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  1. OASIS Open Data Protocol (OData) TC
  2. ODATA-1441

New query option $expect combining $expand and $select

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    Details

    • Type: Improvement
    • Status: New
    • Priority: Major
    • Resolution: Unresolved
    • Affects Version/s: V4.01_OS
    • Fix Version/s: V4.02, V5.0
    • Component/s: URL Conventions
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      Proposed

    • Proposal:
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      Introduce a new query option $expect that combines the functionality of $expand and $select in a simplified syntax, inspired by the field list structure used in the context URL. In the simplest form it is just a nested list of fields, with primitive properties as "leafs" and (single- or collection-valued) complex/navigation properties suffixed with parentheses including the field list for their properties, recursively:

      $expect=a,b(c,d,e(f,g),h),i

      Query options other than $expect, $expand and $select can be mixed in with the field lists:

      $expect=a,b(c,d,e(f,g,filter=f eq 3),h,top=5,skip=100),i
      Show
      Introduce a new query option $expect that combines the functionality of $expand and $select in a simplified syntax, inspired by the field list structure used in the context URL. In the simplest form it is just a nested list of fields, with primitive properties as "leafs" and (single- or collection-valued) complex/navigation properties suffixed with parentheses including the field list for their properties, recursively: $expect=a,b(c,d,e(f,g),h),i Query options other than $expect, $expand and $select can be mixed in with the field lists: $expect=a,b(c,d,e(f,g,filter=f eq 3),h,top=5,skip=100),i

      Description

      Both $expand and $select shape the response, but preserve in query syntax the differentiation between "structural" and "navigation" properties.

      From a pure response shape perspective this differentiation has become less relevant over the last OData increments, supporting paging for all collections, indexing for all ordered collections, and field selection on all structured response parts.

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            • Assignee:
              Unassigned
              Reporter:
              handl Ralf Handl
            • Watchers:
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              Dates

              • Created:
                Updated: