diff --git a/panoramix/highchart.py b/panoramix/highchart.py
index 295d80537920e..9f3cf2d48d186 100644
--- a/panoramix/highchart.py
+++ b/panoramix/highchart.py
@@ -16,7 +16,6 @@ def json(self):
             .replace("\n", " ")
         )
 
-
     @property
     def javascript_cmd(self):
         js = self.json
diff --git a/panoramix/models.py b/panoramix/models.py
index 575764dc79266..20197e90cefbe 100644
--- a/panoramix/models.py
+++ b/panoramix/models.py
@@ -33,15 +33,17 @@ class Slice(Model, AuditMixin):
     __tablename__ = 'slices'
     id = Column(Integer, primary_key=True)
     slice_name = Column(String(250))
-    datasource_id = Column(Integer, ForeignKey('datasources.id'))
+    druid_datasource_id = Column(Integer, ForeignKey('datasources.id'))
     table_id = Column(Integer, ForeignKey('tables.id'))
     datasource_type = Column(String(200))
     datasource_name = Column(String(2000))
     viz_type = Column(String(250))
     params = Column(Text)
 
-    table = relationship('Table', backref='slices')
-    druid_datasource = relationship('Datasource', backref='slices')
+    table = relationship(
+        'Table', foreign_keys=[table_id], backref='slices')
+    druid_datasource = relationship(
+        'Datasource', foreign_keys=[druid_datasource_id], backref='slices')
 
     def __repr__(self):
         return self.slice_name
@@ -50,6 +52,11 @@ def __repr__(self):
     def datasource(self):
         return self.table or self.druid_datasource
 
+    @property
+    def datasource_id(self):
+        datasource = self.datasource
+        return datasource.id if datasource else None
+
     @property
     def slice_link(self):
         d = json.loads(self.params)
@@ -69,6 +76,9 @@ def css_files(self):
         from panoramix.viz import viz_types
         return viz_types[self.viz_type].css_files
 
+    def get_viz(self):
+        pass
+
 
 dashboard_slices = Table('dashboard_slices', Model.metadata,
     Column('id', Integer, primary_key=True),
diff --git a/panoramix/templates/panoramix/dashboard.html b/panoramix/templates/panoramix/dashboard.html
index d56ea6f8c0d1f..23fc55519a3ba 100644
--- a/panoramix/templates/panoramix/dashboard.html
+++ b/panoramix/templates/panoramix/dashboard.html
@@ -73,7 +73,7 @@ <h5>{{ slice.slice_name }}</h5>
         widget_base_dimensions: [150, 150],
         resize: {enabled: true}
     });
-    var url = "/panoramix/table/2/?flt_col_0=gender&datasource_id=2&flt_op_0=in&viz_type=pie&since=50%20years%20ago&until=now&metrics=total&limit=10&granularity=one%20day&datasource_name=baby_names&slice_name=Pie&where=&groupby=name&flt_eq_0=&datasource_type=table&standalone=true&skip_libs=true";
+    var url = "/panoramix/table/2/?flt_col_0=gender&rolling_periods=&datasource_id=2&flt_op_0=in&slice_name=Super%20Slice&viz_type=line&since=50%20years%20ago&groupby=name&metrics=total&limit=25&flt_eq_0=&granularity=one%20day&datasource_name=baby_names&where=&until=now&rolling_type=mean&datasource_type=table&skip_libs=true&standalone=true";
     $.ajax({
         url: url,
         success: function(result){
@@ -81,7 +81,7 @@ <h5>{{ slice.slice_name }}</h5>
         },
         async: true,
     });
-    var url = "/panoramix/table/2/?flt_col_0=gender&rolling_periods=&datasource_id=2&flt_op_0=in&slice_name=Super%20Slice&viz_type=line&since=50%20years%20ago&groupby=name&metrics=total&limit=25&flt_eq_0=&granularity=one%20day&datasource_name=baby_names&where=&until=now&rolling_type=mean&datasource_type=table&standalone=true&skip_libs=true";
+    var url = "/panoramix/table/2/?flt_col_0=gender&datasource_id=2&flt_op_0=in&viz_type=pie&since=50%20years%20ago&until=now&metrics=total&limit=10&granularity=one%20day&datasource_name=baby_names&slice_name=Pie&where=&groupby=name&flt_eq_0=&datasource_type=table&skip_libs=true&standalone=true";
     $.ajax({
         url: url,
         success: function(result){
diff --git a/panoramix/templates/panoramix/viz_highcharts.html b/panoramix/templates/panoramix/viz_highcharts.html
index 25a78f4e067ba..140e2e25cfbe2 100644
--- a/panoramix/templates/panoramix/viz_highcharts.html
+++ b/panoramix/templates/panoramix/viz_highcharts.html
@@ -1,8 +1,7 @@
 {% macro viz_html(viz) %}
-  <div id="chart" style="height:100%; width:100%;">
-    
-    <img src="{{ url_for("static", filename="loading.gif") }}" class="loading">
-  </div>
+<div id="{{ viz.token }}" style="height:100%; width:100%;">
+  <img src="{{ url_for("static", filename="loading.gif") }}" class="loading">
+</div>
 {% endmacro %}
 
 {% macro viz_js(viz) %}
@@ -24,10 +23,11 @@
     console.log(url);
     $.getJSON(url, function(data){
         console.log(data);
-        new Highcharts.{{ viz.chart_call }}(data);
+        $("#{{ viz.token }}").highcharts('{{ viz.chart_call }}', data);
     })
-    .fail(function() {
-      console.log( "error" );
+    .fail(function(xhr) {
+      var err = '<div class="alert alert-danger">' + xhr.responseText  + '</div>';
+      $("#{{ viz.token }}").html(err);
     });
   });
 </script>
diff --git a/panoramix/templates/panoramix/viz_table.html b/panoramix/templates/panoramix/viz_table.html
index fa3a2d3a6ddd8..b08a147048f95 100644
--- a/panoramix/templates/panoramix/viz_table.html
+++ b/panoramix/templates/panoramix/viz_table.html
@@ -26,7 +26,7 @@
       </tbody>
     </table>
   {% else %}
-  <div id="unique" style="display: none;">
+  <div id="{{ viz.token }}" style="display: none;">
   </div>
   <img src="{{ url_for("static", filename="loading.gif") }}" class="loading">
   {% endif %}
@@ -37,13 +37,13 @@
   <script>
     var url = window.location + '&async=true&standalone=true&skip_libs=true';
     console.log(url);
-    $("#unique").load(url, function(){
+    $("#{{ viz.token }}").load(url, function(){
       var table = $('table').DataTable({
         paging: false,
-      });
+      })
+      $("#{{ viz.token }}").show();
       table.column('-1').order( 'desc' ).draw();
       $("img.loading").hide();
-      $("#unique").show();
     });
   </script>
   {% endif %}
diff --git a/panoramix/views.py b/panoramix/views.py
index 2bee21d33f53e..a1ca23a3a5022 100644
--- a/panoramix/views.py
+++ b/panoramix/views.py
@@ -220,9 +220,15 @@ def table(self, table_id):
             table,
             form_data=request.args, view=self)
         if request.args.get("json") == "true":
+            try:
+                payload = obj.get_json()
+                status=200
+            except Exception as e:
+                payload = str(e)
+                status=500
             return Response(
-                obj.get_json(),
-                #status=200,
+                payload,
+                status=status,
                 mimetype="application/json")
         else:
             return self.render_template("panoramix/viz.html", viz=obj)
diff --git a/panoramix/viz.py b/panoramix/viz.py
index 0fcf66bc087b1..6c498ea1d8b7f 100644
--- a/panoramix/viz.py
+++ b/panoramix/viz.py
@@ -3,7 +3,7 @@
 import pandas as pd
 from collections import OrderedDict
 import config
-import logging
+import uuid
 import numpy as np
 
 from panoramix import utils
@@ -11,9 +11,7 @@
 from panoramix.forms import form_factory
 
 CHART_ARGS = {
-    #'height': 700,
     'title': None,
-    'target_div': 'chart',
 }
 
 
@@ -28,6 +26,7 @@ class BaseViz(object):
     css_files = []
 
     def __init__(self, datasource, form_data, view):
+        self.token = form_data.get('token', 'token_' + uuid.uuid4().hex[:8])
         self.datasource = datasource
         self.view = view
         self.form_data = form_data
@@ -97,7 +96,7 @@ def query_obj(self):
         to_dttm = utils.parse_human_datetime(until)
         if from_dttm >= to_dttm:
             flash("The date range doesn't seem right.", "danger")
-            from_dttm = to_dttm  # Making them identicial to not raise
+            from_dttm = to_dttm  # Making them identical to not raise
 
         # extras are used to query elements specific to a datasource type
         # for instance the extra where clause that applies only to Tables
@@ -183,16 +182,20 @@ def query_obj(self):
             raise Exception("Pick a metric for x, y and size")
         return d
 
-    def render(self):
-        df = self.df.fillna(0)
+    def get_df(self):
+        df = super(BubbleViz, self).get_df()
+        df = df.fillna(0)
         df['x'] = df[[self.x_metric]]
         df['y'] = df[[self.y_metric]]
         df['z'] = df[[self.z_metric]]
         df['name'] = df[[self.entity]]
         df['group'] = df[[self.series]]
+        return df
+
+    def get_json(self):
+        df = self.get_df()
         chart = HighchartBubble(df)
-        self.chart_js = chart.javascript_cmd
-        return super(BubbleViz, self).render()
+        return chart.json
 
 
 class TimeSeriesViz(HighchartsViz):