metaaddfield

Add a column to the data extract containing selected data from the metaheader.

Introduction

Use the metaaddfield instruction to add a metadata from a data extract into the rows of your data extract table.

Creating a custom script transformation using the metaaddfield instruction

To create and configure a custom script using the metaaddfield instruction, follow these steps:

1. Create a custom script transformation.

2. In the Configuration step, select the metaaddfield instruction.

3. To configure the custom script instruction, fill in the required fields below, as well as any optional fields you require:

Field name (required)

Specify the name of the new column to add to the data extract.

Meta name (required)

Enter the name of the source field in the header that contains the metadata to add to the data extract. If the metadata is nested in a dictionary, you can navigate to the values using . separated field names. An example of navigating nested values is shown in Example 2.

Index (required)

Specify where to add the new column in the data extract. To add the column to the first position, specify 0. To add the column to the last position, specify -1.

Subtable

Enter the name for a subtable that you want to use within this custom script.

A subtable is a temporary table that only exists for this custom script. You can apply additional instructions within the same custom script to the subtable. However, the subtable cannot be used in any other custom scripts.

If a subtable does not exist for the current custom script, the transformation is applied to the data extract, and the enriched data is output into the subtable. If the subtable already exists for the custom script, the subtable is used as the input for the transformation and optionally as the output.

Example 1

This example is searching for the simple, non-nested metadata of datastream_extract_id.

Transformation configuration

Fieldname*

Metadata

Metaname

datastream_extract_id

Index

2

Data table before transformation

Campaign	Ad Group	Clicks
Brand	media	7
Brand	ecommerce	3
Dashboard	media|social	18

Data table after transformation

Campaign	Ad Group	Metadata	Clicks
Brand	media	1234	7
Brand	ecommerce	1234	3
Dashboard	media|social	1234	18

Example 2

This example is searching for the nested metadata {"custom_meta_information":{"source_directory":"uploads"}}.

Transformation configuration

Fieldname*

Metadata

Metaname

custom_meta_information.source_directory

Index

2

Data table before transformation

Campaign	Ad Group	Clicks
Brand	media	7
Brand	ecommerce	3
Dashboard	media|social	18

Data table after transformation

Campaign	Ad Group	Metadata	Clicks
Brand	media	uploads	7
Brand	ecommerce	uploads	3
Dashboard	media|social	uploads	18