On Aug 22, 2012, at 4:37 PM, ThiefMaster wrote:
I think this is a bug; it should either result in an error or work as
expected - in python this **is** valid after all:
str(X.query.filter(2 X.id 5))
'SELECT x.id AS x_id \nFROM x \nWHERE x.id :id_1'
This shouldn't generate the following SQL
str(X.query.filter(2 X.id))
'SELECT x.id AS x_id \nFROM x \nWHERE x.id :id_1'
but rather this SQL:
str(X.query.filter(2 X.id, X.id 5))
'SELECT x.id AS x_id \nFROM x \nWHERE x.id :id_1 AND x.id :id_2'
Here, I will illustrate the bug here is a fact of Python itself. If I'm
missing how to make this work, apply it to the following script and I'll gladly
commit :
class MyComparator(object):
def __lt__(self, other):
return Binary(self, other, )
class Column(MyComparator):
def __init__(self, name):
self.name = name
def __str__(self):
return self.name
class Binary(MyComparator):
def __init__(self, left, right, operator):
self.left = left
self.right = right
self.operator = operator
def __str__(self):
return %s %s %s % (self.left, self.operator, self.right)
c1, c2, c3 = Column('c1'), Column('c2'), Column('c3')
# prints c1 c2
print c1 c2
# prints c1 c2 c3
print (c1 c2) c3
# prints c2 c3. the c1 c2 and c2 c3 are
# evaluated by __lt__() separately;
# the result of c1 c2 is lost and the expression
# only returns c2 c3 individually.
print c1 c2 c3
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