I tried with the sample code, and I get the following:
File "/Users/joshma/aurelia/benchling/models/folder.py", line 273, in
<module>
configure_mappers()
File
"/Users/joshma/.envs/aurelia/lib/python2.7/site-packages/sqlalchemy/orm/mapper.py",
line 2560, in configure_mappers
mapper._post_configure_properties()
File
"/Users/joshma/.envs/aurelia/lib/python2.7/site-packages/sqlalchemy/orm/mapper.py",
line 1673, in _post_configure_properties
prop.init()
File
"/Users/joshma/.envs/aurelia/lib/python2.7/site-packages/sqlalchemy/orm/interfaces.py",
line 143, in init
self.do_init()
File
"/Users/joshma/.envs/aurelia/lib/python2.7/site-packages/sqlalchemy/orm/relationships.py",
line 1509, in do_init
self._process_dependent_arguments()
File
"/Users/joshma/.envs/aurelia/lib/python2.7/site-packages/sqlalchemy/orm/relationships.py",
line 1566, in _process_dependent_arguments
self.target = self.mapper.mapped_table
File
"/Users/joshma/.envs/aurelia/lib/python2.7/site-packages/sqlalchemy/util/langhelpers.py",
line 712, in __get__
obj.__dict__[self.__name__] = result = self.fget(obj)
File
"/Users/joshma/.envs/aurelia/lib/python2.7/site-packages/sqlalchemy/orm/relationships.py",
line 1489, in mapper
configure=False)
File
"/Users/joshma/.envs/aurelia/lib/python2.7/site-packages/sqlalchemy/orm/base.py",
line 383, in class_mapper
raise exc.UnmappedClassError(class_)
UnmappedClassError: Class 'sqlalchemy.sql.schema.Sequence' is not mapped
I tried this with both mapper_configured and instrument_class. I'm using
postgres and primary_key, so I think the Sequence it's using is getting in
the way?
I understand it's not easy to debug a SQLA setup from afar; thanks in
advance for the responses.
- Josh
On Thu, Apr 17, 2014 at 10:07 PM, Michael Bayer <mike...@zzzcomputing.com>wrote:
> OK well this stage to create an Index is just not deferred enough, and
> text() is not supported. Declarative has to make a “name” column that is
> part of MyModel by copying it because it’s coming from a mixin and that
> just hasn’t happened yet, the Column is not the right object yet. The
> Table isn’t there. Index wasn’t designed with this case in mind, it
> doesn’t support string names the way UniqueConstraint does because it was
> intended to be constructed given Table bound columns after the Table is
> fully assembled. This is from the history of Table/Index/etc. to look just
> like DDL, the Index is created separately.
>
> easy enough to break out of helper methods and just use events,
> mapper_configured requires that mappers are configured, else use
> instrument_class and use class_.__table__.c.name instead:
>
> class MyMixin(object):
> name = Column('name', String(64), nullable=False)
>
> @event.listens_for(MyMixin, "mapper_configured", propagate=True)
> def add_index(mapper, class_):
> Index('mymodel_lower_name_idx', func.lower(class_.name),
> postgresql_ops={'name': 'text_pattern_ops'})
>
> class MyModel(MyMixin, Base):
> __tablename__ = 'foo'
>
> id = Column(Integer, primary_key=True)
>
> configure_mappers()
>
>
>
> https://bitbucket.org/zzzeek/sqlalchemy/issue/3028/support-text-in-index-thats-already-tableis
> added to support text()
>
>
>
>
> On Apr 18, 2014, at 12:24 AM, Joshua Ma <m...@josh.ma> wrote:
>
> Hi Mike,
>
> In hindsight I might have responded prematurely - got around to trying it
> and with text() I get the following:
>
> __table_args__ = (
> ...
> Index('folder_lower_name_idx', text('lower(name)'),
> postgresql_ops={'name': 'text_pattern_ops'}),
> )
>
> File
> "/Users/joshma/.envs/aurelia/lib/python2.7/site-packages/sqlalchemy/sql/schema.py",
> line 2798, in __init__
> ColumnCollectionMixin.__init__(self, *columns)
> File
> "/Users/joshma/.envs/aurelia/lib/python2.7/site-packages/sqlalchemy/sql/schema.py",
> line 2231, in __init__
> for c in columns]
> File
> "/Users/joshma/.envs/aurelia/lib/python2.7/site-packages/sqlalchemy/sql/schema.py",
> line 2223, in _to_schema_column_or_string
> raise exc.ArgumentError(msg % element)
> ArgumentError: Element <sqlalchemy.sql.elements.TextClause object at
> 0x108e2b910> is not a string name or column element
>
> With declared_attr:
>
> @declared_attr
> def __table_args__(cls):
> return (
> ...
> Index('folder_lower_name_idx', func.lower(cls.name),
> postgresql_ops={'name': 'text_pattern_ops'}),
> )
>
> File
> "/Users/joshma/.envs/aurelia/lib/python2.7/site-packages/flask_sqlalchemy.py",
> line 477, in __init__
> DeclarativeMeta.__init__(self, name, bases, d)
> File
> "/Users/joshma/.envs/aurelia/lib/python2.7/site-packages/sqlalchemy/ext/declarative/api.py",
> line 53, in __init__
> _as_declarative(cls, classname, cls.__dict__)
> File
> "/Users/joshma/.envs/aurelia/lib/python2.7/site-packages/sqlalchemy/ext/declarative/base.py",
> line 251, in _as_declarative
> **table_kw)
> File
> "/Users/joshma/.envs/aurelia/lib/python2.7/site-packages/sqlalchemy/sql/schema.py",
> line 352, in __new__
> table._init(name, metadata, *args, **kw)
> File
> "/Users/joshma/.envs/aurelia/lib/python2.7/site-packages/sqlalchemy/sql/schema.py",
> line 429, in _init
> self._init_items(*args)
> File
> "/Users/joshma/.envs/aurelia/lib/python2.7/site-packages/sqlalchemy/sql/schema.py",
> line 72, in _init_items
> item._set_parent_with_dispatch(self)
> File
> "/Users/joshma/.envs/aurelia/lib/python2.7/site-packages/sqlalchemy/sql/base.py",
> line 421, in _set_parent_with_dispatch
> self._set_parent(parent)
> File
> "/Users/joshma/.envs/aurelia/lib/python2.7/site-packages/sqlalchemy/sql/schema.py",
> line 2803, in _set_parent
> ColumnCollectionMixin._set_parent(self, table)
> File
> "/Users/joshma/.envs/aurelia/lib/python2.7/site-packages/sqlalchemy/sql/schema.py",
> line 2241, in _set_parent
> self.columns.add(col)
> File
> "/Users/joshma/.envs/aurelia/lib/python2.7/site-packages/sqlalchemy/sql/base.py",
> line 490, in add
> self[column.key] = column
> File
> "/Users/joshma/.envs/aurelia/lib/python2.7/site-packages/sqlalchemy/sql/base.py",
> line 499, in __setitem__
> if key in self:
> File
> "/Users/joshma/.envs/aurelia/lib/python2.7/site-packages/sqlalchemy/sql/base.py",
> line 554, in __contains__
> raise exc.ArgumentError("__contains__ requires a string argument")
> ArgumentError: __contains__ requires a string argument
>
> Is the functional index supported even if I'm using postgresql_ops? I've
> re-installed and upgraded to SQLAlchemy 0.9.4, same errors.
>
> - Josh
>
>
> On Thu, Apr 17, 2014 at 4:57 PM, Joshua Ma <m...@josh.ma> wrote:
>
>> Awesome, thanks so much for the quick response.
>>
>>
>> On Sun, Apr 13, 2014 at 7:00 PM, Michael Bayer
>> <mike...@zzzcomputing.com>wrote:
>>
>>> you need to turn your __table_args__ into a callable:
>>>
>>> @declared_attr
>>> def __table_args__(cls):
>>> return (Index(…, func.lower(cls.name), …), )
>>>
>>> or just use a string for your functional index: Index(…,
>>> text(“LOWER(name)”), …)
>>>
>>>
>>> On Apr 13, 2014, at 9:22 PM, Joshua Ma <m...@joshma.com> wrote:
>>>
>>> Is there a way to create a functional index in a declarative model
>>> without referencing the actual column? I currently have something like
>>>
>>> class MyModel(db.Base):
>>> name = db.Column('name', db.String(255))
>>> __table_args__ = (
>>> Index('mymodel_lower_name_idx', func.lower(name),
>>> postgresql_ops={'name': 'text_pattern_ops'}),
>>> )
>>>
>>> which is slightly inconvenient because I usually declare all my columns
>>> under __table_args__.
>>>
>>> More importantly, though, I use a mixin for some models, with the
>>> __table_args__ in the model and the column in the mixin:
>>>
>>> class MyMixin(object):
>>> name = db.Column(db.String(64), nullable=False)
>>>
>>> class MyModel(MyMixin, db.Base):
>>> __table_args__ = (
>>> Index('mymodel_lower_name_idx', func.lower(MyMixin.name),
>>> postgresql_ops={'name': 'text_pattern_ops'}),
>>> )
>>>
>>> but this doesn't seem to work, I get "ArgumentError: __contains__
>>> requires a string argument" at runtime.
>>>
>>> *The rest of my indices are just strings (e.g. Index('mymodel_name_idx',
>>> 'name')) - is there a similar way to create functional ones?* I tried
>>> 'lower(name)' but it doesn't like that either since it's not a valid column
>>> (KeyError: 'lower(name)').
>>>
>>> Thanks!
>>> Josh
>>>
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>>
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