INT-371 Update sampling msg dynamically

Author: imlucas

package.json

@@ -83,6 +83,7 @@
     "numeral": "^1.5.3",
     "octicons": "https://github.com/github/octicons/archive/v2.2.0.tar.gz",
     "phantomjs-polyfill": "0.0.1",
+    "pluralize": "^1.1.2",
     "qs": "^3.1.0",
     "scout-brain": "http://bin.mongodb.org/js/scout-brain/v0.0.2/scout-brain-0.0.2.tar.gz",
     "scout-client": "http://bin.mongodb.org/js/scout-client/v0.0.3/scout-client-0.0.3.tar.gz",

src/home/collection.jade

@@ -1,6 +1,6 @@
 .collection-view
-  .sampling-status
-    span This report is based on a sample of 100 documents.
+  .sampling-status(data-hook='sampling-message')
+    span This report is based on a sample of <span data-hook="sample_size">100 documents</span>.
   header
     .row
       .col-md-6

src/home/collection.js

@@ -6,6 +6,8 @@ var DocumentListView = require('../document-view');
 var RefineBarView = require('../refine-view');
 var MongoDBCollection = require('../models/mongodb-collection');
 var SampledSchema = require('../models/sampled-schema');
+var pluralize = require('pluralize');
+var format = require('util').format;
 
 module.exports = AmpersandView.extend({
   namespace: 'Collection',
@@ -30,6 +32,23 @@ module.exports = AmpersandView.extend({
       type: 'booleanClass',
       yes: 'sidebar-open',
       hook: 'json-sidebar-toggle-class'
+    },
+    sample_size: {
+      hook: 'sample_size'
+    },
+    'schema.sample_size': {
+      hook: 'sampling-message',
+      type: 'booleanClass',
+      no: 'hidden'
+    }
+  },
+  derived: {
+    sample_size: {
+      deps: ['schema.sample_size'],
+      fn: function() {
+        return format('%d %s', this.schema.sample_size,
+          pluralize('document', this.schema.sample_size));
+      }
     }
   },
   children: {
@@ -41,6 +60,7 @@ module.exports = AmpersandView.extend({
 
     this.schema.ns = this.model.getId();
     this.schema.fetch();
+
     this.model.fetch();
 
     this.listenTo(app.queryOptions, 'change', this.onQueryChanged);

src/models/sampled-schema.js

@@ -13,6 +13,12 @@ var FilterableFieldCollection = FieldCollection.extend(filterableMixin, {
 });
 
 module.exports = Schema.extend({
+  props: {
+    sample_size: {
+      type: 'number',
+      default: 0
+    }
+  },
   namespace: 'SampledSchema',
   /**
    * Our fields need to be filterable, adding a mixin
@@ -24,6 +30,7 @@ module.exports = Schema.extend({
    * Clear any data accumulated from sampling.
    */
   reset: function() {
+    this.sample_size = 0;
     this.fields.reset();
     this.count = 0;
     if (this.parent && this.parent.model && this.parent.model.documents) {
@@ -97,6 +104,7 @@ module.exports = Schema.extend({
         options.error(err, 'error', err.message);
       })
       .on('data', function(doc) {
+        model.sample_size += 1;
         if (documents) {
           documents.add(doc);
         }