Lots of changes

app/Models/Activity.php

@@ -0,0 +1,50 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use Illuminate\Database\Eloquent\SoftDeletes;
+
+class Activity extends Model
+{
+    /** @use HasFactory<\Database\Factories\ActivityFactory> */
+    use HasFactory;
+    use SoftDeletes;
+
+    protected $fillable = [
+        'due_date',
+        'amount',
+        'note',
+        'action_id',
+        'decision_id'
+    ];
+
+    protected $hidden = [
+        'action_id',
+        'decision_id',
+        'client_case_id',
+        'contract_id'
+    ];
+
+    public function action(): BelongsTo
+    {
+        return $this->belongsTo(\App\Models\Action::class);
+    }
+
+    public function decision(): BelongsTo
+    {
+        return $this->belongsTo(\App\Models\Decision::class);
+    }
+
+    public function clientCase(): BelongsTo
+    {
+        return $this->belongsTo(\App\Models\ClientCase::class);
+    }
+
+    public function contract(): BelongsTo|null
+    {
+        return $this->belongsTo(\App\Models\Contract::class);
+    }
+}