New to Rails. How can I export data from my database( I'm using Sqlite3) into a chart in rails? I have 2 columns I would like to visualizes, Timestamps and Decimal values.
I have seen plenty of examples on how to display data with Google Charts in rails, but never data from a db.
Any instruction or examples would be appreciated.
编写一个将返回 json 数据的 web 服务，用它来填充图表看这里http://pivotallabs.com/building-a-fast-lightweight-rest-service-with-rails-3/
Well, I guest you are using googlecharts gem. In the page there are a lot of really basic examples. like this one:
Gchart.line(:data => [0, 40, 10, 70, 20])
So, instead of put the numbers, yo can put your data like this
Gchart.line(:data => MyModel.pluck(:my_attribute))
where my_atributte is a column in the MyModel Object
this will create a link like this: http://chart.apis.google.com/chart?chd=s:AjI9R&cht=lc&chs=300x200&chxr=0,0,70
and you can use it as you want... maybe put in a img tag or whatever