i bet that by the time your lambda is running the point has been converted
to a string already. can you see if that is true? i'm not sure how to
invoke db functions in a lambda of a virtual field. :(
On Wednesday, January 1, 2014 5:50:54 PM UTC-8, User wrote:
>
> Suppose I have a table like:
>
> db.define_table('location',
> Field(name, 'string'),
> Field('point', 'geometry()')
> )
>
> I want to have the latitude and longitude as attributes also (whose value
> can be derived from the point field). So I try this:
>
> db.define_table('location',
> Field(name, 'string'),
> Field('point', 'geometry()'),
> Field.Virtual('latitude', lambda row: row.location.point.st_x()),
> Field.Virtual('longitude', lambda row: row.location.point.st_y()),
> )
>
> But it doesn't work and fails silently. The model just doesn't have
> latitude or longitude fields. I also tried with Field.Method but this
> complains that 'point' is of typer str.
>
> I guess the complication is that st_x() translates into a database
> function. I'm thinking about parsing the point string which is of the form
> "POINT(x y)" as a workaround but I'd rather use st_x if someone can show me
> how.
>
--
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/groups/opt_out.
