I'm trying to interface with shopify storefront api in golang. But this is my first encounter with graphql and I'm a bit confused.
I need to pass variables for the request and did some research where I came to the conclusion that I could pass variables like shown below. But shopify keeps returning this error:
{"errors":[{"message":"Parse error on \"variables\" (IDENTIFIER) at [13, 3]","locations":[{"line":13,"column":3}]}]}
Here is my current code:
body := strings.NewReader(fmt.Sprintf(`
mutation ($checkoutId: ID!, $lineItems: [CheckoutLineItemInput!]!) {
checkoutLineItemsAdd(checkoutId: $checkoutId, lineItems: $lineItems) {
userErrors {
message
field
}
checkout {
id
}
}
}
variables: { "lineItems": [ { "quantity": 1, "variantId": "%s" } ], "checkoutId": "%s" }
`, productID, checkoutID))
req, err := http.NewRequest("POST", "https://myshop.myshopify.com/api/graphql", body)
if err != nil {
// handle err
fmt.Println(err)
}
req.Header.Set("Content-Type", "application/graphql")
req.Header.Set("X-Shopify-Storefront-Access-Token", "mytoken")
resp, err := http.DefaultClient.Do(req)
if err != nil {
// handle err
fmt.Println(err)
}
defer resp.Body.Close()
data, err := ioutil.ReadAll(resp.Body)
if err != nil {
// handle err
fmt.Println(err)
}
My question is, what is the correct way of passing variables when using application/graphql?
After updating the code with the answer of @DanielRearden I'm now getting this error:
{"errors":[{"message":"Variable checkoutId of type ID! was provided invalid value","locations":[{"line":1,"column":11}],"extensions":{"value":null,"problems":[{"path":[],"explanation":"Expected value to not be null"}]}},{"message":"Variable lineItems of type [CheckoutLineItemInput!]! was provided invalid value","locations":[{"line":1,"column":29}],"extensions":{"value":null,"problems":[{"path":[],"explanation":"Expected value to not be null"}]}}]}
Updated code:
body := strings.NewReader(fmt.Sprintf(`{
"query": "mutation ($checkoutId: ID!, $lineItems: [CheckoutLineItemInput!]!) { checkoutLineItemsAdd(checkoutId: $checkoutId, lineItems: $lineItems) { userErrors { message field } checkout { id } }}",
"variables": {
"$lineItems": [
{ "quantity": 1, "variantId": "%s" }
],
"$checkoutId": "%s"
}
}`, productID, checkoutID))
...
...
req.Header.Set("Content-Type", "application/json")
Removing the $ token on the variables as shown below returns another error:
{
"query": "mutation ($checkoutId: ID!, $lineItems: [CheckoutLineItemInput!]!) { checkoutLineItemsAdd(checkoutId: $checkoutId, lineItems: $lineItems) { userErrors { message field } checkout { id } }}",
"variables": {
"checkoutId": "%s",
"lineItems": [
{ "quantity": 1, "variantId": "%s" }
]
}
}
And the error is: (status 500)
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<meta name="referrer" content="never" />
<title>Something went wrong</title>
But I guess this is not a graphql issue anymore but more of a shopify api problem.
