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ABENCDS_PV_ASSOC_REDIRECTED - CDS PV ASSOC REDIRECTED

ABENCDS_PV_ASSOC_REDIRECTED - CDS PV ASSOC REDIRECTED

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- redirected, Transactional Query

... REDIRECTED TO proj_view
  $| REDIRECTED TO COMPOSITION CHILD proj_view
  $| REDIRECTED TO PARENT proj_view

Variants:

1. ... REDIRECTED TO proj_view

2. ... REDIRECTED TO COMPOSITION CHILD proj view

3. ... REDIRECTED TO PARENT proj view

Effect

Redirects a CDS association, a CDS composition, or a CDS to-parent association of the projected entity in a CDS projection view to a new association target. As a prerequisite, the original association target must also have a CDS projection view. Redirection using the keyword REDIRECTED TO $[...$] means to direct an association to a new association target, which is also a CDS projection view, in this way moving the complete data model to the projection layer.

With redirection, a specialized CDS association can lose its specialization and become a simple CDS association. This means that you can redirect a CDS composition or a CDS to-parent association with the keyword REDIRECTED TO and then it is exposed as a simple CDS association. The other way around is not possible - a simple CDS association cannot be specialized. Thus, you cannot use the addition REDIRECTED TO COMPOSITION CHILD or REDIRECTED TO PARENT to redirect a simple CDS association.

Example

The projection view DEMO_SALES_PV_SO is based on the CDS view DEMO_SALES_CDS_SO. It replaces the association targets of the associations with other CDS projection views where required.

The executable example Exposing Associations accesses the CDS projection view shown above, reads all fields and returns the result.



Variant 1

... REDIRECTED TO proj_view


Effect

Redirects a CDS association exposed in a CDS projection view to a new association target.

The following applies to the redirection of a CDS association:

  • Can be used to redirect simple CDS associations, CDS compositions, or to-parent associations.
When the keyword REDIRECTED TO is used on specialized CDS associations (CDS compositions or CDS to-parent associations), they become non-specialized and are handled as CDS associations. Compositions and to-parent associations which are projected in this way never define compositions and to-parent associations in the projection view.
  • The target of the redirection proj_view must be a projection view based on the original target of the association.
  • The target of the redirection proj_view can be the CDS projection view proj_view itself only if the projected CDS association is a self association.
  • The target of the redirection REDIRECTED TO cannot be specified using a path expression.
  • The CDS projection view proj_view can be used multiple times as the redirection target of the projected CDS associations in the CDS projection view proj_view. The following syntax is valid:
_Assoc1: REDIRECTED TO proj_view,
_Assoc2: REDIRECTED TO proj_view

Variant 2

... REDIRECTED TO COMPOSITION CHILD proj_view


Effect

Redirects a CDS composition exposed in a CDS projection view to a new association target. With the addition REDIRECTED TO COMPOSITION CHILD, the special characteristics of a CDS composition are kept.

The following applies to the redirection of a CDS composition:

  • The CDS association redirected using the addition REDIRECTED TO COMPOSITION CHILD must be a CDS composition.
  • The target of the redirection REDIRECTED TO COMPOSITION CHILD must be the projection of the original target of the association. Therefore, the target cannot be a root projection view.
  • The target of the redirection REDIRECTED TO COMPOSITION CHILD cannot be specified using a path expression.
  • The target of REDIRECTED TO COMPOSITION CHILD cannot be the CDS projection view proj_view itself. A self association is not possible.
  • The redirection target proj_view must project exactly one to-parent association to its composition parent. This to-parent association must exist before the composition can be projected in the projection view.
  • The redirection target proj_view can be used only once in a CDS composition and multiple times in CDS associations. This is demonstrated in the following simplified example:
  • This is valid

_Assoc1: REDIRECTED TO COMPOSITION CHILD proj_view,
_Assoc2: REDIRECTED TO proj_view
  • This is not valid

_Assoc1: REDIRECTED TO COMPOSITION CHILD proj_view,
_Assoc2: REDIRECTED TO PARENT$|${COMPOSITION CHILD$} proj_view

Variant 3

... REDIRECTED TO PARENT proj_view


Effect

Redirects a to-parent association in a CDS projection view to a new association target. With the addition REDIRECTED TO PARENT, the special characteristics of a CDS to-parent association are kept.

The following applies to the redirection of a CDS to-parent association:

  • The CDS association to_parent_assoc projected with this syntax must be defined as a CDS to-parent association in the underlying CDS view.
  • The target of the redirection REDIRECTED TO PARENT should be the projection of the original target of the to-parent association.
  • The target of the redirection REDIRECTED TO PARENT cannot be specified using a path expression.
  • The addition REDIRECTED TO PARENT can be used no more than once in the definition of a CDS projection view. This means that a CDS projection view can have no more than one parent entity.
  • The redirection target cannot be the CDS projection view proj_view itself. A self association is not possible.
  • The redirection target proj_view can be used only once in a CDS to-parent association and multiple times in CDS associations. This is demonstrated in the following simplified example:
  • This is valid

_Assoc1: REDIRECTED TO PARENT proj_view,
_Assoc2: REDIRECTED TO proj_view
  • This is not valid

_Assoc1: REDIRECTED TO PARENT proj_view,
_Assoc2: REDIRECTED TO PARENT$|${COMPOSITION CHILD$} proj_view






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