How to format data Rails

Question

I need to retrieve data from database column and put them to

[{1442507641,1},{1442507642,2},{1442507643,3},{1442507644,4}...]

format as the plot format requires.

I'm trying to do this by :

@data = TableName.where(:id => requiredid)
  .map {|r| { r.received_date.to_i => r.value } }

but this returns format

data=[{1442507641=&gt;6}, {1442507641=&gt;7}, {1442507641=&gt;5}, {1442507641=&gt;6}, {1442507641=&gt;5}, {1442507695=&gt;9}, {1442507695=&gt;9}, {1442507695=&gt;7}, {1442507695=&gt;8}]

How can I make the bracket as plot requires and remove the strange =&gt ?

you don't required key values ? comma separated hash

Arvind
– Arvind

2015-09-21 05:11:07 +00:00
Commented Sep 21, 2015 at 5:11 — Arvind
– Arvind, Commented Sep 21, 2015 at 5:11

Jordan Running · Accepted Answer · 2015-09-21 05:00:58Z

1

It seems like this ought to do what you're asking for:

parts = TableName.where(:id => requiredid).map do |r|
  sprintf("{%d,%d}", r.received_date, r.value)
end

@data = "[#{parts.join(",")}]"

answered Sep 21, 2015 at 5:00

Jordan Running

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akbarbin · Accepted Answer · 2015-09-21 07:07:20Z

1

It's only for your options to manipulate your data:

@data = []
@data = User.where(:id => requiredid).map {|r| @data << "{#{r. received_date}, #{r.value}}"}

First you make @data as array. Than collect the string into array.

answered Sep 21, 2015 at 7:07

akbarbin

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