Seeding data in Laravel - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to run all seeders in Laravel.

Laravel

php artisan [1]

Drag options to blanks, or click blank then click option'

Adb:seed

Bmigrate

Cmake:seeder

Dcache:clear

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'migrate' instead of 'db:seed' runs migrations, not seeders.

Using 'make:seeder' creates a seeder file but does not run it.

Use php artisan db:seed to run all seeders and populate the database.

2fill in blank

medium

Complete the code to create a new seeder class named UserSeeder.

Laravel

php artisan [1] UserSeeder

Drag options to blanks, or click blank then click option'

Adb:seed

Bmake:seeder

Cmigrate

Droute:list

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'db:seed' runs seeders but does not create files.

Using 'migrate' runs migrations, unrelated to seeder creation.

The command php artisan make:seeder UserSeeder creates a new seeder class file.

3fill in blank

hard

Fix the error in the run method to insert a user with name 'Alice'.

Laravel

public function run()
{
    DB::table('users')->[1]([
        'name' => 'Alice',
        'email' => '[e-mail]',
        'password' => bcrypt('password')
    ]);
}

Drag options to blanks, or click blank then click option'

Aupdate

Bselect

Cdelete

Dinsert

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'update' tries to change existing records but no condition is given.

Using 'delete' or 'select' does not add data.

Use insert to add new records to the database table.

4fill in blank

hard

Fill both blanks to call the UserSeeder from DatabaseSeeder.

Laravel

public function run()
{
    $this->[1](UserSeeder::[2]);
}

Drag options to blanks, or click blank then click option'

Acall

Bclass

Cexecute

Dstart

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'execute' or 'start' are not Laravel seeder methods.

Calling UserSeeder without '::class' will cause errors.

Use $this->call(UserSeeder::class) to run the UserSeeder from DatabaseSeeder.

5fill in blank

hard

Fill all three blanks to create a factory-based seeder for 10 users.

Laravel

public function run()
{
    User::[1]([2])->[3]();
}

Drag options to blanks, or click blank then click option'

Afactory

B10

Ccreate

Dmake

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'make' instead of 'create' will not save users to the database.

Omitting the number will create only one user.

Use User::factory(10)->create(); to generate and save 10 users using factories.

Practice

1. What is the main purpose of a seeder in Laravel?

easy

A. To fill the database with sample or default data automatically

B. To create database tables and columns

C. To handle user authentication

D. To manage application routes

Solution

1. Step 1: Understand the role of seeders

   Seeders are designed to insert data into the database automatically for testing or initial setup.

2. Step 2: Differentiate from other Laravel features

   Creating tables is done by migrations, authentication by middleware, and routes by route files, not seeders.

3. Final Answer:

   To fill the database with sample or default data automatically -> Option A

4. Quick Check:

   Seeder purpose = fill database with data [OK]

Hint: Seeders add data, migrations create tables [OK]

Common Mistakes:

• Confusing seeders with migrations
• Thinking seeders manage routes
• Assuming seeders handle authentication

2. Which command creates a new seeder class in Laravel?

easy

A. php artisan make:seeder SeederName

B. php artisan create:seeder SeederName

C. php artisan seed:create SeederName

D. php artisan generate:seeder SeederName

Solution

1. Step 1: Recall Laravel artisan commands for seeders

   The correct command to create a seeder is php artisan make:seeder SeederName.

2. Step 2: Identify incorrect command formats

   Other options use wrong verbs like create, seed:create, or generate which are not valid artisan commands.

3. Final Answer:

   php artisan make:seeder SeederName -> Option A

4. Quick Check:

   Seeder creation command = make:seeder [OK]

Hint: Use 'make:seeder' to create seeders [OK]

Common Mistakes:

• Using 'create:seeder' instead of 'make:seeder'
• Confusing seeder creation with migration creation
• Typing artisan commands with wrong verbs

3. Given this seeder code snippet, what will be the result after running php artisan db:seed --class=UserSeeder?

public function run() {
  DB::table('users')->insert([
    ['name' => 'Alice', 'email' => '[e-mail]'],
    ['name' => 'Bob', 'email' => '[e-mail]']
  ]);
}

medium

A. Only one user will be added because insert accepts one record at a time

B. The users table will be emptied before adding Alice and Bob

C. An error will occur because the insert method requires a single array

D. Two new users named Alice and Bob will be added to the users table

Solution

1. Step 1: Understand DB insert with array of arrays

   Passing an array of arrays to insert adds multiple records at once.

2. Step 2: Confirm no truncation or errors in code

   The code inserts two users without deleting existing data, and the syntax is correct.

3. Final Answer:

   Two new users named Alice and Bob will be added to the users table -> Option D

4. Quick Check:

   Insert multiple records = array of arrays [OK]

Hint: Insert accepts array of arrays for multiple rows [OK]

Common Mistakes:

• Assuming insert deletes existing data
• Thinking insert only accepts one record
• Expecting an error from multiple inserts

4. What is wrong with this seeder code?

public function run() {
  DB::table('products')->insert(
    ['name' => 'Book', 'price' => 10],
    ['name' => 'Pen', 'price' => 2]
  );
}

medium

A. The run method must return a value

B. The table name 'products' is invalid and causes an error

C. The insert method expects a single array, but two arrays are passed separately

D. The price values must be strings, not integers

Solution

1. Step 1: Check insert method parameter format

   The insert method expects one array argument. Passing two separate arrays causes a syntax error.

2. Step 2: Identify correct way to insert multiple rows

   Multiple rows should be inside a single array: an array of arrays.

3. Final Answer:

   The insert method expects a single array, but two arrays are passed separately -> Option C

4. Quick Check:

   Insert needs one array argument [OK]

Hint: Wrap multiple records in one array for insert [OK]

Common Mistakes:

• Passing multiple arrays as separate arguments
• Thinking run method must return a value
• Assuming numeric values must be strings

5. You want to seed your database with 100 users having random names and emails using Laravel factories inside a seeder. Which code snippet correctly achieves this inside the run method?

hard

A. factory(User::class, 100)->make();

B. User::factory()->count(100)->create();

C. User::create()->factory()->count(100);

D. User::factory(100)->make();

Solution

1. Step 1: Recall Laravel factory syntax for creating multiple records

   The correct syntax is User::factory()->count(100)->create(); to generate and save 100 users.

2. Step 2: Identify incorrect factory usages

   User::create()->factory()->count(100); reverses method order, A uses old syntax, and D misses count method.

3. Final Answer:

   User::factory()->count(100)->create(); -> Option B

4. Quick Check:

   Factory count then create = correct [OK]

Hint: Use factory()->count(n)->create() to seed multiple records [OK]

Common Mistakes:

• Using old factory syntax
• Calling factory on create() result
• Omitting count() method for multiple records