dont know what happened

client/lib/databasable.js

@@ -0,0 +1,70 @@
+import Loki from 'lokijs/src/lokijs';
+import LokiIndexedAdapter from 'lokijs/src/loki-indexed-adapter';
+
+const DEFAULTS = {
+  autosave: false
+};
+
+var databasable = {
+
+  accessDb: function(db_name, opts){
+    var databasable = this;
+    opts = Object.assign(Object.assign({
+      adapter: new LokiIndexedAdapter(db_name)
+    }, DEFAULTS), opts || {});
+    return new Promise((fnResolve, fnReject)=>{
+      if (!databasable.db) {
+        databasable.db = new Loki(db_name, opts);
+        databasable.db.loadDatabase({}, ()=>{
+          fnResolve(databasable.db);
+        });
+      } else { fnResolve(databasable.db); }
+
+    });
+  },
+
+  closeDb: function(){
+    var databasable = this;
+    if (databasable.db){
+      databasable.db.save();
+      databasable.db.close();
+      databasable.db = undefined;
+    }
+  },
+
+  collection: function(db_name, collection_name, options){
+    var databasable = this;
+    return databasable.accessDb(db_name)
+        .then((db)=>{
+          var collection = db.getCollection(collection_name)
+          if (!collection){
+            collection = db.addCollection(collection_name, options);
+            if (options && options.unique_indices){
+              options.unique_indices.forEach((field)=>{
+                collection.ensureUniqueIndex(field);
+              });
+            }
+          }
+          return collection;
+        });
+  },
+
+  rangeToLokiParams: function(attr, range){
+    var date_params = {};
+    if (range[0] !== undefined && range[0] !== undefined){
+      var start_condition = {},
+        end_condition = {};
+      date_params['$and'] = [start_condition, end_condition];
+      start_condition[attr] = {'$gte': range[0]};
+      end_condition[attr] = {'$lte': range[1]};
+    } else if (range[0] !== undefined) {
+      date_params[attr] = {'$gte': range[0]}
+    } else if (range[1] !== undefined) {
+      date_params[attr] = {'$lte': range[1]}
+    }
+    return date_params;
+  }
+
+};
+
+export default databasable;