CRUD with Eloquent in Laravel - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ component_behavior

intermediate

What is the output of this Eloquent create operation?

Consider the following Laravel Eloquent code that creates a new user record. What will be the value of $user->name after running this code?

Laravel

<?php
$user = User::create(['name' => 'Alice', 'email' => '[e-mail]', 'password' => bcrypt('secret')]);
echo $user->name;

A An error because password is not fillable

B Alice

C secret

D null

💡 Hint

Remember that the create method returns the saved model instance with attributes filled.

The create method saves the record and returns the model instance with all attributes accessible. Since 'name' is set to 'Alice', echoing $user->name outputs 'Alice'.

❓ state_output

intermediate

What is the result of this update operation on Eloquent model?

Given this code snippet, what will be the value of $user->email after the update?

Laravel

<?php
$user = User::find(1);
$user->email = '[e-mail]';
$user->save();
echo $user->email;

A old email value

B null

C An error because save() was not called

D [e-mail]

💡 Hint

The save method commits changes to the database and updates the model instance.

After setting the email attribute and calling save(), the model instance reflects the updated email. So echoing $user->email outputs the new email.

📝 Syntax

advanced

Which option correctly deletes a user by ID using Eloquent?

You want to delete a user with ID 5. Which code snippet will successfully delete the user without errors?

A User::destroy(5);

B User::delete(5);

C User::find(5)->remove();

D User::find(5)->deleteUser();

💡 Hint

Check the correct static method for deleting by ID in Eloquent.

The destroy method deletes records by primary key. delete() is an instance method, not static. remove() and deleteUser() do not exist.

🔧 Debug

advanced

Why does this Eloquent update not change the database?

Look at this code snippet. The user's name is changed but the database does not update. What is the cause?

Laravel

<?php
$user = User::find(10);
$user->name = 'Bob';
// Missing save call

A Because save() was not called after changing the attribute

B Because find() returns null if user not found

C Because name is not a fillable attribute

D Because the database connection is not configured

💡 Hint

Changing attributes alone does not update the database without saving.

Eloquent requires calling save() to persist changes. Without save(), changes remain only in the model instance.

🧠 Conceptual

expert

What error occurs when trying to create a model without fillable attributes set?

Given a Laravel model with no $fillable or $guarded properties defined, what happens when you run User::create(['name' => 'Eve'])?

A A syntax error occurs

B The user is created successfully with name 'Eve'

C MassAssignmentException is thrown

D The create method returns null

💡 Hint

Laravel protects against mass assignment by default.

Without defining fillable or guarded, Laravel blocks mass assignment and throws a MassAssignmentException to prevent unsafe data insertion.