Conditions array results in undefined

Rails
1

Hi!

I’m having another small problem. I run a small query to get all
the group_id’s that are associated with a user. I then take that and
run it in another query in order to display the relevant data/group ID
the user belongs in. But when I do this, sometimes it returns an
error because there’s ‘nomethod’ in array, and other times it returns
nothing. For example, this is my code…

def list
username = ‘bob’
resUser = User.find(:all, :conditions => [“username = :name”,
{:name => username}], :select => “group_id”)

@result_pages, @results = paginate :results, :per_page =>

10, :conditions => [“group_id IN (?)”, resUser]
end

In the logs, it does the first query, but for the second, it shows
‘null’.
SQL (0.000314) SELECT count(*) AS count_all FROM results WHERE
(group_id IN (NULL))

Now if I change some of the code to look like this…

username = 'bob'
resUser = User.find(:all, :conditions => ["username = :name",

{:name => username}])

@result_pages, @results = paginate :results, :per_page =>

10, :conditions => [“group_id IN (?)”, resUser.group_id]

It flashes an NoMethodError exception with…

undefined method `group_id’ for #Array:0x352ca94

To my knowledge, there were some tickets opened on this but it looks
like it has been fixed. One of them is here.

http://dev.rubyonrails.org/ticket/6150
http://dev.rubyonrails.org/ticket/2887

But I’m still having problems trying to get this to work. If anybody
can help, that would be great.

Thanks in advanced…

2

[email protected] wrote:

def list
username = ‘bob’
resUser = User.find(:all, :conditions => [“username = :name”,
{:name => username}], :select => “group_id”)

@result_pages, @results = paginate :results, :per_page =>

10, :conditions => [“group_id IN (?)”, resUser]
end

In both cases you seem to be expecting a sinlge user, but you are asking
for :all matching records instead of just one. Because of this you are
getting an array of users, not just one user. So when you call a method
like “group_id” you call it on the array, not the user object inside of
it.

Try this instead

res_user = User.find(:first, :conditions => {:username => ‘bob’})

3

That is true and that does work. But, users can belong to multiple
groups. So, for example, the table ‘users’ can look like this…

Username - Group_ID - Group
Bob - 1 - HR
Jim - 2 - OCF
Tim - 1 - HR
Mike - 3 - MED
Bob - 3 - MED

In the results table, a ‘result’ would belong to a group_id. So, if
‘Bob’ logs in, he should be able to view MED and HR results, but not
OCF. If I use the ‘first’ instead of ‘all’, then I only get the first
instance, which is ‘HR’. I hope that makes sense.

Thank you again for any help!

On Apr 3, 5:46 pm, Alex W. [email protected]