This is very wrong:
q1 = eval('db. userLanguage.'+ language )== True
what is it supposed to be?
q1 = db.userLanguage[language] == True
I am not sure. Once q1 is correct, this works:
results = db(q1 & q2).select()
On Wednesday, 25 June 2014 17:04:28 UTC-5, Riccardo C wrote:
>
> Dear all,
>
> I am trying to formulate a query to get ALL the people that know a
> language AND leave in a specific city.
> As I am not an expert I thought that was a good idea to have two tables as
> following:
> auth.settings.extra_fields['auth_user']= [
> Field('city',requires=IS_IN_SET(('UK - London','IT - Milano','USA - New
> York')) )]
>
>
> db.define_table('userLanguage',
> Field('idUser','reference auth_user', unique=True),
> Field('French','boolean',default = False),
> Field('Italian','boolean',default = False),
> Field('Chinese','boolean',default = False),
> Field('Indian','boolean',default = False))
>
> in term of controller search function I decided to get the information
> from the URL (that in my idea will be generate from a javascript function
> depending of what the user select on the page):
> def search():
>
> lstLanguages = ['French', 'Italian', 'Chinese', 'Indian']
>
> lstCity = ['UK - London','IT - Milano','USA - New York']
>
> language = lstLanguages[int(request.vars.n)]
> userCity = lstCity[int(request.vars.c)]
>
> q1 = eval('db. userLanguage.'+ language )== True
> q2 = db.auth_user.city == userCity
>
> """ QUERY: give me the list of users that know that language and live
> in that city"""
>
>
> return dict(form = chefResults)
>
> As written above I tried different way to do that (without succed):
>
> results = db(q1 & q2).select() """ gives me, as expected the sum of the
> two query results"""
> -------------------------------
> results2 = db(q1).select() '''this return those who speak the selected
> language'''
> searchresults = [row for row in results2 if results2.idUser_city ==
> userCity] '''this make web2py to crash! I have to kill the process...why?'''
>
> I hope to not have bother you too much, I would like to learn and
> understand... in particular:
> 1) which is the best way of doing this kind of query?
> 2) is there a better way of structuring the data (db tables)
> 3).... why it crashes?!
> 4) what would be the best way to pass the search criteria to the function?
>
> Thanks for any answer and I hope it might be useful for other people as
> well.
>
> Regards,
>
> Riccardo
>
>
>
>
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