title: No implicit conversion of ActiveSupport::HashWithIndifferentAccess into String?
body: <p>I'm developing a Shopify App with rails, and I'm trying to process the data that belongs to a webhook.</p>
  
  <p>The data I'm trying to process:</p>
  
  <pre><code>  {
      "id": 820982911946154508,
      "email": "jon@doe.ca",
      "closed_at": null,
      "created_at": "2017-09-22T14:07:04-04:00",
      "updated_at": "2017-09-22T14:07:04-04:00",
      "number": 234,
      "note": null,
      "token": "123456abcd",
      "gateway": null,
      "test": true,
      "total_price": "403.00",
      "subtotal_price": "393.00",
      "total_weight": 0,
      "total_tax": "0.00",
      "taxes_included": false,
      "currency": "USD",
      "financial_status": "voided",
      "confirmed": false,
      "total_discounts": "5.00",
      "total_line_items_price": "398.00",
      "cart_token": null,
      "buyer_accepts_marketing": true,
      "name": "#9999",
      "referring_site": null,
      "landing_site": null,
      "cancelled_at": "2017-09-22T14:07:04-04:00",
      "cancel_reason": "customer",
      "total_price_usd": null,
      "checkout_token": null,
      "reference": null,
      "user_id": null,
      "location_id": null,
      "source_identifier": null,
      "source_url": null,
      "processed_at": null,
      "device_id": null,
      "phone": null,
      "customer_locale": "en",
      "app_id": null,
      "browser_ip": null,
      "landing_site_ref": null,
      "order_number": 1234,
      "discount_codes": [
      ],
      "note_attributes": [
      ],
      "payment_gateway_names": [
        "visa",
        "bogus"
      ],
      "processing_method": "",
      "checkout_id": null,
      "source_name": "web",
      "fulfillment_status": "pending",
      "tax_lines": [
      ],
      "tags": "",
      "contact_email": "jon@doe.ca",
      "order_status_url": "https:\/\/checkout.local\/690933842\/orders\/123456abcd\/authenticate?key=abcdefg",
      "line_items": [
        {
          "id": 866550311766439020,
          "variant_id": null,
          "title": "IPod Nano - 8GB",
          "quantity": 1,
          "price": "199.00",
          "grams": 567,
          "sku": "IPOD2008PINK",
          "variant_title": null,
          "vendor": null,
          "fulfillment_service": "manual",
          "product_id": 632910392,
          "requires_shipping": true,
          "taxable": true,
          "gift_card": false,
          "name": "IPod Nano - 8GB",
          "variant_inventory_management": null,
          "properties": [
          ],
          "product_exists": true,
          "fulfillable_quantity": 1,
          "total_discount": "0.00",
          "fulfillment_status": null,
          "tax_lines": [
          ]
        },
        {
          "id": 141249953214522974,
          "variant_id": null,
          "title": "IPod Nano - 8GB",
          "quantity": 1,
          "price": "199.00",
          "grams": 567,
          "sku": "IPOD2008PINK",
          "variant_title": null,
          "vendor": null,
          "fulfillment_service": "manual",
          "product_id": 632910392,
          "requires_shipping": true,
          "taxable": true,
          "gift_card": false,
          "name": "IPod Nano - 8GB",
          "variant_inventory_management": null,
          "properties": [
          ],
          "product_exists": true,
          "fulfillable_quantity": 1,
          "total_discount": "5.00",
          "fulfillment_status": null,
          "tax_lines": [
          ]
        }
      ],
      "shipping_lines": [
        {
          "id": 271878346596884015,
          "title": "Generic Shipping",
          "price": "10.00",
          "code": null,
          "source": "shopify",
          "phone": null,
          "requested_fulfillment_service_id": null,
          "delivery_category": null,
          "carrier_identifier": null,
          "discounted_price": "10.00",
          "tax_lines": [
          ]
        }
      ],
      "billing_address": {
        "first_name": "Bob",
        "address1": "123 Billing Street",
        "phone": "555-555-BILL",
        "city": "Billtown",
        "zip": "K2P0B0",
        "province": "Kentucky",
        "country": "United States",
        "last_name": "Biller",
        "address2": null,
        "company": "My Company",
        "latitude": null,
        "longitude": null,
        "name": "Bob Biller",
        "country_code": "US",
        "province_code": "KY"
      },
      "shipping_address": {
        "first_name": "Steve",
        "address1": "123 Shipping Street",
        "phone": "555-555-SHIP",
        "city": "Shippington",
        "zip": "40003",
        "province": "Kentucky",
        "country": "United States",
        "last_name": "Shipper",
        "address2": null,
        "company": "Shipping Company",
        "latitude": null,
        "longitude": null,
        "name": "Steve Shipper",
        "country_code": "US",
        "province_code": "KY"
      },
      "fulfillments": [
      ],
      "refunds": [
      ],
      "customer": {
        "id": 115310627314723954,
        "email": "john@test.com",
        "accepts_marketing": false,
        "created_at": null,
        "updated_at": null,
        "first_name": "John",
        "last_name": "Smith",
        "orders_count": 0,
        "state": "disabled",
        "total_spent": "0.00",
        "last_order_id": null,
        "note": null,
        "verified_email": true,
        "multipass_identifier": null,
        "tax_exempt": false,
        "phone": null,
        "tags": "",
        "last_order_name": null,
        "default_address": {
          "id": 715243470612851245,
          "customer_id": 115310627314723954,
          "first_name": null,
          "last_name": null,
          "company": null,
          "address1": "123 Elm St.",
          "address2": null,
          "city": "Ottawa",
          "province": "Ontario",
          "country": "Canada",
          "zip": "K2H7A8",
          "phone": "123-123-1234",
          "name": "",
          "province_code": "ON",
          "country_code": "CA",
          "country_name": "Canada",
          "default": false
        }
      }
    }
  </code></pre>
  
  <p>So I want to get the "shipping_lines.code" and I'm trying with: </p>
  
  <p><strong>webp = webhook[:shipping_lines].first</strong></p>
  
  <p>Printing the "code" with:</p>
  
  <p><strong>Rails.logger.debug("webp::::::::::" + webp.code)</strong> </p>
  
  <p>But it raises the <em>"No implicit conversion of ActiveSupport::HashWithIndifferentAccess into String"</em> error...</p>
  
  <p>How can I solve it?</p>