How to modify the current query with pre _ get _ posts?

Here is a small example using is_main_query and pre_get_posts: This code is simply taking off posts from category ID 5 from the main query. But you can go further, you can for example query only posts from a specific type and with a custom meta field key equal to a determined value.

What does pre get posts do in WordPress?

In WordPress, pre_get_posts is an action that makes it possible to modify an existing WP_Query, before that query is actually run. pre_get_posts offers some solutions that are more performant than writing a custom WP_Query, and enables solutions to other problems that would be quite difficult otherwise.

How does pre _ get _ posts work in Codex?

Here’s an info about “pre_get_posts” in the codex: The pre_get_posts action gives developers access to the $query object by reference (any changes you make to $query are made directly to the original object – no return value is necessary). That’s important to note that the $query object passed to your function is passed by reference.

When to use WP _ reset _ query ( ) function?

Destroys the previous query and sets up a new query. This should be used after query_posts () and before another query_posts (). This will remove obscure bugs that occur when the previous WP_Query object is not destroyed properly before another is set up.

When to use get _ queried _ object ( ) in WordPress?

– On an author archive page, it will return the WP_User object of that author. – On any singular page (a single post, a single page, or a post in a custom post type), it will return the WP_Post object of that post or page. Be careful not to use get_queried_object () and get_post () or global $post interchangeably.

When to use pre get posts in WordPress?

Unless you are intimately familiar with these settings and are willing to coordinate them yourself, it’s suggested that you replace the main query by using WP_Query in the page.php or single.php (child) theme template files. pre_get_posts runs before WP_Query has been set up.

Which is better get posts or query posts?

Each have parameters that reflect this difference in implementation. query_posts also uses WP_Query, but is not recommended because it directly alters the main loop by changing the variables of the global variable $wp_query. get_posts, on the other hand, simply references a new WP_Query object, and therefore does not affect or alter the main loop.

Can you use the offset argument in a WordPress query?

Using the offset argument in any WordPress query can break pagination. If you need to use offset and preserve pagination, please keep in mind that you will need to handle pagination manually.

How does have _ posts in WP query work?

The function have_posts iterates the global $wp_query object that is not related only to the main query. global $wp_query; may be altered with the secondary queries also. This is essentially a wrapper for a separate instance of a WP_Query object.

Just to outline some improvements to the accepted answer since WordPress evolved over the time and some things are different now (five years later): pre_get_posts is a filter, for altering any query. It is most often used to alter only the ‘main query’: Actually is an action hook.

How does query _ posts ( ) change the main loop?

query_posts() is meant for altering the main loop. It does so by replacing the query used to generate the main loop content. Once you use query_posts(), your post-related global variables and template tags will be altered.

Why do I need a date range in rest?

But you would probably want to have support for if they only provide one query parameter. So if they only provided “start” then it would get all bids after that date, or if they only provided “end” it would get all bids before that date. The reasoning being that query parameters are good for GETting a subset of results from a GET request.

What is the proper way to format a REST URL with a date range?

I’m leaning towards the 1st date range URL as start and end are not entities in the domain. What is the proper way to format a REST URL with a date range?

Which is a custom query for a portfolio page?

In the code below, we are targeting only custom post type called “portfolio” where meta key “project_type” is set to “design”, that’s a typical query that can be used on a portfolio page: That’s not all, you can for example define a posts per page number:

What’s the best way to query a post in WordPress?

For general post queries, use WP_Query or get_posts(). It is strongly recommended that you use the ‘pre_get_posts’ action instead, and alter the main query by checking is_main_query().

Which is the main query in WordPress hook?

For example, its recommended to use the the is_admin () conditional to not change queries in the admin screens. With the $query->is_main_query () conditional from the query object you can target the main query of a page request. The main query is used by the primary post loop that displays the main content for a post, page or archive.

When to use WP _ get _ post _ categories ( )?

The results from wp_get_post_categories () aren’t cached which will result in a database call being made every time this function is called. Use this function with care. For performance, functions like get_the_category () should be used to return categories attached to a post.

How to get category ID of current post?

When you use get_the_category () function to get category’s data, it return the array of object so you have to access category id by passing array key, like this $postcat [0]->term_id Hope this help! Old post I know, but wp_get_post_categories is likely what you want.

How does pre get posts work in WordPress?

While using pre_get_posts hook, $query object is passed by reference, this means any changes we make to the object inside the function are made directly to the original object. In this way, you don’t need to declare globals variables or return a value.

When to call pre get posts in WordPress?

This ‘pre_get_posts’ hook is called after the query variable object is created, but before the actual query is run. query_posts () is meant for altering the main loop.

When to use offset argument in WordPress hook?

In such cases, you will need to work directly with the query vars, which are passed to the pre_get_posts hook as an argument ( $query in examples on this page). Using the offset argument in any WordPress query can break pagination.

How to alter the main query in WordPress?

This is the easiest and recommended way to alter the main query. This ‘pre_get_posts’ hook is called after the query variable object is created, but before the actual query is run. query_posts () is meant for altering the main loop.

When do you need to edit data in a query?

You can always edit the data in a query when the query is based on either only one table or on two tables that bear a one-to-one relationship to each other. Note: Even when you can edit data in a query, some of its fields may not be available for editing. Such cases are listed in the following section.

How to update the table name in PostgreSQL?

The following illustrates the syntax of the UPDATE statement: UPDATE table_name SET column1 = value1, column2 = value2, WHERE condition; First, specify the name of the table that you want to update data after the UPDATE keyword. Second, specify columns and their new values after SET keyword.

How to query multiple custom post types with query _ posts?

A very common WordPress function to modify the posts that are fetched on a page is called query_posts (). There are two ways to pass parameters to query_posts; you can pass an array or you can use the concatenated version.

How to include custom post types in WordPress search?

By default, custom post types are not included in the search results, so we are going to create a function that allows them to be queried and searched by WordPress. Open up your functions.php file and paste in the following: This function is simply filtering our search results by adding new arguments to the query results.

How to modify the current query with pre _ get _ posts?