I've got a multi-tenancy site that includes some tables that use the Tree 
behaviour. By multi-tenancy I mean that several different clients all store 
their data in the same database and they can only access and manage their 
own data.

For example, each client stores their departments in the 'departments' 
table. Each department has a client_id field, as well as parent_id, lft and 
rght. Each client will have one or more top level departments (where 
parent_id is null and client_id = $theirClientId).

My aim is to produce reports where the departments are ordered by parent 
department name -> child department name down through the tree to whatever 
level where the nodes at each level are also sorted. Ideally I'd user 
Tree->reorder when departments are added or updated so they are stored in 
the right order and I can simply sort by lft on find, but I'm finding that 
performance is poor. This is partly because if a new top level department 
is added I need to reorder where parent_id is null, and that impacts all 
top level departments not just those belonging to this client. That can 
trigger a lot of cascading updates.

Is there a way to either:
1) use Tree->reorder but pass in extra criteria (parent_id = null AND 
client_id = 123) or
2) Sort the data once it's been found - there plenty of examples using the 
lft column but that isn't correct if the title field isn't also sorted 
correctly when stored.

If the answer is 1 (which sounds right) it can still trigger an update of 
the complete tree if a new top level department is added that begins with 
'A', as all subsequent rows will have to be moved down.

What's the recommended approach?

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