MetaData type and queries

[kidunot89]

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What does this implement/fix? Explain your changes.

Implements MetaData type and adds a metaData field to the types list below that returns an array of MetaData types.

Example Usage

query ($id: ID!, $key: String, $keysIn: [String], $multiple: Boolean) {
    coupon(id: $id) {
        id
        metaData(key: $key, keysIn: $keysIn, multiple: $multiple) {
            key
            value
        }
    }
}

Arguments

'key'      => array(
	'type'        => 'String',
	'description' => __( 'Retrieve meta by key', 'wp-graphql-woocommerce' ),
),
'keysIn'   => array(
	'type'        => array( 'list_of' => 'String' ),
	'description' => __( 'Retrieve multiple metas by key', 'wp-graphql-woocommerce' ),
),
'multiple' => array(
	'type'        => 'Boolean',
	'description' => __( 'Retrieve meta with matching keys', 'wp-graphql-woocommerce' ),
),

Types with metaData field.

• Coupon
• Customer
• CouponLine
• LineItem
• FeeLine
• Order
• Product
• ProductVariation
• Refund
• ShippingLine
• TaxLine

Type with extraData field. (Same as metaData without multiple argument.)

• CartItem

Does this close any currently open issues?

#121

Any relevant logs, error output, GraphiQL screenshots, etc?

(If it’s long, please paste to https://ghostbin.com/ and insert the link here.)

Any other comments?

…

Where has this been tested?

Operating System: Ubuntu 18.04

WordPress Version: 5.2