either:
# the method would be bound to wrong class.
if cls.__name__ == "InheritableSQLObject":
call_super = super(cls, cls)
else:
# InheritableSQLObject must be in globals yet
call_super = super(InheritableSQLObject, cls)
call_super._SO_setupSqlmeta(new_attrs, is_base)
sqlmeta = cls.sqlmeta
sqlmeta.childClasses = {}
# locate parent class and register this class in it's children
sqlmeta.parentClass = None
for superclass in cls.__bases__:
if getattr(superclass, '_inheritable', False) \
and (superclass.__name__ != 'InheritableSQLObject'):
if sqlmeta.parentClass:
# already have a parent class;
# cannot inherit from more than one
raise NotImplementedError(
"Multiple inheritance is not implemented")
sqlmeta.parentClass = superclass
superclass.sqlmeta.childClasses[cls.__name__] = cls
if sqlmeta.parentClass:
# remove inherited column definitions
cls.sqlmeta.columns = {}
cls.sqlmeta.columnList = []
cls.sqlmeta.columnDefinitions = {}
# default inheritance child name
if not sqlmeta.childName:
sqlmeta.childName = cls.__name__
@classmethod
def get(cls, id, connection=None, selectResults=None, childResults=None, childUpdate=False):
val = super(InheritableSQLObject, cls).get(id, connection, selectResults)
#DSM: If we are updating a child, we should never return a child...
if childUpdate: return val
#DSM: If this class has a child, return the child
if 'childName' in cls.sqlmeta.columns:
childName = val.childName
if childName is not None:
childClass = cls.sqlmeta.childClasses[childName]
# If the class has no columns (which sometimes makes sense
# and may be true for non-inheritable (leaf) classes only),
# shunt the query to avoid almost meaningless SQL
# like "SELECT NULL FROM child WHERE id=1".
# This is based on assumption that child object exists
# if parent object exists. (If it doesn't your database
# is broken and that is a job for database maintenance.)
if not (childResults or childClass.sqlmeta.columns):
childResults = (None,)
return childClass.get(id, connection=connection,
selectResults=childResults)
#DSM: Now, we know we are alone or the last child in a family...
#DSM: It's time to find our parents
inst = val
while inst.sqlmeta.parentClass and not inst._parent:
inst._parent = inst.sqlmeta.parentClass.get(id,
connection=connection, childUpdate=True)
inst = inst._parent
#DSM: We can now return ourself
return val
@classmethod
def _notifyFinishClassCreation(cls):
sqlmeta = cls.sqlmeta
# verify names of added columns
if sqlmeta.parentClass:
# FIXME: this does not check for grandparent column overrides
parentCols = sqlmeta.parentClass.sqlmeta.columns.keys()
for column in sqlmeta.columnList:
if column.name == 'childName':
raise AttributeError(
"The column name 'childName' is reserved")
if column.name in parentCols:
raise AttributeError("The column '%s' is"
" already defined in an inheritable parent"
% column.name)
# if this class is inheritable, add column for children distinction
if cls._inheritable and (cls.__name__ != 'InheritableSQLObject'):
sqlmeta.addColumn(StringCol(name='childName',
# limit string length to get VARCHAR and not CLOB
length=255, default=None))
if not sqlmeta.columnList:
# There are no columns - call addColumn to propagate columns
# from parent classes to children
sqlmeta.addColumn(None)
if not sqlmeta.joins:
# There are no joins - call addJoin to propagate joins
# from parent classes to children
sqlmeta.addJoin(None)
def _create(self, id, **kw):
#DSM: If we were called by a children class,
#DSM: we must retreive the properties dictionary.
#DSM: Note: we can't use the ** call paremeter directly
#DSM: as we must be able to delete items from the dictionary
#DSM: (and our children must know that the items were removed!)
if 'kw' in kw:
kw = kw['kw']
#DSM: If we are the children of an inheritable class,
#DSM: we must first create our parent
if self.sqlmeta.parentClass:
parentClass = self.sqlmeta.parentClass
new_kw = {}
parent_kw = {}
for (name, value) in kw.items():
if (name != 'childName') and hasattr(parentClass, name):
parent_kw[name] = value
else:
new_kw[name] = value
kw = new_kw
# Need to check that we have enough data to sucesfully
# create the current subclass otherwise we will leave
# the database in an inconsistent state.
for col in self.sqlmeta.columnList:
if (col._default == sqlbuilder.NoDefault) and \
(col.name not in kw) and (col.foreignName not in kw):
raise TypeError, "%s() did not get expected keyword argument %s" % (self.__class__.__name__, col.name)
parent_kw['childName'] = self.sqlmeta.childName
self._parent = parentClass(kw=parent_kw,
connection=self._connection)
id = self._parent.id
# TC: Create this record and catch all exceptions in order to destroy
# TC: the parent if the child can not be created.
try:
super(InheritableSQLObject, self)._create(id, **kw)
except:
# If we are outside a transaction and this is a child, destroy the parent
connection = self._connection
if (not isinstance(connection, dbconnection.Transaction) and
connection.autoCommit) and self.sqlmeta.parentClass:
self._parent.destroySelf()
#TC: Do we need to do this??
self._parent = None
# TC: Reraise the original exception
raise
@classmethod
def _findAlternateID(cls, name, dbName, value, connection=None):
result = list(cls.selectBy(connection, **{name: value}))
if not result:
return result, None
obj = result[0]
return [obj.id], obj
@classmethod
def select(cls, clause=None, *args, **kwargs):
parentClass = cls.sqlmeta.parentClass
childUpdate = kwargs.pop('childUpdate', None)
# childUpdate may have one of three values:
# True:
# select was issued by parent class to create child objects.
# Execute select without modifications.
# None (default):
# select is run by application. If this class is inheritance
# child, delegate query to the parent class to utilize
# InheritableIteration optimizations. Selected records
# are restricted to this (child) class by adding childName
# filter to the where clause.
# False:
# select is delegated from inheritance child which is parent
# of another class. Delegate the query to parent if possible,
# but don't add childName restriction: selected records
# will be filtered by join to the table filtered by childName.
if (not childUpdate) and parentClass:
if childUpdate is None:
# this is the first parent in deep hierarchy
addClause = parentClass.q.childName == cls.sqlmeta.childName
# if the clause was one of TRUE varians, replace it
if (clause is None) or (clause is sqlbuilder.SQLTrueClause) \
or (isinstance(clause, basestring) and (clause == 'all')):
clause = addClause
else:
# patch WHERE condition:
# change ID field of this class to ID of parent class
# XXX the clause is patched in place; it would be better
# to build a new one if we have to replace field
clsID = cls.q.id
parentID = parentClass.q.id
def _get_patched(clause):
if isinstance(clause, sqlbuilder.SQLOp):
_patch_id_clause(clause)
return None
elif not isinstance(clause, sqlbuilder.Field):
return None
elif (clause.tableName == clsID.tableName) \
and (clause.fieldName == clsID.fieldName):
return parentID
else:
return None
def _patch_id_clause(clause):
if not isinstance(clause, sqlbuilder.SQLOp):
return
expr = _get_patched(clause.expr1)
if expr:
clause.expr1 = expr
expr = _get_patched(clause.expr2)
if expr:
clause.expr2 = expr
_patch_id_clause(clause)
# add childName filter
clause = sqlbuilder.AND(clause, addClause)
return parentClass.select(clause, childUpdate=False,
*args, **kwargs)
else:
return super(InheritableSQLObject, cls).select(
clause, *args, **kwargs)
@classmethod
def selectBy(cls, connection=None, **kw):
clause = []
foreignColumns = {}
currentClass = cls
while currentClass:
foreignColumns.update(dict([(column.foreignName, name)
for (name, column) in currentClass.sqlmeta.columns.items()
if column.foreignKey
]))
currentClass = currentClass.sqlmeta.parentClass
for name, value in kw.items():
if name in foreignColumns:
name = foreignColumns[name] # translate "key" to "keyID"
if isinstance(value, SQLObject):
value = value.id
currentClass = cls
while currentClass:
try:
clause.append(getattr(currentClass.q, name) == value)
break
except AttributeError, err:
pass
currentClass = currentClass.sqlmeta.parentClass
else:
raise AttributeError("'%s' instance has no attribute '%s'"
% (cls.__name__, name))
if clause:
clause = reduce(sqlbuilder.AND, clause)
else:
clause = None # select all
conn = connection or cls._connection
return cls.SelectResultsClass(cls, clause, connection=conn)
def destroySelf(self):
#DSM: If this object has parents, recursivly kill them
if hasattr(self, '_parent') and self._parent:
self._parent.destroySelf()
super(InheritableSQLObject, self).destroySelf()
def _reprItems(self):
items = super(InheritableSQLObject, self)._reprItems()
# add parent attributes (if any)
if self.sqlmeta.parentClass:
items.extend(self._parent._reprItems())
# filter out our special column
return [item for item in items if item[0] != 'childName']
__all__ = ['InheritableSQLObject']
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