Pagination showing same posts from page 1 on all other pages - php

Question

I've recently had a lot of help creating an upcoming events list (see here Showing upcoming events (including todays event)?), as a result my pagination using WP Pagenavi is broken.
At the moment, when you click on page 2 it just shows the same posts as page one. Although the URL does actually change to page/2 page/3 etc.
I have this in my functions.php file:
function filter_where( $where = '' ) {
$where .= " AND post_date >= '" . date("Y-m-d") . "'";
return $where;
}
add_filter( 'posts_where', 'filter_where' );
$query = new WP_Query(
array(
'post__not_in' => array(4269),
'paged' => get_query_var('paged'),
'post_type' => 'whatson',
'exclude' => '4269',
'post_status' => 'future,publish',
'posts_per_page' => 20,
'order' => 'ASC'
)
);
remove_filter( 'posts_where', 'filter_where' );
My loop is then as follows:
<?php while ( $query->have_posts() ) : $query->the_post(); ?>
// content
<?php endwhile; // end of the loop. ?>
<?php if (function_exists('wp_pagenavi')) { wp_pagenavi( array( 'query' => $query ) ); } ?>

Answer 1

Finally solved this with:
function my_filter_where( $where = '' ) {
global $wp_query;
if (is_array($wp_query->query_vars['post_status'])) {
if (in_array('future',$wp_query->query_vars['post_status'])) {
// posts today into the future
$where .= " AND post_date > '" . date('Y-m-d', strtotime('now')) . "'";
}
}
return $where;
}
add_filter( 'posts_where', 'my_filter_where' );
And:
<?php
$wp_query = array(
'post__not_in' => array(4269),
'paged' => get_query_var('paged'),
'post_type' => 'whatson',
'exclude' => '4269',
'posts_per_page' => 20,
'order' => 'ASC',
'orderby' => 'date',
'post_status' =>array('future','published'));
query_posts($wp_query);
?>
<?php
if ($wp_query->have_posts()) {
while ( $wp_query->have_posts() ) : $wp_query->the_post(); ?>
Content
<?php endwhile; // end of the loop.
} ?>
<?php if (function_exists('wp_pagenavi')) { wp_pagenavi( array( 'query' => $wp_query ) ); } ?>

Answer 2

Do you want it for specific post or for all of them ? If you want general pagination you can make pagination links without plugins with this piece of code :
<?php
global $wp_query;
$big = 999999999; // need an unlikely integer
echo paginate_links( array(
'base' => str_replace( $big, '%#%', get_pagenum_link( $big ) ),
'format' => '?paged=%#%',
'current' => max( 1, get_query_var('paged') ),
'total' => $wp_query->max_num_pages
) );
?>
Just add it to your index.php or archives.php and see the magic happens :)

Answer 3

I am not sure what is going on with the rest of your code, but one thing to try that would be a simple test would be to use wp_reset_query() before your new WP_Query just to make sure that the query variables have not been modified.