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Core doesn't generate the "delta" field for base fields, so we'll have to do it in ReferenceViewsData.
Matching core issue:
#3097568: EntityViewsData does not generate a "additional fields" nor "delta" field for multivalue base fields →
Seeing that the Commerce Core and Entity API modules have already presented this problem, I suggest following your correction approach.
Commerce Core:
#3097586: Multivalue base fields are missing the "delta" views field →
Entity API:
#3116128: Add an EntityViewsData handler for improved Views integration →
Add the delta if it is a multiple field in ReferenceViewsData.
protected function mapFieldDefinition($table, $field_name, FieldDefinitionInterface $field_definition, TableMappingInterface $table_mapping, &$table_data) {
parent::mapFieldDefinition($table, $field_name, $field_definition, $table_mapping, $table_data);
if ($this->getFieldStorageDefinitions()[$field_name]->isMultiple()) {
$label = $field_definition->getLabel();
$table_data['delta'] = [
'title' => $this->t('@label (@name:delta)', ['@label' => $label, '@name' => $field_name]),
'title short' => t('@label:delta', ['@label' => $label]),
];
...
}
Review of the proposed solution.
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Fixed
3.0
Code
Automatically closed - issue fixed for 2 weeks with no activity.