wpgraphql custom connection is returning null json - php

Question

I was trying to fetch data from the wordpress custom tabel however the json in wpgraphql is return nothing
`
{
"data": {
"customers": {
"nodes": []
}
},
"extensions": {
"debug": [],
"tracing": {
"version": 1,
"startTime": 1674985374.163901,
"endTime": 1674985374.182393,
"duration": 18491,
"execution": {
"resolvers": [
{
"path": [
"customers"
],
"parentType": "RootQuery",
"fieldName": "customers",
"returnType": "RootQueryToCustomerConnection",
"startOffset": 15638,
"duration": 1742
},
{
"path": [
"customers",
"nodes"
],
"parentType": "RootQueryToCustomerConnection",
"fieldName": "nodes",
"returnType": "[Customer!]!",
"startOffset": 17647,
"duration": 7
}
]
}
},
"queryLog": [
"Query Logging has been disabled. The 'SAVEQUERIES' Constant is set to 'false' on your server."
],
"queryAnalyzer": {
"keys": "b8e3177963ec0ae1ea1edc35f5d818248bb0e460feecb0ac25cdaff638cd545e graphql:Query operation:NewQuery list:customer",
"keysLength": 111,
"keysCount": 4,
"skippedKeys": "",
"skippedKeysSize": 0,
"skippedKeysCount": 0,
"skippedTypes": []
}
}
}`
My Code is this
`
register_activation_hook( __FILE__, 'wpgraphql_customer_db_table');
/**
* When the plugin is activated, create the table
* if it doesn't already exist
*/
function wpgraphql_customer_db_table() {
global $table_prefix, $wpdb;
$table_name = 'customers';
$wp_table = $wpdb->prefix . $table_name;
$charset_collate = $wpdb->get_charset_collate();
/**
* If the table doesn't already exist
*/
if ( $wpdb->get_var( "show tables like '$wp_table") != $wp_table ) {
require_once( ABSPATH . 'wp-admin/includes/upgrade.php' );
$sql = "
CREATE TABLE $wp_table (
`id` int(11) NOT NULL AUTO_INCREMENT,
`first_name` varchar(100) NOT NULL,
`last_name` varchar(100) NOT NULL,
`email` varchar(100) NOT NULL,
`password` varchar(225) NOT NULL,
PRIMARY KEY (`id`)
) $charset_collate;
";
dbDelta( $sql );
}
}
/**
* Hook into graphql init to extend GraphQL functionality
*/
add_action( 'graphql_init', function() {
class CustomerConnectionResolver extends \WPGraphQL\Data\Connection\AbstractConnectionResolver {
public function get_loader_name() {
return 'customers';
}
public function get_query_args() {
return [];
}
public function get_query() {
global $wpdb;
$ids_array = $wpdb->get_results(
$wpdb->prepare(
'SELECT id FROM `".$wpdb->prefix."customers` WHERE 1'
)
);
$ids = ! empty( $ids_array ) ? array_values(array_column($ids_array, 'id')) : [];
return $ids;
// wp_send_json($ids);
// print_r($ids);
// die();
}
public function get_ids() {
return $this->get_query();
}
public function is_valid_offset( $offset ) {
return true;
}
// public function is_valid_model( $model ) {
// return true;
// }
public function should_execute() {
return true;
}
}
/**
* Class NotificationsLoader
*
* This is a custom loader that extends the WPGraphQL Abstract Data Loader.
*/
class CustomersLoader extends \WPGraphQL\Data\Loader\AbstractDataLoader {
public function loadKeys( array $keys ) {
if ( empty( $keys ) || ! is_array( $keys ) ) {
return [];
}
global $wpdb;
$results = $wpdb->get_results(
$wpdb->prepare(
"SELECT * FROM `".$wpdb->prefix."customers` WHERE `id` in (".implode(',',$keys).")"
)
);
$results_by_id = [];
foreach ( $results as $result ) {
$customer = [
// 'DatabaseId' => $result->id,
'firstName' => $result->first_name,
'lastName' => $result->last_name,
// 'email' => $result->email,
// 'password' => $result->password,
];
$results_by_id[ (int) $result->id ] = $customer;
}
echo $results_by_id;
$customers = [];
foreach ( $keys as $key ) {
if ( isset( $results_by_id[ $key ] ) ) {
$customers[$key] = $results_by_id[ $key ];
}
}
// graphql_debug($customers);
return $customers;
}
}
add_filter( 'graphql_data_loaders', function( $loaders, $context ) {
$loaders['customers'] = new CustomersLoader( $context );
return $loaders;
}, 10, 2 );
} );
/**
* Hook into GraphQL Schema initialization to register types
* and fields to the Schema
*/
add_action( 'graphql_register_types', function() {
# 1: Register the Type
register_graphql_object_type( 'Customer', [
'description' => __( 'Customer Records from Custom Table', 'wp-graphql-customers' ),
'fields' => [
// 'DatabaseId' => [
// 'type' => [ 'non_null' => 'Int' ],
// 'description' => __( 'Identifier of the customers database record id', 'wp-graphql-customers' ),
// ],
'firstName' => [
'type' => 'String',
'description' => __( 'First Name of the Customer', 'wp-graphql-customers' )
],
'lastName' => [
'type' => 'String',
'description' => __( 'Last Name of the Customer', 'wp-graphql-customers' )
],
// 'email' => [
// 'type' => 'String',
// 'description' => __( 'Email of the Customer', 'wp-graphql-customers' )
// ],
// 'password' => [
// 'type' => 'String',
// 'description' => __( 'Password of customers', 'wp-graphql-customers' )
// ],
],
'interfaces' => [ 'Node' ],
] );
# 2: Register the connection
register_graphql_connection( [
'fromType' => 'RootQuery',
'toType' => 'Customer' ,
'fromFieldName' => 'customers',
'resolve' => function( $source, $args, $context, $info ) {
$resolver = new CustomerConnectionResolver( $source, $args, $context, $info );
return $resolver->get_connection();
},
]);
} );
What I am doing wrong please help.
I would like to return data something like
{
"data": {
"posts": {
"edges": [
{
"node": {
"firstName": "shank",
"lastName": "Nath"
}
}
]
}
}

Answer 1

The SQL query to fetch data from the customers table is missing a quotation mark at the end:
$wpdb->get_var( "show tables like '$wp_table") != $wp_table
It should be:
$wpdb->get_var( "show tables like '$wp_table'") != $wp_table