How to query key values from a hash of arrays of hashes

Question

I have a JSONB payload in my database. This payload is from a GraphQL query of the shopify_api.

For the shop_order below, I am trying to query for the name of the fourth order in the node.

shop_order = {"data":{"orders":{"edges":[{"node":{"id":"gid://shopify/Order/2228134674512","name":"#1001","createdAt":"2020-05-01T18:46:04Z","shippingAddress":{"address1":"1234 Long Avenue, 2N","address2":"","city":"Chicago","province":"Illinois","provinceCode":"IL","zip":"55555"}}},{"node":{"id":"gid://shopify/Order/2239643451472","name":"#1002","createdAt":"2020-05-05T14:40:36Z","shippingAddress":{"address1":"1234 Long Avenue","address2":"2N","city":"Chicago","province":"Illinois","provinceCode":"IL","zip":"55555"}}},{"node":{"id":"gid://shopify/Order/2239950323792","name":"#1003","createdAt":"2020-05-05T16:35:38Z","shippingAddress":{"address1":"1234 Long Avenue","address2":"2N","city":"Chicago","province":"Illinois","provinceCode":"IL","zip":"55555"}}},{"node":{"id":"gid://shopify/Order/2239959105616","name":"#1004","createdAt":"2020-05-05T16:38:27Z","shippingAddress":{"address1":"1234 Long Avenue","address2":"2N","city":"Chicago","province":"Illinois","provinceCode":"IL","zip":"55555"}}}]}},"casted_data":{},"errors":[]}

order = shop_order[:data][:orders][:edges][3]
puts order

response > {:node=>{:id=>"gid://shopify/Order/2239959105616", :name=>"#1004", :createdAt=>"2020-05-05T16:38:27Z", :shippingAddress=>{:address1=>"1234 Long Avenue", :address2=>"2N", :city=>"Chicago", :province=>"Illinois", :provinceCode=>"IL", :zip=>"55555"}}}

order_to_a = shop_order[:data][:orders][:edges][3].to_a
puts order_to_a

response > node
{:id=>"gid://shopify/Order/2239959105616", :name=>"#1004", :createdAt=>"2020-05-05T16:38:27Z", :shippingAddress=>{:address1=>"1234 Long Avenue", :address2=>"2N", :city=>"Chicago", :province=>"Illinois", :provinceCode=>"IL", :zip=>"55555"}}

How do I query and display a specific value from a key that is inside a node?

Answer 1

It's not entirely clear what your intent is, but your access of elements in a hash can be streamlined using dig :

shop_order = { 
  "data": { 
    "orders": { 
      "edges": [
        {}, {}, {}, { 
          "node": { 
            "name": '#1004', 
            "shippingAddress": { 
              "zip": '55555' 
            } 
          } 
        }
      ] 
    } 
  } 
}

Access data using:

order = shop_order.dig(:data, :orders, :edges)[3]
# => {:node=>{:name=>"#1004", :shippingAddress=>{:zip=>"55555"}}}

or:

order = shop_order.dig(:data, :orders, :edges, 3)
# => {:node=>{:name=>"#1004", :shippingAddress=>{:zip=>"55555"}}}

How do I query and display a specific value from a key that is inside a node?

Huh? If you want information inside order , do the same sort of thing:

order.dig(:node, :name) # => "#1004"
order.dig(:node, :shippingAddress, :zip) # => "55555"

or:

shop_order.dig(:data, :orders, :edges, 3, :node, :name) # => "#1004"
shop_order.dig(:data, :orders, :edges, 3, :node, :shippingAddress, :zip) # => "55555"

Many times when we're walking through a complex hash of arrays we point to the array in a variable and then work from that point. It's similar to putting your finger on a page in a recipe, so we can go back to it quickly. We do the same when parsing HTML/XML, parsed JSON and YAML, etc.