Remove FilterRelation.In / "property IN" queries, upgrade googleapis{,_beta} dependencies

lib/src/datastore_impl.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library gcloud.datastore_impl;
 
 import 'dart:async';
 
 import 'package:http/http.dart' as http;
 
@@ skipping 192 matching lines @@
     }
     return apiEntity;
   }
 
   static Map<datastore.FilterRelation, String> relationMapping = const {
     datastore.FilterRelation.LessThan: 'LESS_THAN',
     datastore.FilterRelation.LessThanOrEqual: 'LESS_THAN_OR_EQUAL',
     datastore.FilterRelation.Equal: 'EQUAL',
     datastore.FilterRelation.GreatherThan: 'GREATER_THAN',
     datastore.FilterRelation.GreatherThanOrEqual: 'GREATER_THAN_OR_EQUAL',
-    // TODO(Issue #5): IN operator not supported currently.
   };
 
   api.Filter _convertDatastore2ApiFilter(datastore.Filter filter) {
     var pf = new api.PropertyFilter();
     var operator = relationMapping[filter.relation];
-    // FIXME(Issue #5): Is this OK?
-    if (filter.relation == datastore.FilterRelation.In) {
-      operator = 'EQUAL';
-    }
-
     if (operator == null) {
       throw new ArgumentError('Unknown filter relation: ${filter.relation}.');
     }
     pf.op = operator;
     pf.property = new api.PropertyReference()..name = filter.name;
-
-    // FIXME(Issue #5): Is this OK?
-    var value = filter.value;
-    if (filter.relation == datastore.FilterRelation.In) {
-      if (value is List && value.length == 1) {
-        value = value.first;
-      } else {
-        throw new ArgumentError('List values not supported (was: $value).');
-      }
-    }
-
-    pf.value = _convertDatastore2ApiPropertyValue(value, true, lists: false);
+    pf.value = _convertDatastore2ApiPropertyValue(
+        filter.value, true, lists: false);
     return new api.Filter()..propertyFilter = pf;
   }
 
   api.Filter _convertDatastoreAncestorKey2ApiFilter(datastore.Key key) {
     var pf = new api.PropertyFilter();
     pf.op = 'HAS_ANCESTOR';
     pf.property = new api.PropertyReference()..name = '__key__';
     pf.value = new api.Value()
         ..keyValue = _convertDatastore2ApiKey(key, enforceId: true);
     return new api.Filter()..propertyFilter = pf;
@@ skipping 377 matching lines @@
       return new Future.sync(() {
         throw new ArgumentError('Cannot call next() on last page.');
       });
     }
 
     return QueryPageImpl.runQuery(
         _api, _project, _nextRequest, _remainingNumberOfEntities)
         .catchError(DatastoreImpl._handleError);
   }
 }