Different number posts per page based on custom post type term id

Trying to cobble together a function from various suggestions that sets the number of posts per page based on the custom post type category in question. For instance, an “Alphabetical” category contains 3500+ posts, so I want pagination, but a child category “A” contains 100 posts and I want to show them all without pagination. The term_id for “A” is 1858, for “Alphabetical” is 1853. Can I check for specific term ids in a conditional? Not like this of course, which was just guessing…

add_filter('pre_get_posts', 'limit_change_posts_archive');
function limit_change_posts_archive($query){
    if ( is_archive && is_tax( 'pdsh_categories' ) && is_term( 1858 ) {
    $query->set('posts_per_page', -1);
}
return $query;

Answers:

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Method 1

You can achieve it with pre_get_posts. With your current code there are multiple syntax errors. You have write it this way

add_filter('pre_get_posts', 'limit_change_posts_archive');
function limit_change_posts_archive($query){
    if ( !is_admin() && $query->is_main_query() && is_archive() && is_tax( 'pdsh_categories' ) && is_term( 1858 )) {
        $query->set('posts_per_page', -1);
    }
    return $query;
}

As is_term is deprecated a different approach can be like this:

add_filter('pre_get_posts', 'limit_change_posts_archive');
function limit_change_posts_archive($query){
    if ( !is_admin() && $query->is_main_query() && is_archive() && is_tax( 'pdsh_categories', 1858 )) {
        $query->set('posts_per_page', -1);
    }
    return $query;
}

Again this above code needs to be tested.

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