Add key atribute to cds.Decimal (#106)

Signed-off-by: Simon Heimler <simon.heimler@sap.com>

Author: Fannon

CHANGELOG.md

@@ -10,6 +10,10 @@ For a roadmap including expected timeline, please refer to [ROADMAP.md](./ROADMA
 
 ## [unreleased]
 
+### Added
+
+- Allow `cds.Decimal` to be used as a key, indicated via `key` boolean
+
 ## [1.0.6]
 
 ### Added

spec/v1/CSN-Interop-Effective.schema.yaml

@@ -838,7 +838,7 @@ definitions:
         const: cds.Decimal
         description: The modeling artefact is a `cds.Decimal` type.
         tsType: DecimalCdsType
-      # key: *elementKey
+      key: *elementKey
       notNull: *elementNotNull
       doc: *doc
       default:

src/generated/spec-v1/schemas/csn-interop-effective.schema.json

@@ -1824,6 +1824,10 @@
           "description": "The modeling artefact is a `cds.Decimal` type.",
           "tsType": "DecimalCdsType"
         },
+        "key": {
+          "type": "boolean",
+          "description": "Indicates that this element is used as a primary key.\nMultiple primary keys MAY be used in case of a composite ID.\n\nElements marked as `key` also imply `notNull: true`."
+        },
         "notNull": {
           "type": "boolean",
           "description": "Indicates that this element does not accept NULL values, which means that you cannot insert or update a record without adding a value to this field.\n\nElements marked as `key: true` also imply `notNull: true`."

src/generated/spec-v1/types/csn-interop-effective.ts

@@ -1441,6 +1441,13 @@ export interface DecimalType {
    * The modeling artefact is a `cds.Decimal` type.
    */
   type: DecimalCdsType;
+  /**
+   * Indicates that this element is used as a primary key.
+   * Multiple primary keys MAY be used in case of a composite ID.
+   *
+   * Elements marked as `key` also imply `notNull: true`.
+   */
+  key?: boolean;
   /**
    * Indicates that this element does not accept NULL values, which means that you cannot insert or update a record without adding a value to this field.
    *