可能重复:
Rails ActiveRecord group_by & sum db results for use with Lazy HighCharts
我对 RoR/Ruby 完全陌生,我正在使用 Lazy High Charts gem 根据一些数据库信息生成一些 purdy 图表。
我已经尝试了提供的答案,但我仍然对如何做到这一点感到有些困惑..
我需要按月/年汇总 amount_used 和 billed_amount 和分组(例如,2012 年 8 月)
最终结果将类似于具有两个系列“使用量”和“成本”的双轴图表。此信息特定于某个 account_id。
发票表
+---------------+--------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+---------------+--------------+------+-----+---------+----------------+
| id | int(11) | NO | PRI | NULL | auto_increment |
| account_id | int(11) | YES | | NULL | |
| invoice_date | varchar(255) | YES | | NULL | |
| amount_used | float | YES | | NULL | |
| billed_amount | float | YES | | NULL | |
| comments | text | YES | | NULL | |
| created_at | datetime | NO | | NULL | |
| updated_at | datetime | NO | | NULL | |
+---------------+--------------+------+-----+---------+----------------+
控制器图表代码
@account = Account.find(params[:id])
@invoices = Invoice.where("account_id = #{@account.id}").order("invoice_date DESC")
@h = LazyHighCharts::HighChart.new('area') do |f|
f.options[:chart][:defaultSeriesType] = "area"
#Sample dates right now, should be the grouped_by :invoice_date
f.xAxis( :categories => ['May', 'Jun', 'Jul'] )
f.yAxis([
{
:title => { :text => "Amount Used" }
},
{
:title => { :text => "Cost" },
:opposite => true
}
])
#Sample data right now, should be the summed amounts of the :amount_used correpsonding for each above grouped invoice_date
f.series(:name => "Amount Used", :data => [100,300,500] )
#Sample data right now, should be the summed amounts of the :billed_amount correpsonding for each above grouped invoice date
f.series(:name => "Cost", :yAxis => 1, :data => [200,400,600] )
end