How do I create a GraphQL appSubscriptionCreate mutation with the Ruby shopify_api gem? - ruby-on-rails

Question

When I copy the example below from https://help.shopify.com/en/api/guides/billing-api/implement-your-business-model#implement-the-appsu...:
appSubscriptionCreate(
name: "Super Duper Recurring Plan"
returnUrl: "http://super-duper.shopifyapps.com"
lineItems: [{
plan: {
appRecurringPricingDetails: {
price: { amount: 10.00, currencyCode: USD }
}
}
}]
) {
userErrors {
field
message
}
confirmationUrl
appSubscription {
id
}
}
}
and run it via the "Shopify GraphiQL App", the mutation is successfully created.
I am not sure how to do it with Ruby and the shopify_api gem though (note that I am new to Ruby as well as GraphQL, so it's probably something very basic I am missing, but I have not been able to find the answer anywhere).
I attempted the following:
##client = ShopifyAPI::GraphQL.new
PAYMENT_MUTATION = ##client.parse <<-'GRAPHQL'
{
mutation {
appSubscriptionCreate(
name: "Super Duper Recurring Plan"
returnUrl: "http://super-duper.shopifyapps.com"
lineItems: [{
plan: {
appRecurringPricingDetails: {
price: {
amount: 10.00,
currencyCode: USD
}
}
}
}]
) {
userErrors {
field
message
}
confirmationUrl
appSubscription {
id
}
}
}
}
GRAPHQL
def initialize
#result = ##client.query(PAYMENT_MUTATION)
end
def confirmationUrl
#result.data.appSubscriptionCreate.confirmationUrl
end
end
I get the following error though:
GraphQL::Client::ValidationError (Field 'mutation' doesn't exist on type 'QueryRoot'):
I tried skipping the mutation part, but then I just get the error:
GraphQL::Client::ValidationError (Field 'appSubscriptionCreate' doesn't exist on type 'QueryRoot'):
This led me to have a look at the GraphQL class of the shopify_api gem, hoping to find a "mutation" method to use instead of the "query" method, but there is none.
I cannot figure it out from the graphql-client gem that shopify_api is using either - there's no mutation examples in the readme.
What am I missing?
Thanks,
-Louise

Answer 1

Got the answer on the Shopify forum - I just have to remove the outer {} in PAYMENT_MUTATION.
PAYMENT_MUTATION = ##client.parse <<-'GRAPHQL'
mutation {
appSubscriptionCreate(
name: "Super Duper Recurring Plan"
returnUrl: "http://super-duper.shopifyapps.com"
lineItems: [{
plan: {
appRecurringPricingDetails: {
price: {
amount: 10.00,
currencyCode: USD
}
}
}
}]
) {
userErrors {
field
message
}
confirmationUrl
appSubscription {
id
}
}
}
GRAPHQL