Question

I got a little problem with datamapper, and I’d like to know if there is a quick solution.
Let’s say I have this kind of data

Groups table

id   |   Name
1    |   admin
2    |   guest
3    |   editor
4    |   moderator

In my base controller I set a global field to see only the groups that are not admin

$this->groups_ = new Group();
$this->groups_->where('id >', 1)->get();

//so I can select the users that are not admin
$users = new User();
$users->where_related('group',$id,$this->groups_)->get();

Now in my controllers I’d like to filter the groups. For example I want to select only editors and guests (id between 1 and 4). So I would like to filter the initial result set… something like this

$this->groups_->where('id <',4)->get();

But it doesn’t work. It returns ALL the group ids < 4 including admin.
What would be the right way to get this?

Answer 1

A possible solution

Maybe I found a possible workaround by cloning the datamapper object.
What I want to do is not to query the db multiple times, but I’d like to have a base resultset and refine the results.

So in my base controller I would do something like

$this->groups_ = new Group();
$this->groups_->where('id >', 1);//without getting the results

//so I can select the users that are not admin
$users = new User();
//here i'm getting the results from the clone
$users->where_related('group',$id,$this->groups_->get_clone()->get())->get();

And, as I left the object “open”, without getting the results, I can use it in my controllers, as a base for my other “queries”… ok,they are actually new conditions of the first query.

//now the query return the groups between 2, as I set in the base controller
//and 4, set in the child controller
$this->groups_->where('id <',4)->get();