January 2024 – AgileAdam.com

UPDATE. You can do the same as below without the need for a custom module function. (source)

  field_address_full:
      - plugin: callback
        callable: array_filter
        source:
          - address_1
          - city
          - state
      - plugin: concat
        delimiter: ', '

field_address_full:

- plugin: callback

callable: array_filter

source:

- address_1

- city

- state

- plugin: concat

delimiter: ', '

This quick example shows one method to ignore empty values in a Drupal 10 migration concatenate process.

Code

Migrate code:

process:
  temp_address_parts:
    -
      plugin: skip_on_empty
      method: process
      source:
        - address_1
        - city
        - state
    -
      plugin: callback
      callable: mymodule_migrate_filter_empty
  field_address_full:
    plugin: concat
    delimiter: ', '
    source: '@temp_address_parts'

process:

temp_address_parts:

plugin: skip_on_empty

method: process

source:

- address_1

- city

- state

plugin: callback

callable: mymodule_migrate_filter_empty

field_address_full:

plugin: concat

delimiter: ', '

source: '@temp_address_parts'

Module code:

/**
 * Filters out empty values from an array.
 */
function mymodule_migrate_filter_empty($values): array {
  return array_filter($values, function ($value) {
    return !empty($value);
  });
}

/**

* Filters out empty values from an array.

function mymodule_migrate_filter_empty($values): array {

return array_filter($values, function ($value) {

return !empty($value);

});

}

Result

Example data:

address_1,city,state
1 Main St.,Portland,ME
2 Main St.,Portland
,Portland,ME

address_1,city,state

1 Main St.,Portland,ME

2 Main St.,Portland

,Portland,ME

Resulting field_address_full plain text value

1 Main St., Portland, ME
1 Main St., Portland
Portland, ME

1 Main St., Portland, ME

1 Main St., Portland

Portland, ME