implement grid create end point

app/contracts/grids/base_contract.rb

@@ -32,14 +32,36 @@ require 'model_contract'
 
 module Grids
   class BaseContract < ::ModelContract
-    attribute :row_count
-    attribute :column_count
-    # TODO: check how this can be restricted to only MyPage
-    attribute :user
+    attribute :row_count do
+      validate_positive_integer(:row_count)
+    end
+
+    attribute :column_count do
+      validate_positive_integer(:column_count)
+    end
+
     attribute :widgets
 
+    # TODO: generalize
+    attribute :user_id,
+              writeable: -> { model.is_a?(MyPageGrid) }
+    # TODO: prevent that value from being set
+    attribute :type
+
     def self.model
       Grid
     end
+
+    private
+
+    def validate_positive_integer(attribute)
+      value = model.send(attribute)
+
+      if !value
+        errors.add(attribute, :blank)
+      elsif value < 1
+        errors.add(attribute, :greater_than, count: 0)
+      end
+    end
   end
 end

lib/api/v3/grids/grid_representer.rb

@@ -66,7 +66,7 @@ module API
                  setter: ->(fragment:, **) do
                    represented.widgets = fragment.map do |widget_fragment|
                      WidgetRepresenter
-                       .new(OpenStruct.new, current_user: current_user)
+                       .new(GridWidget.new, current_user: current_user)
                        .from_hash(widget_fragment.with_indifferent_access)
                    end
                  end

lib/api/v3/grids/grids_api.rb

@@ -52,23 +52,22 @@ module API
           end
 
           post do
-            # TODO: replace mock with actual creation
             params = API::V3::ParseResourceParamsService
                      .new(current_user, representer: GridRepresenter)
                      .call(request_body)
                      .result
 
-            # TODO: determine grid class based on the page parameter
-            call = ::Grids::SetAttributesService
-                   .new(user: current_user,
-                        grid: MyPageGrid.new_default(current_user),
-                        contract_class: ::Grids::CreateContract)
-                   .call(params)
+            call = ::Grids::CreateService
+                   .new(user: current_user)
+                   .call(attributes: params)
 
-            status 201
+            if call.success?
               GridRepresenter.create(call.result,
                                      current_user: current_user,
                                      embed_links: true)
+            else
+              fail ::API::Errors::ErrorBase.create_and_merge_errors(call.errors)
+            end
           end
 
           mount CreateFormAPI

spec/contracts/grids/create_contract_spec.rb

@@ -38,8 +38,16 @@ describe Grids::CreateContract do
   let(:instance) { described_class.new(grid, user) }
 
   shared_examples_for 'is writable' do
+    let(:default_values) do
+      {
+        row_count: 6,
+        column_count: 7
+      }
+    end
     let(:grid) do
-      FactoryBot.build_stubbed(:grid, attribute => value)
+      attributes = default_values.merge(attribute => value)
+
+      FactoryBot.build_stubbed(:grid, attributes)
     end
 
     it 'is writable' do
@@ -48,10 +56,36 @@ describe Grids::CreateContract do
     end
   end
 
+  shared_examples_for 'validates positive integer' do
+    context 'when the value is negative' do
+      let(:value) { -1 }
+
+      it 'is invalid' do
+        instance.validate
+
+        expect(instance.errors.details[attribute])
+          .to match_array [{ error: :greater_than, count: 0 }]
+      end
+    end
+
+    context 'when the value is nil' do
+      let(:value) { nil }
+
+      it 'is invalid' do
+        instance.validate
+
+        expect(instance.errors.details[attribute])
+          .to match_array [{ error: :blank }]
+      end
+    end
+  end
+
   describe 'row_count' do
     it_behaves_like 'is writable' do
       let(:attribute) { :row_count }
       let(:value) { 5 }
+
+      it_behaves_like 'validates positive integer'
     end
   end
 
@@ -59,13 +93,8 @@ describe Grids::CreateContract do
     it_behaves_like 'is writable' do
       let(:attribute) { :column_count }
       let(:value) { 5 }
-    end
-  end
 
-  describe 'page' do
-    it_behaves_like 'is writable' do
-      let(:attribute) { :page }
-      let(:value) { 'some/other/page' }
+      it_behaves_like 'validates positive integer'
     end
   end
 

spec/requests/api/v3/grids/grids_resource_spec.rb

@@ -192,7 +192,14 @@ describe 'API v3 Grids resource', type: :request, content_type: :json do
     let(:params) do
       {
         "rowCount": 10,
-        "columnCount": 15
+        "columnCount": 15,
+        "widgets": [{
+          "identifier": "work_packages_assigned",
+          "startRow": 4,
+          "endRow": 8,
+          "startColumn": 2,
+          "endColumn": 5
+        }]
       }.with_indifferent_access
     end
 
@@ -211,11 +218,53 @@ describe 'API v3 Grids resource', type: :request, content_type: :json do
       expect(subject.body)
         .to be_json_eql(params['rowCount'].to_json)
         .at_path('rowCount')
+      expect(subject.body)
+        .to be_json_eql(params['widgets'][0]['identifier'].to_json)
+        .at_path('widgets/0/identifier')
     end
 
     it 'persists the grid' do
       expect(Grid.count)
         .to eql(1)
     end
+
+    context 'with invalid params' do
+      let(:params) do
+        {
+          "rowCount": -5,
+          "columnCount": "sdjfksdfsdfdsf",
+          "widgets": [{
+            "identifier": "work_packages_assigned",
+            "startRow": 4,
+            "endRow": 8,
+            "startColumn": 2,
+            "endColumn": 5
+          }]
+        }.with_indifferent_access
+      end
+
+      it 'responds with 422' do
+        expect(subject.status).to eq(422)
+      end
+
+      it 'does not create a grid' do
+        expect(Grid.count)
+          .to eql(0)
+      end
+
+      it 'returns the errors' do
+        expect(subject.body)
+          .to be_json_eql('Error'.to_json)
+          .at_path('_type')
+
+        expect(subject.body)
+          .to be_json_eql("Row count must be greater than 0.".to_json)
+          .at_path('_embedded/errors/0/message')
+
+        expect(subject.body)
+          .to be_json_eql("Column count must be greater than 0.".to_json)
+          .at_path('_embedded/errors/1/message')
+      end
+    end
   end
 end