Adust the as_table tag to render a pick link if appropriate
The templates are adjusted to pass on a 'reference' value, which
is the url_name of the view from which the entity should be picked.
The as_table (and related) function(s) construct and then pass on
this argument and enable takes_contex so that we have access to the
context of the enclosing template.
We only extract ReferenceProperties that end with '_link_id' since
that is how all RP's are currently named. It is not possible to
create a field with the same name as the RP, as GAE will try to
interpret it's contents as the key of an entity before even calling
any function we can override.
Patch by: Sverre Rabbelier
from types import UnicodeType
def gqn(val):
"""
The geographic quote name function; used for quoting tables and
geometries (they use single rather than the double quotes of the
backend quotename function).
"""
if isinstance(val, basestring):
if isinstance(val, UnicodeType): val = val.encode('ascii')
return "'%s'" % val
else:
return str(val)
class SpatialOperation(object):
"""
Base class for generating spatial SQL.
"""
def __init__(self, function='', operator='', result='', beg_subst='', end_subst=''):
self.function = function
self.operator = operator
self.result = result
self.beg_subst = beg_subst
try:
# Try and put the operator and result into to the
# end substitution.
self.end_subst = end_subst % (operator, result)
except TypeError:
self.end_subst = end_subst
@property
def sql_subst(self):
return ''.join([self.beg_subst, self.end_subst])
def as_sql(self, geo_col):
return self.sql_subst % self.params(geo_col)
def params(self, geo_col):
return (geo_col, self.operator)
class SpatialFunction(SpatialOperation):
"""
Base class for generating spatial SQL related to a function.
"""
def __init__(self, func, beg_subst='%s(%s, %%s', end_subst=')', result='', operator=''):
# Getting the function prefix.
kwargs = {'function' : func, 'operator' : operator, 'result' : result,
'beg_subst' : beg_subst, 'end_subst' : end_subst,}
super(SpatialFunction, self).__init__(**kwargs)
def params(self, geo_col):
return (self.function, geo_col)