linqts-按多个属性分组

Question

I have an array of JSON objects which have to be grouped by multiple properties.

 const JSON_DATA = [ {"componentName":"CP1","articleNumber":"441","componentType":"Ext","version":"V1.1.6"}, {"componentName":"CP5","articleNumber":"444","componentType":"Int","version":"V2.1.8"}, {"componentName":"CP5","articleNumber":"444","componentType":"Ext","version":"V2.1.0"}, {"componentName":"CP5","articleNumber":"444","componentType":"Ext","version":"V2.1.8"}, {"componentName":"CP4","articleNumber":"442","componentType":"Ext","version":"V1.1.0"}]; 

I'd like to use linqts to group by componentName, articleNumber and componentType.

 interface IComponent { componentName: String; articleNumber: String; componentType: String; version: String; } class JsonGroupBy { public groupBy(data: IComponent[]): any { let mylist = new List < IComponent > (data); let result = mylist.GroupBy((comp) => comp.componentName, (comp) => comp.version); return result; } } 

This is working but I can't figure out how to group not only by componentName but also by articleNumber and componentType. The current output looks like this:

 {"CP1": ["V1.1.6"], "CP4": ["V1.1.0"], "CP5": ["V2.1.8", "V2.1.0", "V2.1.8"]} 

My prefered result would be like this:

 [ {"componentName": "CP1","articleNumber":"441","componentType":"Ext","version": ["V1.1.6"]}, {"componentName": "CP5","articleNumber":"444","componentType":"Int","version": ["V2.1.8"]}, {"componentName": "CP5","articleNumber":"444","componentType":"Ext","version": ["V2.1.0","2.1.8"]}, {"componentName": "CP4","articleNumber":"442","componentType":"Ext","version": ["V1.1.0"]} ] 

Answer 1

You could collect the version and build a new data set for each group.

 const JSON_DATA = [{ componentName: "CP1", articleNumber: "441", componentType: "Ext", version: "V1.1.6" }, { componentName: "CP5", articleNumber: "444", componentType: "Int", version: "V2.1.8" }, { componentName: "CP5", articleNumber: "444", componentType: "Ext", version: "V2.1.0" }, { componentName: "CP5", articleNumber: "444", componentType: "Ext", version: "V2.1.8" }, { componentName: "CP4", articleNumber: "442", componentType: "Ext", version: "V1.1.0" }], result = Enumerable .From(JSON_DATA) .GroupBy( null, "$.version", "{ componentName: $.componentName, articleNumber: $.articleNumber, componentType: $.componentType, version: $$.ToArray() }", "[$.componentName, $.articleNumber, $.componentType].join('|')" ) .ToArray(); console.log(result); 

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