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I have basic knowledge about GraphQL. Now, I would like to convert my knowledge into action. For that, I want to know about few things like how can I add my custom field to any GraphQL Query and mutations. I have also read some blog posts for this but they don't have proper guidance which I am looking for.

Can someone please explain with example of extending an existing GraphQL API for both Query and Mutations? That would be really handy.

Thanks in advance!

  • Do you expecting existing queries & mutation extend or creating custom queries and Mutation? – Mujahidh May 18 at 8:04
  • @Mujahidh, I am expecting to extend/override existing (default magento) queries and mutations. – Pratik Navapara May 18 at 9:35
  • Did you check my answer for your question? – Mujahidh May 22 at 4:51
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    @Mujahidh, Sorry for late response. I was busy with other stuff. I checked your detailed response. It looks fine and I think it will help me as well. I upvoted your reply. Cheers! – Pratik Navapara Jun 19 at 13:12
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One of the possible ways of extending existing GraphQl is using the GraphQl interface. As for example, you have a new product attribute barcode now you want it in GraphQl response. In that case in your custom module's etc > schema.graphqls file add as following

interface ProductInterface {
  barcode: String @resolver (class: "Vendor\\Module\\Model\\Resolver\\ProductCustomAttribute")
}

After implementation flush the cache. You will be get your desire result.

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  • Thanks for your reply. It is useful for interface. What about query and mutations? How can I add new fields in those type of api calls? – Pratik Navapara May 6 at 7:57
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We can do our custom endpoints too. I have extend some existing default graphql queries.

1 . Query storeConfig -( module-store-graph-ql )

2 . Query products's ProductFilterInput - ( module-catalog-graph-ql )

1 . Query storeConfig -( module-store-graph-ql )

I extended storeConfig using following steps. create a di.xml file under module's etc/graphql directory and define the new items like below.

<?xml version="1.0" ?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
<type name="Magento\StoreGraphQl\Model\Resolver\Store\StoreConfigDataProvider">
    <arguments>
        <argument name="extendedConfigData">
<!-- Default store config sets-->
    <item name="general_store_information_name" xsi:type="string">general/store_information/name</item>
    <item name="general_store_information_additional_phone" xsi:type="string">general/store_information/additional_phone</item>
    <!-- Custom store config sets-->
    <item name="contact_us_forms_title" xsi:type="string">contact_us/forms/title</item>
    <item name="contact_us_forms_info_title" xsi:type="string">contact_us/forms/info_title</item>
    </argument>
    </arguments>
</type>
</config>

and write the schema.graphqls file

type StoreConfig {
general_store_information_name : String  @doc(description: "Store Name"),
general_store_information_phone : String  @doc(description: "Store Phone Number "),
contact_us_forms_title : String  @doc(description: "contact Us form title text"),
contact_us_forms_info_title : String  @doc(description: "contact Us information section title text")
}

After setup:upgrade and chache:clean you can run the graphql query like below to get the result.

query{
storeConfig {
    copyright
    general_store_information_name
    trans_email_ident_general_email
    contact_us_forms_title
    contact_us_forms_info_title
}
}

For better understanding read How to get the store configuration values using GraphQl in magento 2?

2 . Query products's ProductFilterInput - ( module-catalog-graph-ql ) for this section please read magento 2 graphql product query

All these customization i did based on my requirements with personally modification. It's worked out for me. Hope this will help you and some one who read this.

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