2005-10-26
?is_nothing in Freemarker
obj?if_exists will return an instance of GeneralPurposeNothing if obj not exists,
how can we get know wether obj == "" or obj don't exists as obj?if_exsist just return "" for the both.
here is the solution
how can we get know wether obj == "" or obj don't exists as obj?if_exsist just return "" for the both.
here is the solution
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