snake_case key symbols (#5)

* Use snake case for request argument key symbols

* No camel case symbol key

* Fix indentation mismatch

Author: kangkyu

README.md

@@ -20,7 +20,7 @@ bundle install
 
 ```rb
 token = "ya29.a0AXeO8..."
-id = "113Xmx0YQc..."
+id = "1nNv3fyCIrvAs754Zd5c6klCjMhP7D2rmX3T9nFpjW4Q"
 editor = Gslide::Editor.new(token)
 pres = Gslide::Presentation.new(id, auth: editor)
 pres.get
@@ -32,39 +32,42 @@ editor = Gslide::Editor.new(token)
 editor.insert_presentation(title: "Once upon a time")
 #=> <Gslide::Models::Presentation:0x000000013e6d4108
 #   @id="1itXwmlLbyTRa1QKhrsO16OhJPEJUK6eh2d1nqsQfuqY">
-
 pres = _
+```
+
+```rb
 pres.batch_update({
   requests: [
     {
-      createSlide: {
-        slideLayoutReference: {
-          predefinedLayout: "BLANK"
+      create_slide: {
+        slide_layout_reference: {
+          predefined_layout: "BLANK"
         }
       }
     }
   ]
 })
+#=> true
 
 pres.get_slide_ids
-#=> ["p", "SLIDES_API1463300837_0"]
+#=> ["p", "SLIDES_API778986045_0"]
 
 pres.batch_update({
   requests: [
     {
-      createImage: {
+      create_image: {
         url: "https://drive.usercontent.google.com/download?id=1fus5psRLzIJjG3A5GAfbqu22cdEczNZQ&authuser=0",
-        elementProperties: {
-          pageObjectId: "SLIDES_API1463300837_0",
+        element_properties: {
+          page_object_id: "SLIDES_API778986045_0",
           size: {
             height: { magnitude: 200, unit: "PT" },
             width: { magnitude: 300, unit: "PT" }
           },
           transform: {
-            scaleX: 1,
-            scaleY: 1,
-            translateX: 100,
-            translateY: 100,
+            scale_x: 1,
+            scale_y: 1,
+            translate_x: 100,
+            translate_y: 100,
             unit: "PT"
           }
         }

lib/gslide.rb

@@ -1,6 +1,7 @@
 # frozen_string_literal: true
 
 require_relative "gslide/version"
+require_relative "string"
 
 require "gslide/models/models"
 

lib/gslide/models/editor.rb

@@ -22,6 +22,7 @@ def initialize(token)
       def insert_presentation(options = {})
         uri = URI(GOOGLE_SLIDES + "")
 
+        # "title" is the only allowed field in the request body
         res = post_request(uri, auth_token: @token, body: options.to_json)
         response_body = JSON(res.body)
 

lib/gslide/models/presentation.rb

@@ -30,8 +30,9 @@ def link_url
       # @see https://developers.google.com/slides/api/reference/rest/v1/presentations/batchUpdate#request-body
       def batch_update(options = {})
         uri = URI(GOOGLE_SLIDES + "/#{@id}:batchUpdate")
+        request_body = options.convert_keys { |k| k.to_s.lower_camel_case }.to_json
 
-        res = post_request(uri, auth_token: @auth.token, body: options.to_json)
+        res = post_request(uri, auth_token: @auth.token, body: request_body)
         response_body = JSON(res.body)
 
         if response_body["error"]

lib/string.rb

@@ -0,0 +1,30 @@
+# frozen_string_literal: true
+
+class String
+  def snake_case
+    gsub(/::/, '/').
+    gsub(/([A-Z]+)([A-Z][a-z])/,'\1_\2').
+    gsub(/([a-z\d])([A-Z])/,'\1_\2').
+    tr("-", "_").
+    downcase
+  end
+
+  def lower_camel_case
+    split('_').inject { |m, p| m + p.capitalize }
+  end
+end
+
+class Object
+  def convert_keys(&blk)
+    case self
+      when Array
+        self.map { |v| v.convert_keys(&blk) }
+      when Hash
+        self.map { |k, v| [blk.call(k), v.convert_keys(&blk)] }.to_h
+      else
+        self
+    end
+  end
+end
+
+# Now, you can do options.convert_keys { |k| k.lower_camel_case }