ruby - Creating charts with GoogleVisualr -


i have sample app created try out googlevisualr

i trying create line chart datetime on x-axis , ratings on y-axis. time series of chart of ratings based on "created_at" , ratings.

my controller:

product.all.each |p|     data_table = googlevisualr::datatable.new     data_table.new_column('datetime', 'date')     data_table.new_column('number', 'rating')     data_table.add_rows([       [p.created_at, p.rating]     ])      opts = { :width => 800, :height => 480, :title => 'graph of ratings overtime', :legend => 'bottom' }     @chart = googlevisualr::interactive::linechart.new(data_table, opts)

data:

+----+---------------------------------------------------------------+--------+-------------------------+-------------------------+ | id | title                                                         | rating | created_at              | updated_at              | +----+---------------------------------------------------------------+--------+-------------------------+-------------------------+ | 37 | abbess or abbot                                               | 2      | 2013-04-14 17:12:42 utc | 2013-05-14 17:12:42 utc | | 38 | admiral of fleet                                          | 2      | 2013-04-15 17:12:42 utc | 2013-05-14 17:12:42 utc | | 39 | aesymnetes                                                    | 2      | 2013-04-17 17:12:42 utc | 2013-05-14 17:12:42 utc | | 40 | agonothetes                                                   | 2      | 2013-03-14 17:12:42 utc | 2013-05-14 17:12:42 utc | | 41 | agoranomos                                                    | 2      | 2013-03-19 17:12:42 utc | 2013-05-14 17:12:42 utc | | 42 | air marshal                                                   | 3      | 2013-01-20 17:12:42 utc | 2013-05-14 17:12:42 utc | | 43 | aircraftman                                                   | 2      | 2013-02-22 17:12:42 utc | 2013-05-14 17:12:42 utc | | 44 | akhoond                                                       | 2      | 2013-01-13 17:12:42 utc | 2013-05-14 17:12:42 utc | | 45 | allamah                                                       | 2      | 2013-05-14 17:12:42 utc | 2013-05-14 17:12:42 utc | | 46 | amban                                                         | 2      | 2013-05-14 17:12:42 utc | 2013-05-14 17:12:42 utc | | 47 | amir al-mu'minin                                              | 2      | 2013-05-14 17:12:42 utc | 2013-05-14 17:12:42 utc | | 48 | amphipole                                                     | 2      | 2013-05-14 17:12:42 utc | 2013-05-14 17:12:42 utc | | 49 | anax                                                          | 2      | 2013-05-14 17:12:42 utc | 2013-05-14 17:12:42 utc | | 50 | apodektai                                                     | 1      | 2013-05-14 17:12:42 utc | 2013-05-14 17:12:42 utc | | 51 | apostle                                                       | 1      | 2013-05-14 17:12:42 utc | 2013-05-14 17:12:42 utc | | 52 | arahant                                                       | 3      | 2013-05-14 17:12:42 utc | 2013-05-14 17:12:42 utc | | 53 | archbishop                                                    | 3      | 2013-05-14 17:12:42 utc | 2013-05-14 17:12:42 utc | | 54 | archdeacon                                                    | 3      | 2013-05-14 17:12:42 utc | 2013-05-14 17:12:42 utc | | 55 | archduchess or archduke                                       | 3      | 2013-05-14 17:12:42 utc | 2013-05-14 17:12:42 utc | | 56 | archimandrite                                                 | 3      | 2013-05-14 17:12:42 utc | 2013-05-14 17:12:42 utc | | 57 | archon                                                        | 2      | 2013-05-14 17:12:42 utc | 2013-05-14 17:12:42 utc | | 58 | archpriest                                                    | 2      | 2013-05-14 17:12:42 utc | 2013-05-14 17:12:42 utc | | 59 | argbadh                                                       | 2      | 2013-05-14 17:12:42 utc | 2013-05-14 17:12:42 utc | | 60 | arhat                                                         | 2      | 2013-05-14 17:12:42 utc | 2013-05-14 17:12:42 utc | | 61 | asapatish                                                     | 2      | 2013-05-14 17:12:42 utc | 2013-05-14 17:12:42 utc | | 62 | aspet                                                         | 2      | 2013-05-14 17:12:42 utc | 2013-05-14 17:12:42 utc | | 63 | assistant in virtue                                           | 2      | 2013-05-14 17:12:42 utc | 2013-05-14 17:12:42 utc | | 64 | assistant professor                                           | 2      | 2013-05-14 17:12:42 utc | 2013-05-14 17:12:42 utc | | 65 | assistant president & deputy national security advisor | 2      | 2013-05-14 17:12:42 utc | 2013-05-14 17:12:42 utc | | 66 | associate professor                                           | 2      | 2013-05-14 17:12:42 utc | 2013-05-14 17:12:42 utc | | 67 | aswaran salar                                                 | 3      | 2013-05-14 17:12:42 utc | 2013-05-14 17:12:42 utc | | 68 | augusta                                                       | 3      | 2013-05-14 17:12:42 utc | 2013-05-14 17:12:42 utc | | 69 | ayatollah                                                     | 3      | 2013-05-14 17:12:42 utc | 2013-05-14 17:12:42 utc | | 70 | baivarapatish                                                 | 3      | 2013-05-14 17:12:42 utc | 2013-05-14 17:12:42 utc | | 71 | bapu                                                          | 3      | 2013-05-14 17:12:42 utc | 2013-05-14 17:12:42 utc | | 72 | baron or baroness                                             | 2      | 2013-05-14 17:12:42 utc | 2013-05-14 17:12:42 utc | +----+---------------------------------------------------------------+--------+-------------------------+-------------------------+

javascript being generated:

  google.load('visualization','1', {packages: ['corechart'], callback: function() {     var data_table = new google.visualization.datatable();data_table.addcolumn({"type":"string","label":"date"});data_table.addcolumn({"type":"number","label":"rating"});data_table.addrow([{v: "05/14"}, {v: 4}]);     var chart = new google.visualization.linechart(document.getelementbyid('chart'));     chart.draw(data_table, {width: 800, height: 480, title: "graph of ratings overtime", legend: "bottom"});   }});

output:

output:

you're creating new datatable every product. instead, should create 1 datatable add rows iterate on each product.

data_table = googlevisualr::datatable.new data_table.new_column('datetime', 'date') data_table.new_column('number', 'rating')  product.all.each |p|     data_table.add_row([p.created_at, p.rating]) end  opts = { :width => 800, :height => 480, :title => 'graph of ratings overtime', :legend => 'bottom' }  @chart = googlevisualr::interactive::linechart.new(data_table, opts)

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