Configure grape to build with strong params

app/api/using_grape/artworks_endpoint.rb

@@ -2,6 +2,12 @@ module UsingGrape
   class ArtworksEndpoint < Grape::API
     format :json
 
+    helpers do
+      def artwork_params
+        params.permit(:amount_cents, :artist_name, :medium, :title)
+      end
+    end
+
     namespace :artworks do
       get do
         Artwork.all.order(featured: :desc, created_at: :desc)
@@ -12,7 +18,7 @@ class ArtworksEndpoint < Grape::API
       end
 
       post do
-        artwork = Artwork.new(params)
+        artwork = Artwork.new(artwork_params)
         if artwork.save
           artwork
         else
@@ -23,7 +29,7 @@ class ArtworksEndpoint < Grape::API
 
       put ":id" do
         artwork = Artwork.find(params[:id])
-        if artwork.update(params)
+        if artwork.update(artwork_params)
           artwork
         else
           errors = {errors: artwork.errors.full_messages.to_sentence}

config/initializers/grape.rb

@@ -0,0 +1,11 @@
+module StrongParamsBuilder
+  def build_params
+    ActionController::Parameters.new(rack_params).tap do |params|
+      params.deep_merge!(grape_routing_args) if env.key?(Grape::Env::GRAPE_ROUTING_ARGS)
+    end
+  end
+end
+
+Grape.configure do |config|
+  config.param_builder = StrongParamsBuilder
+end