php query based on relational child elements for wordpress loop - php

Question

I will try and explain this a simple as possible.
I have 3 post types that come into play here.
reports
events (motogp-2013, motogp-2014)
circuits
On my 'events' single.php to display the event information, I am trying to create a query to display related 'reports'.
And the only relation that the event content can have with a report is the circuit.
When I create a 'report', I have to assign an 'event' to it. But when I create a 'event' prior to a report, I have to assign a 'circuit' to it.
For example, it looks like this...
> 'report' - Second place for Pedrosa as black flag terminates race for Marquez (1023)
> 'event' - Australian Grand Prix (662)
> 'circuit' - Phillip Island (156)
So I am trying to query 'reports', which had 'events' at specific 'circuits'.
On my 'events' single.php, I do have the circuit id, but I don't know how to list the reports that which are at that circuit.
I can easily show related 'events' using this query
$related = new WP_Query(array(
'post_type' => array('motogp-2013','motogp-2014'),
'posts_per_page' => -1,
'meta_query' => array(
array(
'key' => 'event_calendar_circuit',
'value' => $circuit,
'compare' => '=',
'type' => 'NUMERIC'
)
)
));
But this is not what I'm trying to achieve, I need to show related reports.
This reports_race_event meta key contains the id number of the 'event', and the 'event' contains the meta key event_calendar_circuit which contains the circuit id.
My question is how do I do this for 'reports', when the only meta_key I have is reports_race_event
I need to list 'reports' which we're held at a specific $circuit
If any one can help me that would be great thanks.
I've figured out how I can do this!
But I still need help please, I can list all related reports like this...
$related_reports = new WP_Query(array(
'post_type' => 'reports',
'posts_per_page' => -1,
'meta_query' => array(
array(
'key' => 'reports_race_event',
'value' => $events_at_circuit,
'compare' => not sure,
'type' => not sure
)
)
));
But I need to create an array of 'event' id numbers and store it in this $events_at_circuit variable.
Buy using this query first...
global $circuit;
$related_events = get_posts(array(
'post_type' => array('motogp-2013','motogp-2014'),
'posts_per_page' => -1,
'meta_query' => array(
array(
'key' => 'event_calendar_circuit',
'value' => $circuit,
'compare' => '=',
'type' => 'NUMERIC'
)
)
));
My question is now, how do I get the returned post id numbers from the $related_events query and store them as an array in $events_at_circuit

Answer 1

I eventually got there...
Here is the answer, I had to store the array numbers for the events that where at that circuit, then queried by meta_key value using an array variable. Then comparing using wordpress meta IN comparison. See full code below...
$events_at_circuit = null;
$related_events = get_posts(array(
'post_type' => array('motogp-2013','motogp-2014'),
'posts_per_page' => -1,
'meta_query' => array(
array(
'key' => 'event_calendar_circuit',
'value' => $circuit,
'compare' => '=',
'type' => 'NUMERIC'
)
)
));
if( !empty( $related_events ) ){ foreach( $related_events as $related_event ) $events_at_circuit[] = $related_event->ID; }
$related_reports = new WP_Query(array(
'post_type' => 'reports',
'posts_per_page' => -1,
'meta_query' => array(
array(
'key' => 'reports_race_event',
'value' => $events_at_circuit,
'compare' => 'IN',
'type' => 'NUMERIC'
)
)
));
if ( $related_reports->have_posts() ) :