[Resolved] Conditional Output – how to determine whether child post has parent post
This thread is resolved. Here is a description of the problem and solution.
Problem:
How to test whether a child post has a parent, using wpv-conditional.
Solution:
With the switch to Types 3 the format of the conditional statement required has changed, and using the GUI to insert fields will ensure the right format is used.
So, insert the field you want to test into the template using the Fields and Views button, using the post selection tab to identify what would be the parent.
Then manually copy and paste this into a wpv-conditional statement, to achieve something like this:
[wpv-conditional if="( '[wpv-post-id item='@relationship-slug.parent']' ne '' )"]
HAS PARENT
[/wpv-conditional]
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Hi. I have been banging my head on this for past couple of days...
I HAVE THE FOLLOWING DATA MODEL...
- parent post type called location
- child post type called session
- location has many sessions (one:many)
- view uses sessions for content selection
I WISH TO DO THE FOLLOWING...
- determine whether a session (child) post has corresponding location (parent) post
----------
1. WHAT I DID...
I tried the following expression to determine whether parent post exists by checking for presence of foreign key.
[wpv-conditional if="( $(_wpcf_belongs_location_id) ne '' )"]
Yes! child has parent post
[/wpv-conditional]
RESULT: Always evaluates FALSE
----------
2. WHAT I DID...
I then tried to determine whether a random field was present in parent post. If TRUE, then parent post must also exist.
[wpv-conditional if="( $(wpcf-location-name).id(location) ne '' )"]
Yes! child field (i.e. location-name) exists
[/wpv-conditional]
One quick note to mention you can add the debug="true" attribute to your wpv-conditional shortcode and then on the front-end it will show you what is being compared which can help track down problems.
In this particular case the right way to do this depends on whether you are using relationships newly created in Types 3, or relationships created in Types 2 that you have not migrated, or have migrated.
This works for newly created relationships and should work for migrated relationships:
[wpv-conditional if="( '[wpv-post-id item='@relationship-slug.parent']' ne '' )"]
HAS PARENT
[/wpv-conditional]
I generated that in two steps. I inserted the wpv-conditional with a test of the wpv-post-id shortcode.
The GUI doesn't let you add parameters, so I inserted the wpv-post-id shortcode directly, using the Post selection tab to specify that I wanted the source to be the relevant parent to get the correct format.
I then replaced the vanilla wpv-post-id in the conditional with this (adjusting quotes as required).
