Be less restrictive

src/generator.coffee

@@ -74,7 +74,7 @@ validateModel = (model, id, models) ->
   # checks that model has an id
   if model.id isnt id
     throw new Error("model #{id} not declared with the same id") 
-  unless _.isObject(model.properties) and !_.isEmpty(model.properties)
+  unless !_.isEmpty(model.properties) or model.additionalProperties or !_.isEmpty(model.items)
     throw new Error("model #{id} does not declares properties")
   if models[id]?
     throw new Error("model #{id} has already been defined")
@@ -225,4 +225,4 @@ module.exports = (app, descriptor, resources, options = {}) ->
 
       return res.json(result)
 
-    next()
+    next()

test/apiGeneration.coffee

@@ -73,7 +73,7 @@ describe 'API generation tests', ->
       ]
     , /Response not declared with the same id/
 
-  it 'should fail on model with invalid id', ->
+  it 'should fail on model without properties', ->
     assert.throws ->
       swagger.generator express(), {}, [
         api:
@@ -84,6 +84,42 @@ describe 'API generation tests', ->
       ]
     , /Response1 does not declares properties/
 
+  it 'should not fail on model with properties', ->
+    swagger.generator express(), {}, [
+      api:
+        resourcePath: '/test'
+        apis: [path: '/test/1'],
+        models:
+          Response1:
+            id: 'Response1'
+            properties: name: type: 'string'
+      controller: require './fixtures/sourceCrud'
+    ]
+
+  it 'should not fail on model with additionalProperties', ->
+    swagger.generator express(), {}, [
+      api:
+        resourcePath: '/test'
+        apis: [path: '/test/1'],
+        models:
+          Response1:
+            id: 'Response1'
+            additionalProperties: {}
+      controller: require './fixtures/sourceCrud'
+    ]
+
+  it 'should not fail on model with items', ->
+    swagger.generator express(), {}, [
+      api:
+        resourcePath: '/test'
+        apis: [path: '/test/1'],
+        models:
+          Response1:
+            id: 'Response1'
+            items: type: 'string'
+      controller: require './fixtures/sourceCrud'
+    ]
+
   it 'should fail on model already defined', ->
     assert.throws ->
       swagger.generator express(), {}, [
@@ -682,4 +718,4 @@ describe 'API generation tests', ->
                 nickname: 'remove'
               ]
             ]
-          done()
+          done()