How to sort a map by multiple params

support
1

Dear all,

I have a map of team members which I need to sort 1. alphabetical by family name and 2. by an integer assigned to each item. How can I do that when ranging over the map?

Many thanks!

2

Assuming a data structure similar to:

data/team.json 
[
  {
    "last_name": "Smith",
    "first_name": "John",
    "some_value": 2
  },
  {
    "last_name": "Smith",
    "first_name": "Robert",
    "some_value": 5
  },
  {
    "last_name": "Smith",
    "first_name": "Marcia",
    "some_value": 1
  },
  {
    "last_name": "Jones",
    "first_name": "Kevin",
    "some_value": 7
  },
  {
    "last_name": "Jones",
    "first_name": "Timothy",
    "some_value": 6
  },
  {
    "last_name": "Jones",
    "first_name": "Patricia",
    "some_value": 42
  }
]

Build a unique, sorted slice of the last names, then range through the slice, using a where clause to get matching persons.

{{ $lastNames := slice }}
{{ range site.Data.team }}
  {{ $lastNames = $lastNames | append .last_name }}
{{ end }}
{{ $lastNames = $lastNames | uniq | sort }}

{{ range $lastNames }}
  {{ range sort (where site.Data.team "last_name" .) "some_value" }}
    <pre>
      First name: {{ .first_name }}
      Last name: {{ .last_name }}
      Some value: {{ .some_value }}
    </pre>
  {{ end }}
{{ end }}
2 Likes
3

Alternatively, you can group the members via scratch.

{{ $m := slice
  (dict "fn" "Fizz" "age" 30)
  (dict "fn" "Foo" "age" 20)
  (dict "fn" "Foo" "age" 17)
  (dict "fn" "Bar" "age" 11)
  (dict "fn" "Bar" "age" 22)
  (dict "fn" "Fizz" "age" 8)
}}
{{ $data := newScratch }}
{{/* sorting by age */}}
{{ range sort $m "age" }}
  {{/* group by fn */}}
  {{ $data.Add .fn (slice .) }}
{{ end }}
{{ range $data.Values }}
  {{ range . }}
    {{ warnf "fn: %s, age: %d" .fn .age }}
  {{ end }}
{{ end }}

Result:

WARN  fn: Bar, age: 11
WARN  fn: Bar, age: 22
WARN  fn: Fizz, age: 8
WARN  fn: Fizz, age: 30
WARN  fn: Foo, age: 17
WARN  fn: Foo, age: 20
2 Likes
4

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