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I am using a customised archive template for a custom post type.

At the top of the page, I'd like to show a specific post, found using a new wp_query() call.

$args = [
    'posts_per_page' => 1,
    'post_type' => 'document',
    'order' => 'DESC',
    'orderby' => 'date',
];
$query = new WP_Query( $args );
if ( $query->have_posts() ) {
    while ( $query->have_posts() ) {
        $query->the_post();
        the_title();
        the_date( 'F Y' );
    }
    wp_reset_postdata();
}

Custom search form

<form id="document-filter" method="post">
    <select name="order_by">
        <option value="date">Date</option>
        <option value="title">Name</option>
    </select>
    <select name="order">
        <option value="desc">DESC</option>
        <option value="asc">ASC</option>
    </select>
    <input name="s" type="text" placeholder="Filter by keyword" value=""/>
    <input name="post_type" type="hidden" value="document"/>
    <input type="submit" />
</form>

Initially, it works. However, if I then use the custom search form to either sort the archive list (date/name, asc/desc), the custom wp_query() is affected, and the query_vars array is overriding my supplied arguments.

I am using a customised archive template for a custom post type.

At the top of the page, I'd like to show a specific post, found using a new wp_query() call.

$args = [
    'posts_per_page' => 1,
    'post_type' => 'document',
    'order' => 'DESC',
    'orderby' => 'date',
];
$query = new WP_Query( $args );
if ( $query->have_posts() ) {
    while ( $query->have_posts() ) {
        $query->the_post();
        the_title();
        the_date( 'F Y' );
    }
    wp_reset_postdata();
}

Custom search form

<form id="document-filter" method="post">
    <select name="order_by">
        <option value="date">Date</option>
        <option value="title">Name</option>
    </select>
    <select name="order">
        <option value="desc">DESC</option>
        <option value="asc">ASC</option>
    </select>
    <input name="s" type="text" placeholder="Filter by keyword" value=""/>
    <input name="post_type" type="hidden" value="document"/>
    <input type="submit" />
</form>

Initially, it works. However, if I then use the custom search form to either sort the archive list (date/name, asc/desc), the custom wp_query() is affected, and the query_vars array is overriding my supplied arguments.

Example

Posts, in date order, descending:

1. Post C
2. Post B
3. Post A

Initially, my custom query at the top of the page will output Post C, which is correct.

If I use the search/filter form to change the order of the posts to:

1. Post A
2. Post B
3. Post C

The singular queried post will now be Post A, which is incorrect. My custom query args have not changed, but are being overridden by the search form somehow.

I am using a customised archive template for a custom post type.

At the top of the page, I'd like to show a specific post, found using a new wp_query() call.

$args = [
    'posts_per_page' => 1,
    'post_type' => 'document',
    'order' => 'DESC',
    'orderby' => 'date',
];
$query = new WP_Query( $args );
if ( $query->have_posts() ) {
    while ( $query->have_posts() ) {
        $query->the_post();
        echo the_title();
        echo the_date( 'F Y' );
    }
    wp_reset_postdata();
}

Initially, it works. However, if I then use the custom search form to either sort the archive list (date/name, asc/desc), the custom wp_query() is affected, and the query_vars array is overriding my supplied arguments.

I am using a customised archive template for a custom post type.

At the top of the page, I'd like to show a specific post, found using a new wp_query() call.

$args = [
    'posts_per_page' => 1,
    'post_type' => 'document',
    'order' => 'DESC',
    'orderby' => 'date',
];
$query = new WP_Query( $args );
if ( $query->have_posts() ) {
    while ( $query->have_posts() ) {
        $query->the_post();
        the_title();
        the_date( 'F Y' );
    }
    wp_reset_postdata();
}

Custom search form

<form id="document-filter" method="post">
    <select name="order_by">
        <option value="date">Date</option>
        <option value="title">Name</option>
    </select>
    <select name="order">
        <option value="desc">DESC</option>
        <option value="asc">ASC</option>
    </select>
    <input name="s" type="text" placeholder="Filter by keyword" value=""/>
    <input name="post_type" type="hidden" value="document"/>
    <input type="submit" />
</form>

Initially, it works. However, if I then use the custom search form to either sort the archive list (date/name, asc/desc), the custom wp_query() is affected, and the query_vars array is overriding my supplied arguments.

I am using a customised archive template for a custom post type.

At the top of the page, I'd like to show a specific post, found using a new wp_query() call.

$args = [
    'posts_per_page' => 1,
    'post_type' => 'document',
    'order' => 'DESC',
    'orderby' => 'date',
];
$query = new WP_Query( $args );
if ( $query->have_posts() ) {
    while ( $query->have_posts() ) {
        $query->the_post();
        echo the_title();
        echo the_date( 'F Y' );
    }
    wp_reset_postdata();
}

Initially, it works. However, if I then use the custom search form to either sort the archive list (date/name, asc/desc) or search for a keyboard, the custom wp_query() is affected, and the query_vars array is overriding my supplied arguments.

I am using a customised archive template for a custom post type.

At the top of the page, I'd like to show a specific post, found using a new wp_query() call.

$args = [
    'posts_per_page' => 1,
    'post_type' => 'document',
    'order' => 'DESC',
    'orderby' => 'date',
];
$query = new WP_Query( $args );
if ( $query->have_posts() ) {
    while ( $query->have_posts() ) {
        $query->the_post();
        echo the_title();
        echo the_date( 'F Y' );
    }
    wp_reset_postdata();
}

Initially, it works. However, if I then use the custom search form to either sort the archive list (date/name, asc/desc), the custom wp_query() is affected, and the query_vars array is overriding my supplied arguments.