[go-nuts] do I need nested maps to have mentioned output. new to golang please help

[dhaneshmane123]

I need following output 
[
  {
    date:'2017-07-07',
    flags: {
      a:1
      b:2
    }
  },
  {
    date:'2017-07-08',
    flags: {
      a:3
      b:4
    }
  }
]

so I am trying to do it as follows but not getting desired output, can some 
one suggest right approach.

type main struct{
   date : time.Time
   flags:  []*flag
}

type flag struct{
   a:int
   b:int
}

when I use this after my database query to build the map , I am getting 
error - main is not a type. 

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