Add decimal field support to field factory service.

docs/development/module/services.md

@@ -120,6 +120,11 @@ Both methods expect an array of field definition options. These include:
 - `type` (required) - The field data type. Each type may require additional
   options. Supported types include:
     - `boolean` - True/false checkbox.
+    - `decimal` - Decimal number with fixed precision. Additional options:
+        - `precision` (optional) - Total number of digits (including after the
+          decimal point). Defaults to 10.
+        - `scale` (optional) - Number digits to the right of the decimal point.
+          Defaults to 2.
     - `entity_reference` - Reference other entities. Additional options:
         - `target_type` (required) - The entity type to reference (eg: `asset`,
           `log`, `plan`)

modules/core/field/src/FarmFieldFactory.php

@@ -116,6 +116,10 @@ protected function buildFieldDefinition(BaseFieldDefinition &$field, array $opti
         $this->modifyBooleanField($field, $options);
         break;
 
+      case 'decimal':
+        $this->modifyDecimalField($field, $options);
+        break;
+
       case 'entity_reference':
         $this->modifyEntityReferenceField($field, $options);
         break;
@@ -234,6 +238,40 @@ protected function modifyBooleanField(BaseFieldDefinition &$field, array $option
     ]);
   }
 
+  /**
+   * Decimal field modifier.
+   *
+   * @param \Drupal\Core\Field\BaseFieldDefinition &$field
+   *   A base field definition object.
+   * @param array $options
+   *   An array of options.
+   */
+  protected function modifyDecimalField(BaseFieldDefinition &$field, array $options = []) {
+
+    // Set the precision and scale, if specified.
+    if (!empty($options['precision'])) {
+      $field->setSetting('precision', $options['precision']);
+    }
+    if (!empty($options['scale'])) {
+      $field->setSetting('scale', $options['scale']);
+    }
+
+    // Build form and view display settings.
+    $field->setDisplayOptions('form', [
+      'type' => 'number',
+      'weight' => $options['weight']['form'] ?? 0,
+    ]);
+    $view_display_options = [
+      'label' => 'inline',
+      'type' => 'number_decimal',
+      'weight' => $options['weight']['view'] ?? 0,
+    ];
+    if (!empty($options['scale'])) {
+      $view_display_options['settings']['scale'] = $options['scale'];
+    }
+    $field->setDisplayOptions('view', $view_display_options);
+  }
+
   /**
    * Entity reference field modifier.
    *