Query posts custom field: check list inside a ACF repeater - mysql

Question

I'm trying to query all posts that have a specific check box selected inside a repeater field.
I found this tutorial and what I want to do is a mix of topic 3 and 4, but I couldn't accomplish by my self, my first attempt was to query all posts and print just one checked item:
<?php
$args = array(
'post_type' => 'modalidade',
'posts_per_page' => -1,
);
$loop = new WP_Query( $args );
?>
<?php
// check if the repeater field has rows of data
if( have_rows('horarios') ):
// loop through the rows of data
while ( have_rows('horarios') ) : the_row();
$dia_da_semana = get_sub_field_object( 'dia_da_semana' );
$horario = get_sub_field_object( 'horario' );
if ( in_array(1, $dia_da_semana['value'])) {
echo 'segunda';
print_r( $horario['value']);
echo '<br>';
}
endwhile;
endif;
?>
But don't think that is a good solution. Maybe there is a better way to achieve what I'm trying to do.

Answer 1

I used the tutorial found here and tweked my code and my data structure a little bit and made it. The final code looks like this:
// filter
function my_posts_where( $where ) {
$where = str_replace("meta_key = 'time_%", "meta_key LIKE 'time_%", $where);
return $where;
}
add_filter('posts_where', 'my_posts_where');
// args
$args = array(
'posts_per_page' => -1,
'post_type' => 'class',
'meta_query' => array(
array(
'key' => 'time_%_day_of_week',
'value' => 'monday',
'compare' => 'LIKE'
),
)
);
One change that was very important to me was to replace the 'numberposts' => -1, to 'posts_per_page' => -1, to get all the posts. The property numberposts wasn't working.