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Chartkick Graph Accumulate values

Simon P asked in Rails

Hi

Using Rails, Chartkick and Groupdate I have a graph which shows values.

In the view:

<%= line_chart @ContractsForChart.group_by_month(:contract_date).sum(:units), xtitle: "Months", ytitle: "Units Sold" %>

In the controller:

@ContractsForChart = Contract.joins(:store)

I would like the values (the units) to accumulate, how could I do this please?

Simon

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