Initial Fork from https://bitbucket.org/raphaelmutschler/calibreserver/

lib/sqlalchemy/orm/exc.py

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+# orm/exc.py
+# Copyright (C) 2005-2013 the SQLAlchemy authors and contributors <see AUTHORS file>
+#
+# This module is part of SQLAlchemy and is released under
+# the MIT License: http://www.opensource.org/licenses/mit-license.php
+
+"""SQLAlchemy ORM exceptions."""
+from .. import exc as sa_exc, util
+orm_util = util.importlater('sqlalchemy.orm', 'util')
+attributes = util.importlater('sqlalchemy.orm', 'attributes')
+
+NO_STATE = (AttributeError, KeyError)
+"""Exception types that may be raised by instrumentation implementations."""
+
+
+class StaleDataError(sa_exc.SQLAlchemyError):
+    """An operation encountered database state that is unaccounted for.
+
+    Conditions which cause this to happen include:
+
+    * A flush may have attempted to update or delete rows
+      and an unexpected number of rows were matched during
+      the UPDATE or DELETE statement.   Note that when
+      version_id_col is used, rows in UPDATE or DELETE statements
+      are also matched against the current known version
+      identifier.
+
+    * A mapped object with version_id_col was refreshed,
+      and the version number coming back from the database does
+      not match that of the object itself.
+
+    * A object is detached from its parent object, however
+      the object was previously attached to a different parent
+      identity which was garbage collected, and a decision
+      cannot be made if the new parent was really the most
+      recent "parent".
+
+      .. versionadded:: 0.7.4
+
+    """
+
+ConcurrentModificationError = StaleDataError
+
+
+class FlushError(sa_exc.SQLAlchemyError):
+    """A invalid condition was detected during flush()."""
+
+
+class UnmappedError(sa_exc.InvalidRequestError):
+    """Base for exceptions that involve expected mappings not present."""
+
+
+class ObjectDereferencedError(sa_exc.SQLAlchemyError):
+    """An operation cannot complete due to an object being garbage
+    collected.
+
+    """
+
+
+class DetachedInstanceError(sa_exc.SQLAlchemyError):
+    """An attempt to access unloaded attributes on a
+    mapped instance that is detached."""
+
+
+class UnmappedInstanceError(UnmappedError):
+    """An mapping operation was requested for an unknown instance."""
+
+    def __init__(self, obj, msg=None):
+        if not msg:
+            try:
+                mapper = orm_util.class_mapper(type(obj))
+                name = _safe_cls_name(type(obj))
+                msg = ("Class %r is mapped, but this instance lacks "
+                       "instrumentation.  This occurs when the instance"
+                       "is created before sqlalchemy.orm.mapper(%s) "
+                       "was called." % (name, name))
+            except UnmappedClassError:
+                msg = _default_unmapped(type(obj))
+                if isinstance(obj, type):
+                    msg += (
+                        '; was a class (%s) supplied where an instance was '
+                        'required?' % _safe_cls_name(obj))
+        UnmappedError.__init__(self, msg)
+
+    def __reduce__(self):
+        return self.__class__, (None, self.args[0])
+
+
+class UnmappedClassError(UnmappedError):
+    """An mapping operation was requested for an unknown class."""
+
+    def __init__(self, cls, msg=None):
+        if not msg:
+            msg = _default_unmapped(cls)
+        UnmappedError.__init__(self, msg)
+
+    def __reduce__(self):
+        return self.__class__, (None, self.args[0])
+
+
+class ObjectDeletedError(sa_exc.InvalidRequestError):
+    """A refresh operation failed to retrieve the database
+    row corresponding to an object's known primary key identity.
+
+    A refresh operation proceeds when an expired attribute is
+    accessed on an object, or when :meth:`.Query.get` is
+    used to retrieve an object which is, upon retrieval, detected
+    as expired.   A SELECT is emitted for the target row
+    based on primary key; if no row is returned, this
+    exception is raised.
+
+    The true meaning of this exception is simply that
+    no row exists for the primary key identifier associated
+    with a persistent object.   The row may have been
+    deleted, or in some cases the primary key updated
+    to a new value, outside of the ORM's management of the target
+    object.
+
+    """
+    def __init__(self, state, msg=None):
+        if not msg:
+            msg = "Instance '%s' has been deleted, or its "\
+             "row is otherwise not present." % orm_util.state_str(state)
+
+        sa_exc.InvalidRequestError.__init__(self, msg)
+
+    def __reduce__(self):
+        return self.__class__, (None, self.args[0])
+
+
+class UnmappedColumnError(sa_exc.InvalidRequestError):
+    """Mapping operation was requested on an unknown column."""
+
+
+class NoResultFound(sa_exc.InvalidRequestError):
+    """A database result was required but none was found."""
+
+
+class MultipleResultsFound(sa_exc.InvalidRequestError):
+    """A single database result was required but more than one were found."""
+
+
+def _safe_cls_name(cls):
+    try:
+        cls_name = '.'.join((cls.__module__, cls.__name__))
+    except AttributeError:
+        cls_name = getattr(cls, '__name__', None)
+        if cls_name is None:
+            cls_name = repr(cls)
+    return cls_name
+
+
+def _default_unmapped(cls):
+    try:
+        mappers = attributes.manager_of_class(cls).mappers
+    except NO_STATE:
+        mappers = {}
+    except TypeError:
+        mappers = {}
+    name = _safe_cls_name(cls)
+
+    if not mappers:
+        return "Class '%s' is not mapped" % name