Created
November 9, 2012 15:47
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De-structuring a list of maps based on given keys
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def data = [ | |
[ user:'tim', time:1, age:33, weight:90, height:2.2 ], | |
[ user:'anne', time:2, height:1.8 ] | |
] | |
def destructure = { List<Map> listOfMaps, idFields=[], boolean allowNull=true -> | |
[ idFields ].flatten().with { flatFields -> | |
( listOfMaps*.keySet().flatten() as Set ).with { names -> | |
names = names - flatFields | |
listOfMaps.inject( [] ) { list, map -> | |
map.subMap( flatFields ).with { m -> | |
list.addAll( names.findResults { name -> | |
if( map[name] != null || allowNull ) { | |
[ *:m, (name): map[name] ] | |
} | |
} ) | |
list | |
} | |
} | |
} | |
} | |
} | |
assert destructure( data ) == [ | |
[user:'tim'], | |
[time:1], | |
[age:33], | |
[weight:90], | |
[height:2.2], | |
[user:'anne'], | |
[time:2], | |
[age:null], | |
[weight:null], | |
[height:1.8] | |
] | |
assert destructure( data, 'user' ) == [ | |
[user:'tim', time:1], | |
[user:'tim', age:33], | |
[user:'tim', weight:90], | |
[user:'tim', height:2.2], | |
[user:'anne', time:2], | |
[user:'anne', age:null], | |
[user:'anne', weight:null], | |
[user:'anne', height:1.8] | |
] | |
assert destructure( data, [ 'user', 'time' ] ) == [ | |
[user:'tim', time:1, age:33], | |
[user:'tim', time:1, weight:90], | |
[user:'tim', time:1, height:2.2], | |
[user:'anne', time:2, age:null], | |
[user:'anne', time:2, weight:null], | |
[user:'anne', time:2, height:1.8] | |
] | |
assert destructure( data, [ 'user', 'time' ], false ) == [ | |
[user:'tim', time:1, age:33], | |
[user:'tim', time:1, weight:90], | |
[user:'tim', time:1, height:2.2], | |
[user:'anne', time:2, height:1.8] | |
] |
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