Rails controller adding quotation marks -

i have openstruct object:

[#<openstruct date="20150602", pageviews="46">, #<openstruct date="20150603", pageviews="44">]

in view, need render in format used charting, [["20150602", 46], ["20150603", 44]]

in view, can achieve like:

-@visits.map |v|   ="[#{v.date}, #{v.pageviews}]," 

and works fine. want in controller, don't need code in view , can insert data.

so try line in controller:

@visits_mapped = @visits.map {|v| "[#{v.date}, #{v.pageviews}],"} 

however, whole new bunch of quotation marks have been added in when print @visits_mapped in view, no apparent reason:

["[20150602, 46],", "[20150603, 44],"] 

why behaviour change between view , controller this? forgive me if stupid question...

i'm 95% sure you're making roundabout attempt @ generating json. generate json should use to_json.

visits = [ openstruct.new(date: "20150602", pageviews: "46"),            openstruct.new(date: "20150603", pageviews: "44") ]  # convert array of openstructs array of two-element arrays, # converting `pageviews` integer while we're @ @visits_mapped = visits.map {|visit| [ visit.date, visit.pageviews.to_i ] }  puts @visits_mapped.to_json # => [["20150602",46],["20150603",44]] 

your comments above suggest want output in data-visits attribute, can conveniently in haml:

#chart_div{ data: { visits: @visits_mapped.to_json } } 

that template evaluate following html:

<div data-visits='[["20150602",46],["20150603",44]]' id='chart_div'></div>