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| Guest |
 Posted: Wed Sep 12, 2007 1:50 am |
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Guest
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I'm trying to write some generic code to do ErlyDB record validation.
Basically, what I want to do is pass a ErlyDB record and a list of
fields to validate to a data validation function like so:
validate(School) ->
validate_school(School, school:db_field_names()).
validate_school(School, [FieldName|T]) ->
case validate_field(School, FieldName,
school:get_field_value_via_reflection(FieldName)) of
{ok, School} ->
validate_school(School, T);
{error, Msg} ->
{error, Msg}
end;
validate_school(School, []) ->
{ok, School}.
validate_field(School, name, undefined) ->
{error, "School name is required"};
validate_field(School, city, undefined) ->
{error, "City is required"};
validate_field(School, postal_code, undefined) ->
{error, "Postal code is required"};
validate_field(School, _, _) ->
{ok, School}.
The part I'm missing is what I need to call to get a field name based
on value, the school:get_field_value_via_reflection() bit. I'm
certain that I'm missing something obvious, given my Erlang/ErlyWeb
newb status, so any pointers are really appreciated. Of course, if
there's a better, more Erlang-y way to do this I'd love to hear about
that too.
Thanks,
Kevin
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| Guest |
| Posted: Fri Sep 14, 2007 5:13 am |
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Guest
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To get the value of a field in an ErlyDB record, just do
school:FieldName(School).
FieldName is a variable in this case. For setters, use
school:FieldName(School, NewVal).
Yariv
On 9/11/07, Kevin A. Smith <kevin@hypotheticalabs.com> wrote:
>
> I'm trying to write some generic code to do ErlyDB record validation.
> Basically, what I want to do is pass a ErlyDB record and a list of
> fields to validate to a data validation function like so:
>
> validate(School) ->
> validate_school(School, school:db_field_names()).
>
> validate_school(School, [FieldName|T]) ->
> case validate_field(School, FieldName,
> school:get_field_value_via_reflection(FieldName)) of
> {ok, School} ->
> validate_school(School, T);
> {error, Msg} ->
> {error, Msg}
> end;
> validate_school(School, []) ->
> {ok, School}.
>
> validate_field(School, name, undefined) ->
> {error, "School name is required"};
> validate_field(School, city, undefined) ->
> {error, "City is required"};
> validate_field(School, postal_code, undefined) ->
> {error, "Postal code is required"};
> validate_field(School, _, _) ->
> {ok, School}.
>
> The part I'm missing is what I need to call to get a field name based
> on value, the school:get_field_value_via_reflection() bit. I'm
> certain that I'm missing something obvious, given my Erlang/ErlyWeb
> newb status, so any pointers are really appreciated. Of course, if
> there's a better, more Erlang-y way to do this I'd love to hear about
> that too.
>
> Thanks,
> Kevin
>
> >
>
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