Custom post type queries in Wordpress - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to query posts of a custom post type named 'book'.

Wordpress

<?php
$args = array('post_type' => '[1]');
$query = new WP_Query($args);
?>

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

Apage

Bpost

Cbook

Dproduct

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'post' instead of the custom post type name.

Using 'page' which queries pages, not custom posts.

The 'post_type' argument specifies which type of posts to query. Using 'book' queries the custom post type named 'book'.

2fill in blank

medium

Complete the code to get only published posts of the custom post type 'movie'.

Wordpress

<?php
$args = array('post_type' => 'movie', 'post_status' => '[1]');
$query = new WP_Query($args);
?>

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

Apublish

Bpending

Cprivate

Ddraft

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'draft' which returns unpublished posts.

Using 'private' which returns posts visible only to admins.

The 'post_status' argument filters posts by their status. 'publish' means only published posts are returned.

3fill in blank

hard

Fix the error in the code to query 'event' posts ordered by date descending.

Wordpress

<?php
$args = array(
  'post_type' => 'event',
  'orderby' => '[1]',
  'order' => 'DESC'
);
$query = new WP_Query($args);
?>

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

Adate

Btitle

Cmenu_order

Dauthor

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'title' which orders alphabetically by title.

Using 'author' which orders by author name.

To order posts by their published date, use 'orderby' => 'date'.

4fill in blank

hard

Fill both blanks to query 'product' posts with a meta key 'price' greater than 20.

Wordpress

<?php
$args = array(
  'post_type' => 'product',
  'meta_query' => array(
    array(
      'key' => '[1]',
      'value' => 20,
      'compare' => '[2]'
    )
  )
);
$query = new WP_Query($args);
?>

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

Aprice

B>

C<

Dcost

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'cost' instead of 'price' as meta key.

Using '<' which filters for prices less than 20.

The 'meta_query' filters posts by custom fields. Use 'price' as the key and '>' to get prices greater than 20.

5fill in blank

hard

Fill all three blanks to query 'recipe' posts published after January 1, 2023, ordered by date ascending.

Wordpress

<?php
$args = array(
  'post_type' => '[1]',
  'date_query' => array(
    array(
      'after' => '[2]'
    )
  ),
  'orderby' => 'date',
  'order' => '[3]'
);
$query = new WP_Query($args);
?>

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

Arecipe

B2023-01-01

CASC

DDESC

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'DESC' order which sorts newest first instead of oldest.

Using wrong date format or post type.

Set 'post_type' to 'recipe', 'after' date to '2023-01-01', and 'order' to 'ASC' for ascending date order.

Practice

1. What is the main purpose of using post_type in a WP_Query in WordPress?

easy

A. To fetch posts of a specific custom post type

B. To change the theme of the website

C. To update the WordPress core version

D. To delete all posts from the database

Solution

1. Step 1: Understand WP_Query parameters

   The post_type parameter in WP_Query specifies which type of posts to fetch, such as posts, pages, or custom types.

2. Step 2: Identify the purpose of post_type

   It filters the query to only return posts of the given type, allowing you to get custom content.

3. Final Answer:

   To fetch posts of a specific custom post type -> Option A

4. Quick Check:

   post_type filters posts by type = A [OK]

Hint: Remember: post_type selects which content type to get [OK]

Common Mistakes:

• Confusing post_type with theme or plugin settings
• Thinking post_type deletes or updates posts
• Using post_type to change site appearance

2. Which of the following is the correct way to query a custom post type named 'product' using WP_Query?

easy

A. new WP_Query(array('post_type' => 'product'));

B. new WP_Query('post_type' = 'product');

C. WP_Query('post_type' => 'product');

D. new WP_Query(array('posttype' => 'product'));

Solution

1. Step 1: Check WP_Query syntax

   The correct syntax uses new WP_Query(array('post_type' => 'product')) with an associative array and the correct key post_type.

2. Step 2: Identify errors in other options

   new WP_Query('post_type' = 'product'); uses wrong assignment syntax, C misses new keyword, and D misspells post_type.

3. Final Answer:

   new WP_Query(array('post_type' => 'product')); -> Option A

4. Quick Check:

   Correct array syntax with 'post_type' key = B [OK]

Hint: Use new WP_Query with array and 'post_type' key [OK]

Common Mistakes:

• Using '=' instead of '=>' in array
• Omitting 'new' keyword
• Misspelling 'post_type' as 'posttype'

3. Given the following code, what will be the output if there are 3 'event' posts?

 $query = new WP_Query(array('post_type' => 'event'));
 if ($query->have_posts()) {
   while ($query->have_posts()) {
     $query->the_post();
     echo get_the_title() . ', ';
   }
 }
 wp_reset_postdata();

medium

A. Syntax error due to missing semicolons

B. No output because 'event' is not a default post type

C. Only the first event post title printed

D. Titles of all 3 event posts separated by commas

Solution

1. Step 1: Understand WP_Query loop behavior

   The loop runs while have_posts() returns true, iterating over all posts of type 'event'.

2. Step 2: Output titles of all posts

   Inside the loop, get_the_title() prints each post's title followed by a comma, so all 3 titles appear separated by commas.

3. Final Answer:

   Titles of all 3 event posts separated by commas -> Option D

4. Quick Check:

   Loop prints all titles = C [OK]

Hint: Loop with have_posts() prints all matching posts [OK]

Common Mistakes:

• Assuming only default post types work
• Thinking loop prints only one post
• Confusing syntax errors with correct code

4. Identify the error in this custom post type query code:

 $args = array('post_type' => 'book');
 $query = WP_Query($args);
 if ($query->have_posts()) {
   while ($query->have_posts()) {
     $query->the_post();
     the_title();
   }
 }
 wp_reset_postdata();

medium

A. Using the_title() inside the loop is invalid

B. Incorrect post_type name 'book'

C. Missing 'new' keyword before WP_Query instantiation

D. Missing wp_reset_postdata() call

Solution

1. Step 1: Check WP_Query instantiation

   WP_Query must be instantiated with the new keyword. The code misses new before WP_Query($args).

2. Step 2: Verify other parts

   The post_type 'book' is valid if registered, wp_reset_postdata() is present, and the_title() is valid inside the loop.

3. Final Answer:

   Missing 'new' keyword before WP_Query instantiation -> Option C

4. Quick Check:

   WP_Query needs 'new' keyword = D [OK]

Hint: Always use 'new' when creating WP_Query objects [OK]

Common Mistakes:

• Forgetting 'new' keyword
• Assuming post_type names are always wrong
• Thinking wp_reset_postdata() is optional

5. You want to query a custom post type 'movie' but only show posts published in 2023. Which WP_Query argument array correctly achieves this?

hard

A. { 'post_type' => 'movie', 'year' => 2023 }

B. { 'post_type' => 'movie', 'date_query' => array(array('year' => 2023)) }

C. { 'post_type' => 'movie', 'meta_key' => 'year', 'meta_value' => 2023 }

D. { 'post_type' => 'movie', 'post_status' => '2023' }

Solution

1. Step 1: Understand filtering by date in WP_Query

   To filter posts by year, use the date_query parameter with an array specifying the year.

2. Step 2: Evaluate each option

   { 'post_type' => 'movie', 'date_query' => array(array('year' => 2023)) } correctly uses date_query with year 2023. { 'post_type' => 'movie', 'year' => 2023 } uses an invalid 'year' key. { 'post_type' => 'movie', 'meta_key' => 'year', 'meta_value' => 2023 } filters by meta fields, not post date. { 'post_type' => 'movie', 'post_status' => '2023' } misuses post_status.

3. Final Answer:

   { 'post_type' => 'movie', 'date_query' => array(array('year' => 2023)) } -> Option B

4. Quick Check:

   Use date_query for year filtering = A [OK]

Hint: Use date_query array to filter posts by year [OK]

Common Mistakes:

• Using 'year' directly instead of date_query
• Confusing meta_key with post date
• Misusing post_status for date filtering