I have created the following data structure by pushing the result of a database query as hashrefs into an array: 
var1 = [
item_key => '1',
item_description => 'description 1',
item_summary => 'item summary 1',
action_key => '1',
action_summary => 'summary 1'
]

var2 = [
item_key => '1',
item_description => 'description 1',
item_summary => 'item summary 1',
action_key => '2',
action_summary => 'summary 2'
]

var3 = [
item_key => '2',
item_description => 'description 2',
item_summary => 'item summary 2',
action_key => '3',
action_summary => 'summary 3'
]

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So essentially each row is the output of a query between a table of items and a table of actions, having a one to many relationship between them. What i'd like to do is group all items for each item into the same array index, approximately thus... 
var1 = [
item_key => '1',
item_description => 'description 1',
item_summary => 'item summary 1',
action => [ key => '1',
            summary => 'summary 1'
          ],
          [ key => '2',
            summary => 'summary 2'
          ]
]

var2 = [
item_key => '2',
item_description => 'description 2',
item_summary => 'item summary 2',
action => [ key => '3',
            summary => 'summary 3'
          ]
]

[download]
How would this be possible?

In reply to Grouping an array of hashrefs by similar key values by perldj

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