sinatra - Ruby function to get Firestore doc field

Question

I am trying to make a Stripe payment endpoint and want to calculate the cost on the server. I have documents in Firebase Firestore and the document has a parameter called productPrice. The documents are using an id called imageId. How do I create a function which takes in the imageId and output the productPrice?

def calculate_order_amount(imageId)
  # Get a collection reference
    images_col = firestore.col "ImagesCollection"

  # Get a document reference
    doc_ref = images_col.doc "#{imageId}"

    puts doc_ref.productPrice 

end

I don't think this is the correct way to do it as it just returns 500 server error. There are way too many documentation for this use case and all are very different.

Answer 1

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