Active Record pattern in Ruby on Rails - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to find a user by id using Active Record.

Ruby on Rails

user = User.[1](1)

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Afind

Bget

Csearch

Dlookup

Attempts:

3 left

💡 Hint

Common Mistakes

Using methods like 'get' or 'search' which do not exist in Active Record.

The find method retrieves a record by its primary key in Active Record.

2fill in blank

medium

Complete the code to create a new user record with Active Record.

Ruby on Rails

user = User.[1](name: "Alice", email: "[e-mail]")

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Amake

Bbuild

Cnew_record

Dcreate

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'build' which only builds but does not save the record.

The create method builds and saves a new record in one step.

3fill in blank

hard

Fix the error in the code to update a user's email attribute.

Ruby on Rails

user = User.find(1)
user.[1](email: "[e-mail]")

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Aupdate

Bchange

Cmodify

Dedit

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'change' or 'edit' which are not Active Record methods.

The update method changes attributes and saves the record.

4fill in blank

hard

Fill both blanks to query users with age greater than 30 and order by name.

Ruby on Rails

users = User.where("age [1] ?", 30).[2](:name)

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A>

Border

C<

Dsort

Attempts:

3 left

💡 Hint

Common Mistakes

Using '<' instead of '>' for filtering.

Using 'sort' which is not an Active Record method.

The where method filters records; use '>' to find ages greater than 30. The order method sorts results by a column.

5fill in blank

hard

Fill all three blanks to define a scope named 'active' that selects users with status 'active' and orders by created_at descending.

Ruby on Rails

scope :active, -> { where(status: [1]).[2](created_at: [3]) }

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A"active"

Border

C:desc

D"inactive"

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'inactive' instead of 'active' for status.

Using incorrect method names for ordering.

The scope filters users with status 'active', orders them by created_at in descending order using order and :desc.