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Replace String* sqla stuff with association_proxy.

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This commit is contained in:
Eevee 2011-03-14 22:24:29 -07:00
parent a0f5c53193
commit a417a0a9e1
1 changed files with 8 additions and 79 deletions
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87
pokedex/db/tables.py
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@ -1918,9 +1918,14 @@ def makeTextTable(object_table, name_plural, name_singular, columns, lazy):
for colname, pluralname, column in columns:
# Provide a property with all the names, and an English accessor
# for backwards compatibility
setattr(object_table, pluralname, StringProperty(
object_table, Strings, colname,
))
def text_string_creator(language_code, string):
row = Strings()
row._language_identifier = language_code
setattr(row, colname, string)
return row
setattr(object_table, pluralname,
association_proxy(name_plural, colname, creator=text_string_creator))
setattr(object_table, colname, DefaultLangProperty(pluralname))
if colname == 'name':
@ -1928,82 +1933,6 @@ def makeTextTable(object_table, name_plural, name_singular, columns, lazy):
return Strings
class StringProperty(object):
def __init__(self, cls, stringclass, colname):
self.cls = cls
self.colname = colname
self.stringclass = stringclass
def __get__(self, instance, cls):
if instance:
return StringMapping(instance, self)
else:
return self
def __getitem__(self, lang):
return StringExpression(self, lang)
def __str__(self):
return '<StringDict %s.%s>' % (self.cls, self.colname)
class StringMapping(collections.MutableMapping):
def __init__(self, instance, prop):
self.stringclass = prop.stringclass
self.instance = instance
self.strings = getattr(instance, prop.stringclass._attrname)
self.colname = prop.colname
def __len__(self):
return len(self.strings)
def __iter__(self):
return iter(self.strings)
def __contains__(self, lang):
return lang in self.strings
def __getitem__(self, lang):
return getattr(self.strings[lang], self.colname)
def __setitem__(self, lang, value):
try:
# Modifying an existing row
row = self.strings[lang]
except KeyError:
# We need do add a whole row for the language
row = self.stringclass()
row.object_id = self.instance.id
session = object_session(self.instance)
if isinstance(lang, basestring):
lang = session.query(Language).filter_by(
identifier=lang).one()
row.language = lang
self.strings[lang] = row
session.add(row)
return setattr(row, self.colname, value)
def __delitem__(self, lang):
raise NotImplementedError('Cannot delete a single string. '
'Perhaps you wan to delete all of %s.%s?' %
(self.instance, self.stringclass._attrname)
)
class StringExpression(ColumnOperators):
def __init__(self, prop, lang):
self.prop = prop
self.column = getattr(prop.stringclass, prop.colname)
self.lang_column = prop.stringclass._language_identifier
if isinstance(lang, basestring):
self.lang = lang
else:
self.lang = lang.identifier
def operate(self, op, *values, **kwargs):
return getattr(self.prop.cls, self.prop.stringclass._attrname).any(and_(
self.lang_column == self.lang,
op(self.column, *values, **kwargs),
))
class DefaultLangProperty(object):
def __init__(self, colname):
self.colname = colname