=======
Example
=======

This example takes the value of `address.state` and copies it to a field on the `state` field.



.. code-block:: json
    :caption: Configuration

    {
      "transforms" : "extractNestedField",
      "transforms.extractNestedField.type" : "com.github.jcustenborder.kafka.connect.transform.common.ExtractNestedField$Value",
      "transforms.extractNestedField.input.inner.field.name" : "state",
      "transforms.extractNestedField.input.outer.field.name" : "address",
      "transforms.extractNestedField.output.field.name" : "state"
    }

.. code-block:: json
    :caption: Input
    

    {
      "topic" : "topic",
      "kafkaPartition" : 1,
      "valueSchema" : {
        "type" : "STRUCT",
        "isOptional" : false,
        "fieldSchemas" : {
          "first_name" : {
            "type" : "STRING",
            "isOptional" : false
          },
          "last_name" : {
            "type" : "STRING",
            "isOptional" : false
          },
          "address" : {
            "name" : "Address",
            "type" : "STRUCT",
            "isOptional" : false,
            "fieldSchemas" : {
              "city" : {
                "type" : "STRING",
                "isOptional" : false
              },
              "state" : {
                "type" : "STRING",
                "isOptional" : false
              }
            }
          }
        }
      },
      "value" : {
        "schema" : {
          "type" : "STRUCT",
          "isOptional" : false,
          "fieldSchemas" : {
            "first_name" : {
              "type" : "STRING",
              "isOptional" : false
            },
            "last_name" : {
              "type" : "STRING",
              "isOptional" : false
            },
            "address" : {
              "name" : "Address",
              "type" : "STRUCT",
              "isOptional" : false,
              "fieldSchemas" : {
                "city" : {
                  "type" : "STRING",
                  "isOptional" : false
                },
                "state" : {
                  "type" : "STRING",
                  "isOptional" : false
                }
              }
            }
          }
        },
        "fieldValues" : [ {
          "name" : "first_name",
          "schema" : {
            "type" : "STRING",
            "isOptional" : false
          },
          "storage" : "test"
        }, {
          "name" : "last_name",
          "schema" : {
            "type" : "STRING",
            "isOptional" : false
          },
          "storage" : "developer"
        }, {
          "name" : "address",
          "schema" : {
            "name" : "Address",
            "type" : "STRUCT",
            "isOptional" : false,
            "fieldSchemas" : {
              "city" : {
                "type" : "STRING",
                "isOptional" : false
              },
              "state" : {
                "type" : "STRING",
                "isOptional" : false
              }
            }
          },
          "struct" : {
            "schema" : {
              "name" : "Address",
              "type" : "STRUCT",
              "isOptional" : false,
              "fieldSchemas" : {
                "city" : {
                  "type" : "STRING",
                  "isOptional" : false
                },
                "state" : {
                  "type" : "STRING",
                  "isOptional" : false
                }
              }
            },
            "fieldValues" : [ {
              "name" : "city",
              "schema" : {
                "type" : "STRING",
                "isOptional" : false
              },
              "storage" : "Austin"
            }, {
              "name" : "state",
              "schema" : {
                "type" : "STRING",
                "isOptional" : false
              },
              "storage" : "tx"
            } ]
          }
        } ]
      },
      "timestampType" : "NO_TIMESTAMP_TYPE",
      "offset" : 1,
      "headers" : [ ]
    }

Change(s) in the output are emphasized if delta(s) are detected.

.. code-block:: json
    :caption: Output
    :emphasize-lines: 30, 31, 32, 33, 64, 65, 66, 67, 134, 135, 136, 137, 138, 139, 140

    {
      "topic" : "topic",
      "kafkaPartition" : 1,
      "valueSchema" : {
        "type" : "STRUCT",
        "isOptional" : false,
        "fieldSchemas" : {
          "first_name" : {
            "type" : "STRING",
            "isOptional" : false
          },
          "last_name" : {
            "type" : "STRING",
            "isOptional" : false
          },
          "address" : {
            "name" : "Address",
            "type" : "STRUCT",
            "isOptional" : false,
            "fieldSchemas" : {
              "city" : {
                "type" : "STRING",
                "isOptional" : false
              },
              "state" : {
                "type" : "STRING",
                "isOptional" : false
              }
            }
          },
          "state" : {
            "type" : "STRING",
            "isOptional" : false
          }
        }
      },
      "value" : {
        "schema" : {
          "type" : "STRUCT",
          "isOptional" : false,
          "fieldSchemas" : {
            "first_name" : {
              "type" : "STRING",
              "isOptional" : false
            },
            "last_name" : {
              "type" : "STRING",
              "isOptional" : false
            },
            "address" : {
              "name" : "Address",
              "type" : "STRUCT",
              "isOptional" : false,
              "fieldSchemas" : {
                "city" : {
                  "type" : "STRING",
                  "isOptional" : false
                },
                "state" : {
                  "type" : "STRING",
                  "isOptional" : false
                }
              }
            },
            "state" : {
              "type" : "STRING",
              "isOptional" : false
            }
          }
        },
        "fieldValues" : [ {
          "name" : "first_name",
          "schema" : {
            "type" : "STRING",
            "isOptional" : false
          },
          "storage" : "test"
        }, {
          "name" : "last_name",
          "schema" : {
            "type" : "STRING",
            "isOptional" : false
          },
          "storage" : "developer"
        }, {
          "name" : "address",
          "schema" : {
            "name" : "Address",
            "type" : "STRUCT",
            "isOptional" : false,
            "fieldSchemas" : {
              "city" : {
                "type" : "STRING",
                "isOptional" : false
              },
              "state" : {
                "type" : "STRING",
                "isOptional" : false
              }
            }
          },
          "struct" : {
            "schema" : {
              "name" : "Address",
              "type" : "STRUCT",
              "isOptional" : false,
              "fieldSchemas" : {
                "city" : {
                  "type" : "STRING",
                  "isOptional" : false
                },
                "state" : {
                  "type" : "STRING",
                  "isOptional" : false
                }
              }
            },
            "fieldValues" : [ {
              "name" : "city",
              "schema" : {
                "type" : "STRING",
                "isOptional" : false
              },
              "storage" : "Austin"
            }, {
              "name" : "state",
              "schema" : {
                "type" : "STRING",
                "isOptional" : false
              },
              "storage" : "tx"
            } ]
          }
        }, {
          "name" : "state",
          "schema" : {
            "type" : "STRING",
            "isOptional" : false
          },
          "storage" : "tx"
        } ]
      },
      "timestampType" : "NO_TIMESTAMP_TYPE",
      "offset" : 1,
      "headers" : [ ]
    }