Set "required" automatically for Request Body

lib/rspec/openapi/schema_builder.rb

@@ -39,6 +39,11 @@ def build(record)
 
   private
 
+  def enrich_with_required_keys(obj)
+    obj[:required] = obj[:properties]&.keys
+    obj
+  end
+
   def response_example(record, disposition:)
     return nil if !example_enabled? || disposition
 
@@ -114,29 +119,31 @@ def build_request_body(record)
     {
       content: {
         normalize_content_type(record.request_content_type) => {
-          schema: build_property(record.request_params),
+          schema: build_property(record.request_params, set_required: true),
           example: (build_example(record.request_params) if example_enabled?),
         }.compact,
       },
     }
   end
 
-  def build_property(value, disposition: nil)
+  # TODO: Remove set_required when implementing "required" to all places
+  def build_property(value, disposition: nil, set_required: false)
     property = build_type(value, disposition)
 
     case value
     when Array
       if value.empty?
         property[:items] = {} # unknown
       else
-        property[:items] = build_property(value.first)
+        property[:items] = build_property(value.first, set_required: set_required)
       end
     when Hash
       property[:properties] = {}.tap do |properties|
         value.each do |key, v|
-          properties[key] = build_property(v)
+          properties[key] = build_property(v, set_required: set_required)
         end
       end
+      property = enrich_with_required_keys(property) if set_required
     end
     property
   end

lib/rspec/openapi/schema_merger.rb

@@ -37,7 +37,11 @@ def merge_schema!(base, spec)
         if key == 'parameters'
           base[key] = value | base[key]
           base[key].uniq! { |param| param.slice('name', 'in') }
+        elsif key == 'required'
+          # Preserve properties that appears in all test cases
+          base[key] = value & base[key]
         else
+          # last one wins
           base[key] = value
         end
       else

spec/rails/app/controllers/users_controller.rb

@@ -4,7 +4,7 @@ def create
       name: params[:name],
       relations: {
         avatar: {
-          url: params[:avatar_url],
+          url: params[:avatar_url] || 'https://example.com/avatar.png',
         },
         pets: params[:pets] || [],
       },

spec/rails/doc/openapi.json

@@ -189,7 +189,12 @@
                   "database_id": {
                     "type": "integer"
                   }
-                }
+                },
+                "required": [
+                  "name",
+                  "description",
+                  "database_id"
+                ]
               },
               "example": {
                 "name": "k0kubun",
@@ -407,9 +412,16 @@
                       "caption": {
                         "type": "string"
                       }
-                    }
+                    },
+                    "required": [
+                      "image",
+                      "caption"
+                    ]
                   }
-                }
+                },
+                "required": [
+                  "nested"
+                ]
               },
               "example": {
                 "nested": {
@@ -569,7 +581,10 @@
                   "no_content": {
                     "type": "string"
                   }
-                }
+                },
+                "required": [
+                  "no_content"
+                ]
               },
               "example": {
                 "no_content": "true"

spec/rails/doc/smart/expected.yaml

@@ -143,15 +143,13 @@ paths:
         content:
           application/json:
             schema:
-              type: object
-              properties:
-                name:
-                  type: string
-                avatar_url:
-                  type: string
+              "$ref": "#/components/schemas/PostUsersRequest"
             example:
               name: alice
               avatar_url: "https://example.com/avatar.png"
+              foo:
+                bar:
+                  baz: 42
       responses:
         '201':
           description: returns an user
@@ -266,3 +264,24 @@ components:
           type: string
         age:
           type: integer
+    PostUsersRequest:
+      type: object
+      properties:
+        name:
+          type: string
+        avatar_url:
+          type: string
+        foo:
+          type: object
+          properties:
+            bar:
+              type: object
+              properties:
+                baz:
+                  type: integer
+              required:
+                - baz
+          required:
+            - bar
+      required:
+        - name

spec/rails/doc/smart/openapi.yaml

@@ -212,16 +212,7 @@ paths:
         content:
           application/json:
             schema:
-              type: object
-              properties:
-                name:
-                  type: string
-                avatar:
-                  "$ref": "#/components/schemas/Avatar"
-                pets:
-                  type: array
-                  items:
-                    "$ref": "#/components/schemas/Pet"
+              "$ref": "#/components/schemas/PostUsersRequest"
       responses:
         '201':
           description: returns a user

spec/requests/rails_smart_merge_spec.rb

@@ -61,6 +61,25 @@
 
 RSpec.describe 'Users', type: :request do
   describe '#create' do
+    it 'accepts missing avatar_url' do
+      post '/users', headers: { authorization: 'k0kubun', 'Content-Type': 'application/json' }, params: {
+        name: 'alice',
+      }.to_json
+      expect(response.status).to eq(201)
+    end
+
+    it 'accepts nested object' do
+      post '/users', headers: { authorization: 'k0kubun', 'Content-Type': 'application/json' }, params: {
+        name: 'alice',
+        foo: {
+          bar: {
+            baz: 42,
+          },
+        },
+      }.to_json
+      expect(response.status).to eq(201)
+    end
+
     it 'returns an user' do
       post '/users', headers: { authorization: 'k0kubun', 'Content-Type': 'application/json' }, params: {
         name: 'alice',

spec/roda/doc/openapi.json

@@ -20,7 +20,10 @@
                   "id": {
                     "type": "integer"
                   }
-                }
+                },
+                "required": [
+                  "id"
+                ]
               },
               "example": {
                 "id": 1