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Convert Flat to Nested Data Structure
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<cfscript> | |
function groupBy( collection, callback ) { | |
var grouping = {}; | |
for ( var item in collection ) { | |
var key = callback( item ); | |
if ( ! grouping.keyExists( key ) ) { | |
grouping[ key ] = []; | |
} | |
grouping[ key ].append( item ); | |
} | |
return grouping; | |
} | |
function nest( collection, nestingKey ) { | |
var grouped = groupBy( collection, function( item ) { | |
return item[ nestingKey ]; | |
} ); | |
var baseGroup = grouped[""]; | |
return nestSlice( baseGroup, grouped ); | |
} | |
function nestSlice( slice, collection ) { | |
if ( slice.isEmpty() ) { | |
return slice; | |
} | |
return slice.map( function( item ) { | |
return { | |
id = item.id, | |
nodeText = item.nodeText, | |
children = nestSlice( collection[ item.id ] ?: [], collection ) | |
}; | |
} ); | |
} | |
// Test data | |
TestData = querynew("id,parentId,nodeText"); | |
queryAddRow(TestData,{id:1,nodeText:"File" }); | |
queryAddRow(TestData,{id:2,nodeText:"New",parentId:1}); | |
queryAddRow(TestData,{id:3,nodeText:"File",parentId:2}); | |
queryAddRow(TestData,{id:4,nodeText:"Folder",parentId:2}); | |
queryAddRow(TestData,{id:5,nodeText:"Edit"}); | |
queryAddRow(TestData,{id:6,nodeText:"Copy",parentId:5}); | |
queryAddRow(TestData,{id:7,nodeText:"Cut",parentId:5}); | |
queryAddRow(TestData,{id:8,nodeText:"Paste",parentId:5}); | |
queryAddRow(TestData,{id:9,nodeText:"Help"}); | |
queryAddRow(TestData,{id:10,nodeText:"About",parentId:9}); | |
writeDump( nest( TestData, "parentId" ) ); | |
</cfscript> |
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