Thank you very much Antony!
On Thu, Dec 11, 2014 at 5:01 PM, Anthony <abasta...@gmail.com> wrote: > Maybe something like this: > > def query_fields(query): > from gluon.dal import Query > fields = [] > for element in (query.first, query.second): > if isinstance(element, Field): > fields.append(element) > elif isinstance(element, Query): > fields.extend(query_fields(element)) > return fields > > The above will return a list of field objects. You could instead have it > return a list of field names (either using field.name, which returns only > the field name, or using str(field), which returns 'tablename.fieldname' > format), or directly check for the existence of a particular field. > > Note, when checking for a field match, don't do something like: > > db.mytable.myfield in list_of_field_objects > > or: > > any(db.mytable.myfield == field for field in list_of_field_objects) > > In both cases, the comparison operator will result in a Query object > (because of the ==), which will always yield True. Instead, use "is" or > compare the field names/string representations: > > any(db.mytable.myfield is field for field in list_of_field_objects) > > or: > > any(str(db.mytable.myfield) == str(field) for field in > list_of_field_objects) > > Anthony > > > On Thursday, December 11, 2014 9:51:44 AM UTC-5, Massimiliano wrote: >> >> Is there a way to know if a field is involved in a query inspecting the >> query object? >> >> Thank you >> -- >> Massimiliano >> > -- > Resources: > - http://web2py.com > - http://web2py.com/book (Documentation) > - http://github.com/web2py/web2py (Source code) > - https://code.google.com/p/web2py/issues/list (Report Issues) > --- > You received this message because you are subscribed to the Google Groups > "web2py-users" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to web2py+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/d/optout. > -- Massimiliano -- Resources: - http://web2py.com - http://web2py.com/book (Documentation) - http://github.com/web2py/web2py (Source code) - https://code.google.com/p/web2py/issues/list (Report Issues) --- You received this message because you are subscribed to the Google Groups "web2py-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to web2py+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
