solve multiple error

app/Http/Controllers/SoController.php

@@ -44,7 +44,7 @@ class SoController extends Controller
 
         //shipping order
         $so = new So;
-        $so->ff_id = $request->input('ff_id');
+        $so->ff_id = Auth::user()->company()->id;
         $so->supplier_company_name = $request->input('supplier_company_name');
         $so->supplier_contact_person = $request->input('supplier_contact_person');
         $so->supplier_contact_person_no = $request->input('supplier_contact_person_no');

app/So.php

@@ -17,7 +17,12 @@ class So extends Model
 
     public function Soitem()
     {
-        return $this->hasMany('App\Soitem', 'so_id');
+        return $this->hasMany('App\Soitem');
+    }
+
+    public function company()
+    {
+        return $this->belongsTo('App\Company');
     }
 
 

database/migrations/2018_05_07_062017_create_sos_table.php

@@ -15,17 +15,11 @@ class CreateSosTable extends Migration
     {
         Schema::create('sos', function (Blueprint $table) {
             $table->increments('id');
-
-            //Order details
             $table->integer('ff_id');
             $table->string('supplier_company_name');
             $table->string('supplier_contact_person');
             $table->integer('supplier_contact_person_no');
-
-            //Delivery details
             $table->integer('delivery_id');
-           
-            //Warehouse details
             $table->integer('warehouse_id');
             $table->timestamps();
 

database/migrations/2018_06_06_074452_add_foreign_key_comid_to_the_sos_table.php

@@ -0,0 +1,38 @@
+<?php
+
+use Illuminate\Support\Facades\Schema;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Database\Migrations\Migration;
+
+class AddForeignKeyComidToTheSosTable extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::table('sos', function (Blueprint $table) {
+            
+            // foreign key for the company table
+             $table->unsignedInteger('com_id');
+             $table->foreign('com_id')
+                   ->references('id')->on('companies')
+                   ->onDelete('cascade');
+
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::table('sos', function (Blueprint $table) {
+            //
+        });
+    }
+}

database/seeds/SoSeeder.php

@@ -16,14 +16,15 @@ class SoSeeder extends Seeder
          DB::table('sos')->insert([
           
         'id' => '9999',
-        'ff_id' => '4', 
+        'ff_id' => '1', 
         'supplier_company_name' => 'SEED',
         'supplier_contact_person' => 'SEED',
         'supplier_contact_person_no' => '1234',
-        'delivery_id' => '4',
-        'warehouse_id' => '4',
+        'delivery_id' => '1',
+        'warehouse_id' => '1',
         'created_at' => Carbon::now()->format('Y-m-d H:i:s'),
         'updated_at' => Carbon::now()->format('Y-m-d H:i:s'),
+
        ]);
     }
 }

database/seeds/SoitemSeeder.php

@@ -32,7 +32,7 @@ class SoitemSeeder extends Seeder
         'packaging_width' => '1',
         'packaging_depth' => '1',
         'packaging_gross' => '1',
-        'packaging_nett' => '41',
+        'packaging_nett' => '1',
         'created_at' => Carbon::now()->format('Y-m-d H:i:s'),
         'updated_at' => Carbon::now()->format('Y-m-d H:i:s'),
 
@@ -53,7 +53,7 @@ class SoitemSeeder extends Seeder
         'packaging_width' => '1',
         'packaging_depth' => '1',
         'packaging_gross' => '1',
-        'packaging_nett' => '41',
+        'packaging_nett' => '1',
         'created_at' => Carbon::now()->format('Y-m-d H:i:s'),
         'updated_at' => Carbon::now()->format('Y-m-d H:i:s'),
         ]),