le 30.09.2008 13:28 Wolverine a écrit:
> Hello.
> First of all I'd like to apologize if this is not the right group to
> post this.
>
> I have a portion of the code that gives me an error, while I think it
> shouldn't. I'm trying to construct string for eval function that will
> return a variable with value of or_ sqlalchemy parameter. I'm not really
> sure if what I'm trying to achieve should be done differently. I have a
> friends_list which is basically list of Friend records. I want to select
> Posts like it's shown below.
>
> Unfortunately eval(evalstr) gives me syntax error. The error is on
> eval(evalstr) function which states *<type 'exceptions.SyntaxError'>:
> invalid syntax (<string>, line 1)*. I think this is because of
> model.Post.account.id, so or_() cannot follow the relation Post.account.
> I couldn't think of a better idea for this and quite frankly I'm not an
> sql expert, so please forgive if I'm asking stupid questions.
>
> Is it a bug in elixir or am I doing something wrong? If there's a way
> for doing this in pure sql, could someone please tell me how can this be
> achieved? I'd greatly appreciate it.
>
> Thanks a lot.
> Karol Tomala
>
> --- cut ---
> evalstr = 'or_clause = or_('
> for i in (0, friends_count - 1):
> friend = friends_list[i]
> if i < friends_count - 1:
> sep = ', '
> else:
> sep = ''
> evalstr += 'model.Post.account.id == %d%s' %
> (friend.friend.id, sep)
> evalstr += ')'
> eval(evalstr)
>
>
why don't you simply do something like that :
conditions = []
for i in (0, friends_count - 1):
friend = friends_list[i]
conditions.append(model.Post.account.id == friend.friend.id)
or_clause = or_(*conditions)
> post_obj_list = model.Post.query().filter(
> or_(
> and_(model.Post.account == account_obj,
> model.Post.parent == None),
> and_(or_clause, model.Post.visibility == 0)
> )
> ).order_by(model.Post.postdate.desc()).limit(10).all()
>
>
> >
>
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