Solutions

database/migrations/task1/2021_11_08_091231_create_tasks_table.php

@@ -15,7 +15,7 @@ public function up()
     {
         Schema::create('tasks', function (Blueprint $table) {
             $table->id();
-            $table->bigInteger('user_id');
+            $table->unsignedBigInteger('user_id');
             $table->foreign('user_id')->references('id')->on('users');
             $table->string('name');
             $table->timestamps();

database/migrations/task1/2021_11_08_092943_create_comments_table.php

@@ -15,10 +15,10 @@ public function up()
     {
         Schema::create('comments', function (Blueprint $table) {
             $table->id();
-            $table->unsignedInteger('user_id');
+            $table->unsignedBigInteger('user_id');
             $table->foreign('user_id')->references('id')->on('users');
-            $table->unsignedInteger('comment_id');
-            $table->foreign('comment_id')->references('id')->on('comments');
+            // $table->unsignedBigInteger('comment_id');
+            // $table->foreign('comment_id')->references('id')->on('comments');
             $table->string('comment_text');
             $table->timestamps();
         });

database/migrations/task10/2021_11_09_090858_create_visitors_table.php

@@ -16,7 +16,7 @@ public function up()
         // TASK: edit this migration so country_id would allow NULL values
         Schema::create('visitors', function (Blueprint $table) {
             $table->id();
-            $table->foreignId('country_id')->constrained();
+            $table->foreignId('country_id')->nullable()->constrained();
             $table->string('ip_address');
             $table->timestamps();
         });

database/migrations/task2/2021_11_09_075928_add_surname_to_users_table.php

@@ -16,6 +16,7 @@ public function up()
         Schema::table('users', function (Blueprint $table) {
             // TASK: Add a string field "surname" which would go after the field "name"
             // Write code here
+            $table->string('surname')->after('name');
         });
     }
 

database/migrations/task3/2021_11_09_080955_create_projects_table.php

@@ -19,6 +19,7 @@ public function up()
             $table->timestamps();
 
             // TASK: Add soft deletes column here
+            $table->softDeletes();
         });
     }
 

database/migrations/task4/2021_11_09_082205_create_products_table.php

@@ -16,7 +16,7 @@ public function up()
         // TASK: Edit this file, so that deleting category would auto-delete its products
         Schema::create('products', function (Blueprint $table) {
             $table->id();
-            $table->foreignId('category_id')->constrained();
+            $table->foreignId('category_id')->constrained()->onDelete('cascade');
             $table->string('name');
             $table->timestamps();
         });

database/migrations/task5/2021_11_09_083121_update_users_table.php

@@ -14,9 +14,11 @@ class UpdateUsersTable extends Migration
     public function up()
     {
         // TASK: add an if-statement in this file to NOT add column if it already exists
-        Schema::table('users', function (Blueprint $table) {
-            $table->string('name');
-        });
+        if (!Schema::hasColumn('users', 'name')) {
+            Schema::table('users', function (Blueprint $table) {
+                $table->string('name');
+            });
+        }
     }
 
     /**

database/migrations/task5/2021_11_09_083225_recreate_users_table.php

@@ -14,15 +14,17 @@ class RecreateUsersTable extends Migration
     public function up()
     {
         // TASK: add an if-statement in this file to NOT create table if it already exists
-        Schema::create('users', function (Blueprint $table) {
-            $table->id();
-            $table->string('name');
-            $table->string('email')->unique();
-            $table->timestamp('email_verified_at')->nullable();
-            $table->string('password');
-            $table->rememberToken();
-            $table->timestamps();
-        });
+        if (!Schema::hasTable('users')) {
+            Schema::create('users', function (Blueprint $table) {
+                $table->id();
+                $table->string('name');
+                $table->string('email')->unique();
+                $table->timestamp('email_verified_at')->nullable();
+                $table->string('password');
+                $table->rememberToken();
+                $table->timestamps();
+            });
+        }
     }
 
     /**

database/migrations/task6/2021_11_09_083843_create_companies_table.php

@@ -16,7 +16,7 @@ public function up()
         // TASK: edit this migration so there couldn't be two companies with the same name
         Schema::create('companies', function (Blueprint $table) {
             $table->id();
-            $table->string('name');
+            $table->string('name')->unique();
             $table->timestamps();
         });
     }

database/migrations/task7/2021_11_09_084922_create_new_companies_table.php

@@ -17,7 +17,7 @@ public function up()
         // its automatic value of name would be "My company"
         Schema::create('companies', function (Blueprint $table) {
             $table->id();
-            $table->string('name');
+            $table->string('name')->default('My company');
             $table->timestamps();
         });
     }

database/migrations/task8/2021_11_09_085453_rename_companies_table.php

@@ -14,6 +14,7 @@ class RenameCompaniesTable extends Migration
     public function up()
     {
         // TASK: add a migration to rename table "company" into "companies"
+        Schema::rename('company', 'companies');
     }
 
     /**

database/migrations/task9/2021_11_09_090018_rename_name_in_companies_table.php

@@ -16,6 +16,7 @@ public function up()
         // TASK: write the migration to rename the column "title" into "name"
         Schema::table('companies', function (Blueprint $table) {
             // Write code here
+            $table->renameColumn("title", "name");
         });
     }