/usr/lib/python2.7/dist-packages/formalchemy/ext/rdf.py is in python-formalchemy 1.4.2-1.
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__doc__ = """This module provides an experimental subclass of
:class:`~formalchemy.forms.FieldSet` to support RDFAlchemy_.
.. _RDFAlchemy: http://www.openvest.com/trac/wiki/RDFAlchemy
Usage
=====
>>> from rdfalchemy.samples.company import Company
>>> c = Company(stockDescription='description', symbol='FA',
... cik='cik', companyName='fa corp',
... stock=['value1'])
>>> fs = FieldSet(Company)
>>> fs.configure(options=[fs.stock.set(options=['value1', 'value2'])])
>>> fs = fs.bind(c)
>>> fs.stock.value
['value1']
>>> print fs.render().strip() # doctest: +ELLIPSIS +NORMALIZE_WHITESPACE
<div>
<label class="field_opt" for="Company--stockDescription">Stockdescription</label>
<input id="Company--stockDescription" name="Company--stockDescription" type="text" value="description" />
</div>
...
<div>
<label class="field_opt" for="Company--stock">Stock</label>
<select id="Company--stock" name="Company--stock">
<option selected="selected" value="value1">value1</option>
<option value="value2">value2</option>
</select>
</div>
>>> fs = Grid(Company, [c])
>>> fs.configure(options=[fs.stock.set(options=['value1', 'value2'])], readonly=True)
>>> print fs.render().strip() #doctest: +NORMALIZE_WHITESPACE
<thead>
<tr>
<th>Stockdescription</th>
<th>Companyname</th>
<th>Cik</th>
<th>Symbol</th>
<th>Stock</th>
</tr>
</thead>
<tbody>
<tr class="even">
<td>description</td>
<td>fa corp</td>
<td>cik</td>
<td>FA</td>
<td>value1</td>
</tr>
</tbody>
"""
from formalchemy.forms import FieldSet as BaseFieldSet
from formalchemy.tables import Grid as BaseGrid
from formalchemy.fields import Field as BaseField
from formalchemy.forms import SimpleMultiDict
from formalchemy import fields
from formalchemy import validators
from formalchemy import fatypes
from sqlalchemy.util import OrderedDict
from rdfalchemy import descriptors
from datetime import datetime
__all__ = ['Field', 'FieldSet']
class Session(object):
"""A SA like Session to implement rdf"""
def add(self, record):
"""add a record"""
record.save()
def update(self, record):
"""update a record"""
record.save()
def delete(self, record):
"""delete a record"""
def query(self, model, *args, **kwargs):
raise NotImplementedError()
def commit(self):
"""do nothing since there is no transaction in couchdb"""
remove = commit
class Field(BaseField):
""""""
@property
def value(self):
if not self.is_readonly() and self.parent.data is not None:
v = self._deserialize()
if v is not None:
return v
return getattr(self.model, self.name)
@property
def model_value(self):
return getattr(self.model, self.name)
raw_value = model_value
def sync(self):
"""Set the attribute's value in `model` to the value given in `data`"""
if not self.is_readonly():
setattr(self.model, self.name, self._deserialize())
class FieldSet(BaseFieldSet):
__sa__ = False
_mapping = {
descriptors.rdfSingle: fatypes.String,
descriptors.rdfMultiple: fatypes.List,
descriptors.rdfList: fatypes.List,
}
def __init__(self, model, **kwargs):
BaseFieldSet.__init__(self, model, **kwargs)
BaseFieldSet.rebind(self, model, data=kwargs.get('data', None))
for k, v in model.__dict__.iteritems():
if not k.startswith('_'):
descriptor = type(v)
t = self._mapping.get(descriptor)
if t:
self.append(Field(name=k, type=t))
def bind(self, model=None, session=None, data=None):
"""Bind to an instance"""
if not (model or session or data):
raise Exception('must specify at least one of {model, session, data}')
if not model:
if not self.model:
raise Exception('model must be specified when none is already set')
else:
model = self.model()
# copy.copy causes a stacktrace on python 2.5.2/OSX + pylons. unable to reproduce w/ simpler sample.
mr = object.__new__(self.__class__)
mr.__dict__ = dict(self.__dict__)
# two steps so bind's error checking can work
mr.rebind(model, session, data)
mr._fields = OrderedDict([(key, renderer.bind(mr)) for key, renderer in self._fields.iteritems()])
if self._render_fields:
mr._render_fields = OrderedDict([(field.key, field) for field in
[field.bind(mr) for field in self._render_fields.itervalues()]])
return mr
def rebind(self, model, session=None, data=None):
if model:
if isinstance(model, type):
try:
model = model()
except:
raise Exception('%s appears to be a class, not an instance, but FormAlchemy cannot instantiate it. (Make sure all constructor parameters are optional!)' % model)
self.model = model
self._bound_pk = None
if data is None:
self.data = None
elif hasattr(data, 'getall') and hasattr(data, 'getone'):
self.data = data
else:
try:
self.data = SimpleMultiDict(data)
except:
raise Exception('unsupported data object %s. currently only dicts and Paste multidicts are supported' % self.data)
class Grid(BaseGrid, FieldSet):
def __init__(self, cls, instances=None, **kwargs):
FieldSet.__init__(self, cls, **kwargs)
self.rows = instances or []
self.readonly = False
self._errors = {}
def _get_errors(self):
return self._errors
def _set_errors(self, value):
self._errors = value
errors = property(_get_errors, _set_errors)
def rebind(self, instances=None, session=None, data=None):
FieldSet.rebind(data=data)
if instances is not None:
self.rows = instances
def _set_active(self, instance, session=None):
FieldSet.rebind(self, instance, session or self.session, self.data)
def test_sync():
from rdfalchemy.samples.company import Company
c = Company(stockDescription='description', symbol='FA',
cik='cik', companyName='fa corp',
stock=['value1'])
fs = FieldSet(Company)
fs.configure(include=[fs.companyName, fs.stock.set(options=['value1', 'value2'])])
fs = fs.bind(c, data={'Company--companyName':'new name', 'Company--stock':'value2'})
assert fs.stock.raw_value == ['value1']
fs.validate()
fs.sync()
assert fs.stock.raw_value == ['value2']
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