Expression value column widget problem

[EricTsuei]

this bug happens after save and refresh pages, not happens while just save.

[remkonoteboom]

It's possible that it TACTIC is caching the value and is pulling the value from the cache. The expression language is heavily cached and which will speed up repeated expressions considerably.

Try replacing this:

value = Search.eval(value, env_sobjects=env_sobjects)

with:

from pyasm.biz import ExpressionParser
parser = ExpressionParser()
parser.eval(value, env_sobjects=env_sobjects, use_cache=False)

and let me know if this fixes the problem.

[EricTsuei]

sorry, but this code can't works.
give me error

[EricTsuei]

I have try both of these code. both can't work.
from pyasm.biz import ExpressionParser
parser = ExpressionParser()
parser.eval(value, env_sobjects=env_sobjects, use_cache=False)

from pyasm.biz import ExpressionParser
parser = ExpressionParser()
value = parser.eval(value, env_sobjects=env_sobjects, use_cache=False)

[EricTsuei]

when I replace this
value = parser.eval(value, env_sobjects=env_sobjects, use_cache=False)

with this
value = parser.eval(value, env_sobjects=env_sobjects)

this code can run, but the results are the same as using Search.eval().

---

I have found a todo in expression_test.py

TODO: add a use_cache=False kwargs to eval()
maybe I am using tactic 4.5, use_cache kwargs not add yet?

def _test_cache(my):
expr = '@COUNT(unittest/person)'
parser = ExpressionParser()
result = parser.eval(expr, single=True)
my.assertEquals(result, 8)
person = Person.create( "new_person" , "Mr",
"Z" , "Fake Unittest Person Z")
person.set_value("age", "300")
person.commit()
"""TODO: add a use_cache=False kwargs to eval()
expr = '@SOBJECT( unittest/person)'
search = Search('unittest/person')
print "LEN ", len(search.get_sobjects())
parser = ExpressionParser()
result = parser.eval(expr)
print "RES ", result
my.assertEquals(len(result), 9)
"""

[remkonoteboom]

Yes. I checked the code and the use_cache kwarg is not in 4.5. There is another way, but it is a bit of a blunt instrument. You can clear the entire expression cache using.

parser = ExpressionParser()
parser.clear_cache()
result = parser.eval(expr)

The only impact is performance if a large number of similar expressions are called. This is why the use_cache kwarg is better, but clear_cache is available in 4.5 and if isolated to ExpressionValueWdg, it's not so bad.

[EricTsuei]

ok, seems works now. Thanks