循环遍历 arrays 数组中的每个 object 找到 id，将其与数组中的另一个 object 匹配并将它们连接在一起

Question

So I have an array called 'products' which contains objects and each object has a unique id. I also have another array called 'productsAdditionalInfo' which contains additional info relating to 'products' and each object has a owner_id which matches to one of the objects in the 'products' array. The 'productsAdditionalInfo' may have many objects inside an array but will always have the same owner_id relative to that array.

I'm, trying to loop through the 'productsAdditionalInfo' array get the 'owner_id' and match it to the 'id' in the products array then add the namespace as a key and the value as the value and then return it as a new array. However, it appears I'm stuck on the first hurdle. I get the first key of "Duration" in the console then I get 'namespace' of undefined.

I hope this makes sense if not I've commented out an example of how it's supposed to be. I appreciate any help.

Edit: Some people have suggested that this is similar/the same as another question where you merge them together but I believe my question is different since I'm not completely merging them together just certain bits of info.

 let products = [ {id: 102, type: "toy"}, {id: 245, type: "food"}, {id: 312, type: "clothes"} ] let productsAdditionalInfo = [ [{namespace: "Duration", value: 5, owner_id: 245}, {namespace: "effect", value: "Tail", owner_id: 245}], [{namespace: "Supplier", owner_id: 312, value: "rev"}], [{namespace: "amount", value: 0, owner_id: 102}, {namespace: "effect", value: "plush", owner_id: 102}] ] $.each(productsAdditionalInfo, function( index, product ) { console.log( product[index].namespace ); }); // let whatItShouldBe = [ {id: 102, type: "toy", amount: 0, effect: "plush" }, {id: 245, type: "food", Duration: 5, effect: "Tail"}, {id: 312, type: "clothes", Supplier: "rev"} ]

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Answer 1

One way to achieve this would be to loop through each product, retrieving the associated productAdditionsInfo based on the owner_id . From there you can create an object from the additions and merge the two together, something like this:

 let products = [{id: 102, type: "toy"}, {id: 245, type: "food"}, {id: 312, type: "clothes"}] let productsAdditionalInfo = [ [{namespace: "Duration", value: 5, owner_id: 245}, {namespace: "effect", value: "Tail", owner_id: 245}], [{namespace: "Supplier", owner_id: 312, value: "rev"}], [{namespace: "amount", value: 0, owner_id: 102}, {namespace: "effect", value: "plush", owner_id: 102}] ] let merged = products.map(p => { var info = productsAdditionalInfo.filter(i => i[0].owner_id == p.id)[0].map(i => ({ [i.namespace]: i.value })); info.push(p); return Object.assign(...info); }); console.log(merged);

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This is assuming that the second-level arrays within productsAdditionalInfo are always grouped by the same owner_id .

Answer 2

 let products = [ {id: 102, type: "toy"}, {id: 245, type: "food"}, {id: 312, type: "clothes"} ] let productsAdditionalInfo = [ [{namespace: "Duration", value: 5, owner_id: 245}, {namespace: "effect", value: "Tail", owner_id: 245}], [{namespace: "Supplier", owner_id: 312, value: "rev"}], [{namespace: "amount", value: 0, owner_id: 102}, {namespace: "effect", value: "plush", owner_id: 102}] ] const flatPAI = productsAdditionalInfo.flat(); console.log( products.map( p => Object.assign(p, ...flatPAI.filter( info => info.owner_id == p.id ).map( info => ({[info.namespace]: info.value}))) ) ); // let whatItShouldBe = [ {id: 102, type: "toy", amount: 0, effect: "plush" }, {id: 245, type: "food", Duration: 5, effect: "Tail"}, {id: 312, type: "clothes", Supplier: "rev"} ]

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