Multi select with conditions

Ruby Apps Ferret
1

Hi

I’m doing a multi-model search like this, which works absolutely fine:

    @search_results = ActsAsFerret::find( "trumpet", [Resource,

Lesson,
Course],
#(ferret) options
{ :page => 1,
:per_page => 20,
:sort =>
Ferret::Search::SortField.new(:name, :reverse => false)
},
#find options
{}
)

My new problem is that the results need to be restricted: basically any
user
has only limited access to certain lessons, resources and courses,
depending
on their shared priveleges. I have methods to produce arrays of ids of
each
that the user is allowed to see, eg

@user.allowed_lessons
=> array of ids of all lessons the user has access to

Can anyone show me how to incorporate this into my search? I have the
feeling that i can do something with the :conditions options, which can
be
passed through in the find options hash. But i can’t work it out: i
tried
this:

:conditions => [“lesson.id in (?) or course.id in (?) or resource.id in
(?)”, @user.allowed_lessons, @user.allowed_courses,
@user.allowed_resources]

But it doesn’t work: it says ‘no such field as lesson.id in resources’.
I
feel like this should be possible - can anyone help?

thanks
max

2

I have the same problem Max, did you solve it?

Regards!

3

Hi Max,

Try this:

@search_results = ActsAsFerret::find(“trumpet”, [Resource, Lesson,
Course],
#(ferret) options
{ :page => 1,
:per_page => 20,
:sort =>
Ferret::Search::SortField.new(:name, :reverse => false)
},
#find options - note this assumes
it’s a flat array of allowed id numbers:
{ :lesson => “lessons.id IN
(#{@user.allowed_lessons.join(’,’)})”,
:course => “courses.id IN
(#{@user.allowed_courses.join(’,’)})”,
:resource => “resources.id IN
(#{@user.allowed_resources.join(’,’)})”
}
)

4

Sorry, I missed the :conditions key in the last hash
{ :conditions => {:lesson => “lessons.id IN
(#{@user.allowed_lessons.join(’,’)})”,
:course => “courses.id IN
(#{@user.allowed_courses.join(’,’)})”,
:resource => “resources.id IN
(#{@user.allowed_resources.join(’,’)})”
}
}

5

Thanks all

On the way to solving this i found a bug in acts_as_ferret - it seems
that if i try to sort, paginate and use conditions at the same time then
the sorting breaks down: instead of being sorted and then paginated,
the results are paginated (ordered simply by id) and then sorted within
each page.

I let Jens K. (and the acts as ferret mailing list) know about it
but as far as i know it’s not been fixed.

I ended up doing a ferret search to get the ids of the results (with
unallowed records filtered out), and then doing an AR find to get those
results, sort and paginate them. So, it’s a little inelegant but it
works, at least.

thanks
max