Field objects inherit from the DAL Expression class, which overloads the
"==" operator, which produces a Query object rather than actually testing
for equality. So, when comparing the argument passed to index() against
Field objects in the list, you will never get a False. If the first item in
the list is a Field object, you'll have an apparent match, which will
return index 0. Here's a workaround:
index = [str(f) for f in fields].index(str(t.myfield))
That compares the string representations of the fields rather than the
Field objects themselves.
Anthony
On Thursday, August 16, 2012 9:31:51 AM UTC-4, simon wrote:
>
> Please can someone explain why, for a list of fields, that
> fields.index("anything at all") always evaluates to 0.
>
> For example this prints 23 and 0.
>
> t=db.todo
> fields = [t.id, t.customer, t.subject, t.completed, t.modified_by]
> if 23 in fields: print("23 is in there")
> print(fields.index("hshshshs"))
>
>
> ........what I want to do is remove a field from a list of fields
> <fields.remove(t.customer)> just removes the first field in the list.
>
>
> On Thursday, August 16, 2012 9:31:51 AM UTC-4, simon wrote:
>
> Please can someone explain why, for a list of fields, that
> fields.index("anything at all") always evaluates to 0.
>
> For example this prints 23 and 0.
>
> t=db.todo
> fields = [t.id, t.customer, t.subject, t.completed, t.modified_by]
> if 23 in fields: print("23 is in there")
> print(fields.index("hshshshs"))
>
>
> ........what I want to do is remove a field from a list of fields
> <fields.remove(t.customer)> just removes the first field in the list.
>
>
>
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