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For Each: Usage example

Learn an usage example for the For Each component.

The objective of the For Each component is to go through an JSON array and, for each array item, trigger a subpipeline. For more information about the component and its parameters, refer to the For Each documentation.

Take a look at the supported usage scenario below:

  1. Obtain an example of JSON array through a call to the following address: https://viacep.com.br/ws/RS/Porto%20Alegre/Domingos/json/. For this step, use the REST V2 component as well.

  2. The result of the execution described in the previous step must return an address list. These addresses are in the "body" object. See:


{
  "status": 200,
  "statusMessage": "OK",
  "body": [
    {
      "cep": "91420-270",
      "logradouro": "Rua São Domingos",
      "complemento": "",
      "bairro": "Bom Jesus",
      "localidade": "Porto Alegre",
      "uf": "RS",
      "ibge": "4314902",
      "gia": "",
      "ddd": "51",
      "siafi": "8801"
    },
    //omitted
  ],
  "headers": {
    "Access-Control-Allow-Credentials": "true",
    "Access-Control-Allow-Headers": "Content-Type, X-Request-With, X-Requested-By",
    "Access-Control-Allow-Methods": "GET",
    "Access-Control-Allow-Origin": "*",
    "Access-Control-Max-Age": "86400",
    "Cache-Control": "max-age=3600, public",
    "Connection": "keep-alive",
    "Content-Type": "application/json; charset=utf-8",
    "Date": "Fri, 24 Nov 2023 15:20:41 GMT",
    "Expires": "Fri, 24 Nov 2023 16:20:41 GMT",
    "Pragma": "public",
    "Server": "nginx/1.22.0",
    "Transfer-Encoding": "chunked"
  }
}

  1. With a list for For Each to go through, drag the component icon to the pipeline building area.

  2. Click on the For Each item to open its configurations and specify the JSON Path expression. Through this expression is possible to:

  • specify the array to be iterated.

  • add filters for other items to be iterated.

Examples:

  • $.body.*: goes through the whole array body.

  • $.body.[?(@.bairro == ‘Cristo Redentor’)].*: goes through the array only when the attribute “bairro” is equal to “Cristo Redentor”.

  1. Access the For Each icon again to configure the execution subpipeline for each line.

At least one component must exist in the subpipeline.

  1. After designing the flow, execute the pipeline and observe that in the JSON output an execution totalizer is shown. For the execution to be accounted as successful, add the "success" : true message in the last step of the subpipeline.

Example:

Copy the content below and paste in your pipeline building using Ctrl + V (if using Windows) or Command + v (if using MAC).

[{"data":{"type":"connector","name":"rest-connector","stepName":"chamada a serviço que retorna lista","params":{"url":"https://viacep.com.br/ws/RS/Porto%20Alegre/Domingos/json/","header:content-type":"application/json","operation":"GET","connectTimeout":30000,"readTimeout":30000,"advanced":false},"accountLabel":"","id":"0cbd5b18-ac1b-47b4-9060-559fa8f1cd65","key":"component@connectorrest-connector"},"position":{"x":173,"y":66.5},"group":"nodes","removed":false,"selected":true,"selectable":true,"locked":false,"grabbable":true,"pannable":false,"classes":"eh-preview-active"},{"data":{"type":"connector","name":"for-each-connector","onProcessTrack":{"edges":[{"removed":false,"classes":"","position":{"x":0,"y":0},"locked":false,"data":{"source":"start-track","target":"7d0ab0cc-88b8-41ed-96e3-911cd9699b45","data":{"id":"3a7420c1-1c7b-4204-bda4-539416bfed20","type":"default"},"id":"aa4bd7f0-b70d-484c-8d81-98d386172d0c"},"pannable":true,"grabbable":true,"selectable":true,"selected":false,"group":"edges"},{"removed":false,"classes":"","position":{"x":0,"y":0},"locked":false,"data":{"source":"7d0ab0cc-88b8-41ed-96e3-911cd9699b45","target":"7c389a95-cbde-4ec0-9ce2-70916d1352c2","data":{"id":"fb250837-fd43-45ce-87bc-4cf5c58fe6c8","type":"default"},"id":"29527300-6a86-4975-b377-8407672ba2ec"},"pannable":true,"grabbable":true,"selectable":true,"selected":false,"group":"edges"},{"removed":false,"classes":"","position":{"x":0,"y":0},"locked":false,"data":{"source":"eb7bbaa4-0036-4ff3-b1fa-46d346e0817f","target":"7fd5e6be-6757-4c3d-8507-b77020179b02","data":{"id":"7239c7fa-2c8e-4868-be6d-b4d55f7ee712","type":"default"},"id":"244b736a-98e5-4e99-8e6e-fb838958c9ab"},"pannable":true,"grabbable":true,"selectable":true,"selected":false,"group":"edges"},{"removed":false,"classes":"","position":{"x":0,"y":0},"locked":false,"data":{"source":"3146be4d-5901-4494-b58e-4650e012fb13","target":"a8593f14-50e7-4bd5-a4d1-7bfd305986e7","data":{"id":"63e548b1-471f-43d6-8a85-18ebf92f98e7","type":"default"},"id":"735aad8e-038d-40d1-a15d-5a24d37078f0"},"pannable":true,"grabbable":true,"selectable":true,"selected":false,"group":"edges"},{"removed":false,"classes":"","position":{"x":0,"y":0},"locked":false,"data":{"source":"7c389a95-cbde-4ec0-9ce2-70916d1352c2","target":"eb7bbaa4-0036-4ff3-b1fa-46d346e0817f","data":{"id":"eccb5c57-34c6-425f-acdf-35cf1c8aa453","type":"default"},"id":"877094e9-3b29-46ef-a485-90d5be2db5d4"},"pannable":true,"grabbable":true,"selectable":true,"selected":false,"group":"edges"},{"removed":false,"classes":"","position":{"x":0,"y":0},"locked":false,"data":{"source":"7fd5e6be-6757-4c3d-8507-b77020179b02","target":"3146be4d-5901-4494-b58e-4650e012fb13","data":{"id":"092b7411-3c12-4665-8c24-c1450cb3f85e","type":"default"},"id":"bc307fbd-99f6-4f0d-9d02-12bb239bcab6"},"pannable":true,"grabbable":true,"selectable":true,"selected":false,"group":"edges"}],"nodes":[{"removed":false,"classes":"","position":{"x":41,"y":80},"locked":false,"data":{"type":"start-track","id":"start-track","key":"start-track@not-configured"},"pannable":false,"grabbable":true,"selectable":false,"selected":false,"group":"nodes"},{"removed":false,"classes":"","position":{"x":188,"y":80},"locked":false,"data":{"type":"transformer","stepName":"Pega o Campo CEP e modifica a estrutura, colocando no objeto 'url'","transformSpec":"[\n {\n \"operation\": \"shift\",\n \"spec\": {\n \"cep\": \"url.cep\"\n }\n }\n]","id":"7d0ab0cc-88b8-41ed-96e3-911cd9699b45","key":"component@transformertransformer"},"pannable":false,"grabbable":true,"selectable":true,"selected":false,"group":"nodes"},{"removed":false,"classes":"","position":{"x":497,"y":80},"locked":false,"data":{"type":"connector","name":"rest-connector","stepName":"chamada ao um serviço externo","params":{"url":"https://viacep.com.br/ws/$EXPAND{:cep,}/json/","header:content-type":"application/json","operation":"GET","connectTimeout":30000,"readTimeout":30000,"advanced":false},"accountLabel":"","id":"eb7bbaa4-0036-4ff3-b1fa-46d346e0817f","key":"component@connectorrest-connector"},"pannable":false,"grabbable":true,"selectable":true,"selected":false,"group":"nodes"},{"removed":false,"classes":"","position":{"x":799,"y":80},"locked":false,"data":{"type":"connector","name":"log-connector","stepName":"Log-Connector","params":{"logLevel":"INFO","message":"cepParam: #{url.cep} ; response: #{body}"},"id":"3146be4d-5901-4494-b58e-4650e012fb13","key":"component@connectorlog-connector"},"pannable":false,"grabbable":true,"selectable":true,"selected":false,"group":"nodes"},{"removed":false,"classes":"","position":{"x":344,"y":80},"locked":false,"data":{"type":"session-management","stepName":"salva dados relevantes para este fluxo","operation":"PUT","sessionType":"LOCAL","scoped":true,"fields":["url"],"id":"7c389a95-cbde-4ec0-9ce2-70916d1352c2","key":"component@session-managementsession-management"},"pannable":false,"grabbable":true,"selectable":true,"selected":false,"group":"nodes"},{"removed":false,"classes":"","position":{"x":651,"y":80},"locked":false,"data":{"type":"session-management","stepName":"recupera informações salvas no fluxo.","operation":"GET","sessionType":"LOCAL","scoped":true,"fields":["url"],"id":"7fd5e6be-6757-4c3d-8507-b77020179b02","key":"component@session-managementsession-management"},"pannable":false,"grabbable":true,"selectable":true,"selected":false,"group":"nodes"},{"removed":false,"classes":"","position":{"x":956,"y":80},"locked":false,"data":{"type":"transformer","stepName":"adicionar success para contabilizar o registro","transformSpec":"[\n {\n \"operation\": \"default\",\n \"spec\": {\n \"success\": true\n }\n }\n]","id":"a8593f14-50e7-4bd5-a4d1-7bfd305986e7","key":"component@transformertransformer"},"pannable":false,"grabbable":true,"selectable":true,"selected":false,"group":"nodes"}]},"stepName":"itera os registros de body","params":{"jsonPath":"$.body","parallel":false,"onProcess":"start-track"},"id":"c26a2684-610c-44cf-b5f1-1ca093cc9bb4","key":"component@connectorfor-each-connector"},"position":{"x":319,"y":66.5},"group":"nodes","removed":false,"selected":true,"selectable":true,"locked":false,"grabbable":true,"pannable":false,"classes":""},{"data":{"id":"47080cfd-e0f1-4310-af7f-9c8eef40e54c","source":"0cbd5b18-ac1b-47b4-9060-559fa8f1cd65","target":"c26a2684-610c-44cf-b5f1-1ca093cc9bb4","data":{"type":"default","conditionType":null,"conditionRule":null,"condition":null,"label":null}},"position":{"x":0,"y":0},"group":"edges","removed":false,"selected":true,"selectable":true,"locked":false,"grabbable":true,"pannable":true,"classes":""}]
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