Creating post with category doesn't work

I replied to another recent post about this same issue. It seems that creating or editing Tag and Categories isn’t working properly. Every format of passing the arguments seems always result in the same error in the response:

<b>Warning</b>:  array_map(): Argument #2 should be an array in <b>/sitename/wp-content/plugins/rest-api/lib/endpoints/class-wp-rest-posts-controller.php</b> on line <b>918</b><br />

Hoping for a fix or any info soon as creating a post without a category is going to be an issue for most I would assume. I know the team is slammed I’m sure working towards their integration into WP, but hopefully we can find out how to fix or get around this.

I’m not able to reproduce the issue in my testing.

@shembelcut Can you share the full request you’re making?

Every format of passing the arguments seems always result in the same error in the response:

@ardend Can you share the request you’re making? categories is meant to be passed as an array — if you don’t pass the argument as an array, you’ll get that PHP error.

Hi Daniel,

Here is the code I am using to send the request, which looks right but the param for categories seem to get messed up when sent as you’ll see below:

$scope.formData.categories = [3, 8];

			$http({
				method: 'POST',
				url: ($scope.api + 'wp/v2/posts/32'),
				params: $scope.formData,
				headers: { 'Content-Type': 'application/json', 'X-WP-Nonce': RestAPI.nonce }
			})
			.success(function (result) {
				console.log('Success!');
			}).error(function () {
				console.log('Fail!');
			});

And here is what happens with the request when i pass it like that:

https://sitename/wp-json/wp/v2/posts/32?categories=3&categories=8

This simply removes any categories in wordpress associated with the post.

When i try and pass it like this: $scope.formData.categories = “[3, 8]”;

The request looks like this:

https://sitename/wp-json/wp/v2/posts/32?categories=%5B3,+8%5D

The request looks right, but all this does is set the post to uncategorized. Any help would be great thanks!

In both cases, your request is passing categories as a string, which means it’s not being interpreted correctly.

Here’s how you would pass the first as array data:

https://sitename/wp-json/wp/v2/posts/32?categories[]=3&categories[]=8

Note the square brackets.

Here’s how you’d pass the second as array data:

$scope.formData.categories = [3, 8];

Note I’ve removed the double quotes.

Actually in the first line of code i set the value to an array like you mentioned for the second example, only when its actually sent it splits it up like you see (32?categories=3&categories=8). Is it the headers maybe?

If it helps, formData is initialized as an empty json to start:

$scope.formData = {};

I feel like there is some specific combination of how to format the param and how to pass it that I am missing.

Ok got this sorted out. For anyone else using Angular, apparently Angular’s HTTP post serializes data in a way that php won’t normally parse correctly, so you have to modify the headers in Angular. I found this on stackoverflow:

https://stackoverflow.com/questions/12190166/angularjs-any-way-for-http-post-to-send-request-parameters-instead-of-json

Check out the answer from Thomas Graziani, about 4 or so down the page. Besides the transform part added to the app.js file, changing the data part of the request code from “params” to “data” made it work. Hope this helps!

Just the other day i came with the same error array_map(): Argument #2 should be an array.For some reasons my posted categories are still in json format and so php can’t parse them.
Note: I’m working with a c# client app, so it’s out of context. I did some modification in /lib/endpoints/class-wp-rest-posts-controller.php Line No around 938 the function handle_terms as:


protected function handle_terms( $post_id, $request ) {
$taxonomies = wp_list_filter( get_object_taxonomies( $this->post_type, 'objects' ), array( 'show_in_rest' => true ) );
foreach ( $taxonomies as $taxonomy ) {
$base = ! empty( $taxonomy->rest_base ) ? $taxonomy->rest_base : $taxonomy->name;

if ( ! isset( $request[ $base ] ) ) {
continue;
}
$arr = $request[ $base ];
if (!is_array($arr)) {
$arr = json_decode($request[ $base ]);
}
$terms = array_map( 'absint', $arr);
$result = wp_set_object_terms( $post_id, $terms, $taxonomy->name );
if ( is_wp_error( $result ) ) {
return $result;
}
}
}

* Just json decoding the $result[base] if not it’s an php array.*