Add Parse JSON Into An OpenStruct as a Ruby til

README.md

@@ -10,7 +10,7 @@ pairing with smart people at Hashrocket.
 
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-_1143 TILs and counting..._
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@@ -926,6 +926,7 @@ _1143 TILs and counting..._
 - [Or Operator Precedence](ruby/or-operator-precedence.md)
 - [Override The Initial Sequence Value](ruby/override-the-initial-sequence-value.md)
 - [Parallel Bundle Install](ruby/parallel-bundle-install.md)
+- [Parse JSON Into An OpenStruct](ruby/parse-json-into-an-open-struct.md)
 - [Parsing A CSV With Quotes In The Data](ruby/parsing-a-csv-with-quotes-in-the-data.md)
 - [Pass A Block To Count](ruby/pass-a-block-to-count.md)
 - [Passing Arbitrary Methods As Blocks](ruby/passing-arbitrary-methods-as-blocks.md)

ruby/parse-json-into-an-open-struct.md

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+# Parse JSON Into An OpenStruct
+
+The `json` module that ships with Ruby is something I use a lot in web app
+APIs. When a request comes in as a string of JSON, I use `JSON.parse` to turn
+it into a hash. That's because a hash is much easier to work with than a string
+representation of some JSON data.
+
+```ruby
+> require 'json'
+=> true
+> data = JSON.parse('{"name": "Josh", "city": "Chicago"}')
+=> {"name"=>"Josh", "city"=>"Chicago"}
+> data["name"]
+=> "Josh"
+```
+
+The hash access syntax can sometimes get to be clunky. `JSON.parse` is flexible
+enough that it can do more than turn a JSON string into a hash. It can turn it
+into any object that plays along. `OpenStruct` is a great example of this.
+
+To tell `JSON.parse` to use a class other than `Hash`, include [the
+`object_class`
+option](https://ruby-doc.org/stdlib-3.0.1/libdoc/json/rdoc/JSON.html#module-JSON-label-Parsing+Options).
+
+```ruby
+> json_str = '{"name": "Josh", "city": "Chicago"}'
+=> "{\"name\": \"Josh\", \"city\": \"Chicago\"}"
+> data = JSON.parse(json_str, object_class: OpenStruct)
+=> #<OpenStruct name="Josh", city="Chicago">
+> data.name
+=> "Josh"
+```
+
+Because of how `OpenStruct` objects work, we can use method notation to access
+the fields parsed from the JSON string.
+
+[source](https://stackoverflow.com/a/48396425/535590)