laravel - 如何检查子子子关系是否存在

Question

My controller is receiving an AgentId

public function save(Int $agent_id, Request $request)

So now I need to check if current user has permission to handle this agent_id.

The problem is that they are not directly connect with a relation.

The path between these models is:

User -> hasMany Workspace -> hasMany Inventory -> hasOne Agent

So the question is: is there an easier/cleaner way to check if the User has connection with this Agent?

What I'm trying so far is to loop all items for each relation level.

Answer 1

Agent model has a relation with a User , because you can't create a child table row without its parent data. You can reach User table with join method, like this :

$q = Agent::select('agents.*')
    ->where('id', $agent_id)
    ->join('inventories', 'inventories.id', '=', 'agents.inventory_id')
    ->join('workspaces', 'workspaces.id', '=', 'inventories.workspace_id')
    ->join('users', 'users.id', '=', 'workspaces.workspace_id')
    ->get();