Created
August 11, 2020 14:33
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How to do combination ASC, DESC sorting in Ruby
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| collection = [ | |
| { | |
| 'contract_number' => '123456', | |
| 'contract_level' => 1, | |
| 'contact_name' => 'craig' | |
| }, { | |
| 'contract_number' => '654321', | |
| 'contract_level' => 2, | |
| 'contact_name' => 'david' | |
| }, { | |
| 'contract_number' => '564321', | |
| 'contract_level' => 1, | |
| 'contact_name' => 'david' | |
| } | |
| ] | |
| sort_parts = [ | |
| { 'colId' => 'contact_name', 'sort' => 'asc' }, | |
| { 'colId' => 'contract_level', 'sort' => 'desc' } | |
| ] | |
| asc_columns, desc_columns = sort_parts.partition { |part| part['sort'] == 'asc' } | |
| asc_columns = asc_columns.map { |part| part['colId'] } | |
| desc_columns = desc_columns.map { |part| part['colId'] } | |
| sorted_results = collection.sort do |a, b| | |
| left_side = [] | |
| right_side = [] | |
| unless asc_columns.empty? | |
| left_side.push(*asc_columns.map { |col| a[col] }) | |
| right_side.push(*asc_columns.map { |col| b[col] }) | |
| end | |
| unless desc_columns.empty? | |
| # Notice switch between `right_side` and `left_side`, but keeping `a` and `b` | |
| right_side.push(*desc_columns.map { |col| a[col] }) | |
| left_side.push(*desc_columns.map { |col| b[col] }) | |
| end | |
| left_side <=> right_side | |
| end | |
| puts sorted_results.inspect |
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