How do I get a list of 'Lesson' IDs from a 'Course' ID

[Elliott Mangham]

Hello,

If I have a ‘Course’ ID, for example, “123”, how can I get a list of ‘Lesson’ IDs associated with that particular course in PHP?

I want to do something like this (FOR EXAMPLE):

$course_id = 123;
$lessons_in_course = get_lessons_as_id( $course_id );

foreach( $lessons_in_course as $lesson ) { ... }

I cannot seem to find where this data is stored/located at all.

Thank you so much!

[Anonymous]

Dear Elliott Mangham,

Please let me know why you need to get a list of ‘Lesson’ IDs from a ‘Course’ ID

Best regards,

Huyen Anh

[Elliott Mangham]

Hi,

Why does it matter why I need to do it? I’m creating a custom theme and need to list each lesson related to a specific course, with PHP. This way, I can also pull in additional data related to each lesson, such as ACF data, for example…

Thanks.

[Anonymous]

Dear Elliott Mangham,

I’m so sorry.

Can you say more clearly about where you want to show a list of ‘Lesson’ IDs from a ‘Course’ ID?

Because with this, you only need go to Course, you’ll see the list of lesson in that course.

Best regards,

Huyen Anh

[Elliott Mangham]

Hi again,

I am creating a CUSTOM THEME and as part of the requirement for this specific project, I need to display a list of lesson data related to a specific course, in a different area of the site, with different code. I understand there’s a pre-built list on a Course page, but this isn’t what I need.

Is there not some sort of function I can utilise, i.e. get_lessons_in_course( $course_id )?

Thanks.

[Anonymous]

Dear Elliott Mangham,

Please try to use this function: learn_press_get_course_curriculum

Best regards,

Huyen Anh

[Elliott Mangham]

Hi,

This appears to have the data I need, but when I attempt to create a loop from the data, I get an error Fatal error: Uncaught Error: Cannot access protected property LP_Course_Section::$items.

The data within the function is protected [items:protected].

Any suggestions? Thanks

[Anonymous]

Dear Elliott Mangham,

With this, you should find a developer they’ll help you write a query to get lesson from database.

Best regards,

Huyen Anh

[Elliott Mangham]

Hi,

What about by listing the lessons using query_posts() and somehow filtering them by course?

There is no documentation on this…

Thanks,

[Anonymous]

Dear Elliott Mangham,

I’m so sorry. We don’t have the documentation about this.

With this, you should find a developer. They will help you.

Or you can research it for yourself.

Thanks!

Best regards,

Huyen Anh

[Elliott Mangham]

I am a developer, but the plugin offers absolutely no technical documentation making the plugin redundant without using a pre-built theme.

Thanks for your time.

[Anonymous]

Dear Elliott Mangham,

I’m so sorry about that but all plugins on WordPress don’t have the documentation about code.

So if you’re a developer, you should research about it for your self. Please try search it.

Hope you understand.

Best regards,

Huyen Anh

[Elliott Mangham]

Hi,

A) Plugins do normally come with technical documentation, as well as accessible hooks to utilise. Especially when there’s a mass of data generated by said plugin, and B) I have searched it – but no documentation specifically for LearnPress.

I will write up a solution myself and share the solution with others for future reference. I was hoping the developers would have put functions in-place already.

Again, I really appreciate your time.

[Anonymous]

Dear Elliott Mangham,

Please try to use this:

$course->get_items( LP_LESSON_CPT );

Best regards,

Huyen Anh

[Elliott Mangham]

Hi,

This fires an error: Fatal error: Uncaught Error: Call to undefined method WP_Post::get_items()

This is definitely the type of thing I was looking for though! (one that works)

Thanks

[Anonymous]

Dear Elliott Mangham,

Note: $course is an object of COURSE

Exp: $course = learn_press_get_course(ID_OF_COURSE)

ID_OF_COURSE is ID of the post with post_type is lp_course

Best regards,

Huyen Anh

[Elliott Mangham]

Oops, it’s because I was using lp_course instead of lp_lesson as the post type, but I’m glad you thought the same!

This works an absolute dream, thank you!

Do you have a list of these helpful functions anywhere to use as a reference point? No doubt, I’ll need to some something similar for other data at some point in the near future :-)

Really appreciate the help +++++

[Anonymous]

Dear Elliott Mangham,

I’m so sorry.

We don’t have the list of these function. But thanks for your feedback, we’ll consider and add it in the documentation.

I hope you were satisfied with our plugin as well as the level of service we provided. If you are happy with the plugin & our services, please consider to rate 5 stars for our plugin here: https://wordpress.org/support/plugin/learnpress/reviews/?rate=5#new-post

You may need to create an account here: https://login.wordpress.org/

I very appreciate your help.

If you need any assistance about our LMS items, please let me know.

Best regards,

Huyen Anh

 

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