Create new polymorphic model Document.

spec/shared/models/document_validatable.rb

@@ -0,0 +1,27 @@
+shared_examples "document validations" do |documentable_factory|
+
+  let(:documentable) { build(:document, documentable_factory.to_sym) }
+
+  it "should be valid" do
+    expect(documentable).to be_valid
+  end
+
+  it "should not be valid without a user_id" do
+    documentable.user_id = nil
+
+    expect(documentable).to_not be_valid
+  end
+
+  it "should not be valid without a documentable_id" do
+    documentable.documentable_id = nil
+
+    expect(documentable).to_not be_valid
+  end
+
+  it "should not be valid without a documentable_type" do
+    documentable.documentable_type = nil
+
+    expect(documentable).to_not be_valid
+  end
+
+end