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  4. Remove Objects Containing Specified Key-Value Pairs

Remove Objects Containing Specified Key-Value Pairs

This DataWeave example removes all objects that contain a set of key-value pairs from an array of objects. Before you begin, note that 2.x versions of DataWeave are used by Mule 4 apps. For DataWeave in Mule 3 apps, refer to DataWeave version 1.2 examples. For other DataWeave versions, you can use the version selector in the DataWeave table of contents.

This example uses the following functions:

  • filter iterates over the objects within the input array to return an array with the objects that return true as the result of an expression. Each object in the input array contains a set of key-value pairs. The expression uses the contains function and the not operator.

  • contains identifies the key-value pairs specified in the dropThese variable. This variable is an array of objects containing the key-value pairs to remove.

    not negates the result of the contains function to make filter remove the key-value pairs identified in dropThese from the final output. (Without not, the result is an array of objects containing only the undesired key-value pairs.)

DataWeave Script:
%dw 2.0
var dropThese = [
{"type" : "secondary", "space" : "rgb"},
{"type" : "primary", "space" : "cmyk"}
]
output application/json
---
payload filter (not (dropThese contains {"type": $."type", "space": $."space"}))
Input JSON Payload:
[
    {"sequence": "1", "color": "red", "type": "primary", "space": "rgb"},
    {"sequence": "2", "color": "green", "type": "primary", "space": "rgb"},
    {"sequence": "3", "color": "blue", "type": "primary", "space": "rgb"},
    {"sequence": "4", "color": "yellow", "type": "secondary", "space": "rgb"},
    {"sequence": "5", "color": "magenta", "type": "secondary", "space": "rgb"},
    {"sequence": "6", "color": "cyan", "type": "secondary", "space": "rgb"},
    {"sequence": "7", "color": "cyan", "type": "primary", "space": "cmyk"},
    {"sequence": "8", "color": "magenta", "type": "primary", "space": "cmyk"},
    {"sequence": "9", "color": "yellow", "type": "primary", "space": "cmyk"},
    {"sequence": "10", "color": "red", "type": "secondary", "space": "cmyk"},
    {"sequence": "11", "color": "green", "type": "secondary", "space": "cmyk"},
    {"sequence": "12", "color": "blue", "type": "secondary", "space": "cmyk"}
]
Output JSON:
[
  {
    "sequence": "1",
    "color": "red",
    "type": "primary",
    "space": "rgb"
  },
  {
    "sequence": "2",
    "color": "green",
    "type": "primary",
    "space": "rgb"
  },
  {
    "sequence": "3",
    "color": "blue",
    "type": "primary",
    "space": "rgb"
  },
  {
    "sequence": "10",
    "color": "red",
    "type": "secondary",
    "space": "cmyk"
  },
  {
    "sequence": "11",
    "color": "green",
    "type": "secondary",
    "space": "cmyk"
  },
  {
    "sequence": "12",
    "color": "blue",
    "type": "secondary",
    "space": "cmyk"
  }
]

See Also