Fix array parameters support in the Flask adapter

tests/test_flask.py

@@ -9,6 +9,11 @@ class Model(Base):
     name = text
 
 
+class Criterion(Base):
+    op = text
+    attr = text
+    value = text
+
 test_app = Flask(__name__)
 
 
@@ -25,9 +30,13 @@ def divide_by_zero():
 
 
 @test_app.route('/models')
-@signature([Model])
-def list_models():
-    return [Model(name='first')]
+@signature([Model], [Criterion])
+def list_models(q=None):
+    if q:
+        name = q[0].value
+    else:
+        name = 'first'
+    return [Model(name=name)]
 
 
 @test_app.route('/models/<name>')
@@ -63,6 +72,14 @@ class FlaskrTestCase(unittest.TestCase):
         resp = self.app.get('/models')
         assert resp.status_code == 200
 
+    def test_array_parameter(self):
+        resp = self.app.get('/models?q.op=%3D&q.attr=name&q.value=second')
+        assert resp.status_code == 200
+        print resp.data
+        self.assertEquals(
+            resp.data, '[{"name": "second"}]'
+        )
+
     def test_post_model(self):
         resp = self.app.post('/models', data={"body.name": "test"})
         assert resp.status_code == 200

wsme/rest/args.py

@@ -81,11 +81,19 @@ def from_params(datatype, params, path, hit_paths):
 
 @from_params.when_type(ArrayType)
 def array_from_params(datatype, params, path, hit_paths):
+    if hasattr(params, 'getall'):
+        # webob multidict
+        def getall(params, path):
+            return params.getall(path)
+    elif hasattr(params, 'getlist'):
+        # werkzeug multidict
+        def getall(params, path):  # noqa
+            return params.getlist(path)
     if path in params:
         hit_paths.add(path)
         return [
             from_param(datatype.item_type, value)
-            for value in params.getall(path)]
+            for value in getall(params, path)]
 
     if iscomplex(datatype.item_type):
         attributes = set()
@@ -99,7 +107,7 @@ def array_from_params(datatype, params, path, hit_paths):
             for attrdef in list_attributes(datatype.item_type):
                 attrpath = '%s.%s' % (path, attrdef.key)
                 hit_paths.add(attrpath)
-                attrvalues = params.getall(attrpath)
+                attrvalues = getall(params, attrpath)
                 if len(value) < len(attrvalues):
                     value[-1:] = [
                         datatype.item_type()
@@ -158,7 +166,9 @@ def args_from_args(funcdef, args, kwargs):
         newargs.append(from_param(argdef.datatype, arg))
     newkwargs = {}
     for argname, value in kwargs.items():
-        newkwargs[argname] = from_param(funcdef.get_arg(argname).datatype, value)
+        newkwargs[argname] = from_param(
+            funcdef.get_arg(argname).datatype, value
+        )
     return newargs, newkwargs