clear channel feeds more efficiently; add spline type to charts

app/assets/javascripts/updateChart.js

@@ -30,8 +30,8 @@ function updateChart(index,
     }
 
     src = iframe.split('?')[0];
-    // if not a line chart, a timeslice should be present or set timescale=30
+    // if bar or column chart, a timeslice should be present or set timescale=30
-    if ($('#type_' + index).val() != 'line') {
+    if ($('#type_' + index).val() === 'bar' || $('#type_' + index).val() === 'column') {
       if ($('#timescale_' + index).val().length == 0 && $('#average_' + index).val().length == 0 && $('#median_' + index).val().length == 0 && $('#sum_' + index).val().length == 0) {
           $('#timescale_' + index).val(30);
       }

app/jobs/clear_channel_job.rb

@@ -2,7 +2,7 @@ class ClearChannelJob
   @queue = :clear_channel
 
   def self.perform(channel_id)
-    Feed.delete_all(["channel_id = ?", channel_id])
+    Feed.delete_in_batches(channel_id)
     DailyFeed.delete_all(["channel_id = ?", channel_id])
     if channel = Channel.find(channel_id)
       channel.last_entry_id = nil

app/models/feed.rb

@@ -33,6 +33,22 @@ class Feed < ActiveRecord::Base
 
   attr_readonly :created_at
 
+  # delete feeds in batches
+  def self.delete_in_batches(channel_id)
+    channel = Channel.find(channel_id)
+    connection = ActiveRecord::Base.connection
+
+    # while there are still feeds left
+    while channel.feeds.count > 0
+      # create the sql query to delete 1000 feeds from the channel
+      sql = "DELETE FROM feeds WHERE channel_id=#{channel_id} LIMIT 1000"
+      # execute the sql query
+      connection.execute(sql)
+      # wait a bit before the next delete
+      sleep 0.1
+    end
+  end
+
   # for to_xml, return only the public attributes
   def self.public_options
     {

app/views/charts/_config.html.erb

@@ -28,6 +28,7 @@
     <option>line</option>
     <option>bar</option>
     <option>column</option>
+    <option>spline</option>
   </select>
       </td>
     </tr>
@@ -194,3 +195,4 @@
 
 
 </script>
+

app/views/charts/show.html.erb

@@ -121,6 +121,9 @@
             column: {
               color: '<%= params[:color] || "#d62020" %>'
             },
+            spline: {
+              color: '<%= params[:color] || "#d62020" %>'
+            },
             series: {
               marker: {
                 radius: 3

app/views/docs/charts.html.erb

@@ -9,7 +9,7 @@
     <h1 id="charts">Charts</h1>
     The Charts API allows you to create an instant visualization of your data. The chart displays properly in all modern browsers and mobile devices. The chart can also show dynamic data by loading new data automatically.
     <br><br>
-    Use the Charts API to present numerical data stored in ThingSpeak Channels on charts. Supported chart types are line, bar, column, and step. Options include size, color, and labels.
+    Use the Charts API to present numerical data stored in ThingSpeak Channels on charts. Supported chart types are line, bar, column, spline, and step. Options include size, color, and labels.
     <br><br>
 
     <hr />