Getting Started

Entity Books:

• has element enum with @assert.range enum { F; B; };
• has element author with association to Authors
• Authors has only one record with ID = 1

Function hello implemented in world.js do:

    const Books = cds.entities.Books;

    await tx.create(Books).entries({
        enum: "T",
        author_ID: req.data.author,
    });

cds -v:

@sap/cds: 4.3.0
@sap/cds-compiler: 1.45.0
@sap/cds-dk: 3.1.4
@sap/cds-foss: 2.2.0
@sap/cds-reflect: 2.13.3
@sap/cds-runtime: 2.6.0
Node.js: v12.16.3

Tests

1° oData, not existing Author

Run Test 1° in test.http:

POST http://localhost:4004/Catalog/Books HTTP/1.1
Content-Type: application/json

{
    "enum": "B",
    "author_ID": 2
}

Result is:

{
  "error": {
    "code": "400",
    "message": "Reference integrity is violated for association \"author\"",
    "target": "CatalogService.Authors",
    "@Common.numericSeverity": 4
  }
}

2° oData, not valid enum

Run Test 2° in test.http

POST http://localhost:4004/Catalog/Books HTTP/1.1
Content-Type: application/json

{
    "enum": "T",
    "author_ID": 1
}

Result is:

{
  "error": {
    "code": "400",
    "message": "Value of element \"enum\" is invalid according to enum declaration",
    "target": "enum",
    "@Common.numericSeverity": 4
  }
}

3° tx.create(Books), not existing Author

Call:

http://localhost:4004/say/hello(author='2')

Result is:

<error xmlns="http://docs.oasis-open.org/odata/ns/metadata">
    <code>400</code>
        <message>Multiple errors occurred. Please see the details for more information.</message>
        <details>
            <detail>
                <code>400</code>
                <message>Reference integrity is violated for association "author"</message>
                <target>my.bookshop.Authors</target>
                <annotation term="Common.numericSeverity" type="Edm.Decimal">4</annotation>
            </detail>
            <detail>
                <code>400</code>
                <message>Reference integrity is violated for association "author"</message>
                <target>my.bookshop.Authors</target>
                <annotation term="Common.numericSeverity" type="Edm.Decimal">4</annotation>
                </detail>
        </details>
</error>

4° tx create(Books), not valid enum

Call:

http://localhost:4004/say/hello(author='1')

Result is:

{
  "@odata.context": "$metadata#Edm.String",
  "value": "OK"
}