Iterate through an array and check if text exists in sub object in rust - rust

Question

I am new to rust and got stuck in getting the below data. Using rust for Shopify payment customisation extension.
Reference code from https://shopify.dev/docs/apps/checkout/payment-customizations/getting-started
This is my input for running cargo test
r#"
{
"cart": {
"deliveryGroups": [{
"selectedDeliveryOption": {
"title": "Test"
}
}]
},
"paymentMethods": [{
"id": "1",
"name": "Test"
}],
"paymentCustomization": {
"metafield": {
"value": "{\"paymentMethod\": \"Test\", \"shippingMethod\": \"Test\"}"
}
}
}
"#
I need to check if the cart.deliveryGroups.iter().selectedDeliveryOption.title == 'Test'. If yes, return true else false.
This is the is code i am using to check. using Shopify #[shopify_function] to convert the data to input field with object data.
let is_available = input
.cart
.delivery_groups
.iter()
.find(|&method| {
method
.selected_delivery_option
.unwrap()
.title
.contains('Test')
})
.map(|method| {
true
});
Is the above code to get find the title using iter method correct or there is another way to do this ?
Tried to get the data using the above code, but always getting error.
Current error is
error[E0658]: use of unstable library feature 'option_result_contains'
--> src/main.rs:48:18
|
48 | .contains('Test')
| ^^^^^^^^
|
= note: see issue #62358 <https://github.com/rust-lang/rust/issues/62358> for more information
test.rs https://codeshare.io/xvQKKk
main.rs https://codeshare.io/X8Jbbo
// Filter the shipping method to disable
let shipping_method = input
.cart
.delivery_groups
.iter()
.find(|&method| {
println!("Selected delivery option {:?}", method.selected_delivery_option);
true
});
println!("shippping method {:?}", shipping_method);
The above code give output as
Selected delivery option Some(InputCartDeliveryGroupsSelectedDeliveryOption { title: Some("Another delivery method") })
shippping method Some(InputCartDeliveryGroups { selected_delivery_option: Some(InputCartDeliveryGroupsSelectedDeliveryOption { title: Some("Another delivery method") }) })