RAP 6: ETag

•  In this post show will work with Etag in RAP.
• ETag with Manage Application
• Step 1: If you don't have timestamp  field in your custom table then kinldy created timestamp field 
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• Step 2: Add created timestamp field into your Interface view with annotation
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• Interface view Code:

• @AccessControl.authorizationCheck: #NOT_REQUIRED

  @EndUserText.label: 'Root View for Sales order Head'

  @Metadata.ignorePropagatedAnnotations: true

  define root view entity ZR_SALESORDER_HEAD_M

  as select from zms_sales_head as Head

  composition [0..*] of ZI_SALESORDER_ITEM_M as _Item

  {

  key vbeln as SalesOrder,

  audat as DocumentDate,

  auart as OrderType,

  vkorg as SalesOrganization,

  vtweg as DistributionChannel,

  spart as Division,

  erdat as Erdat,

  erzet as Erzet,

  @Semantics.user.localInstanceLastChangedBy: true

  ernam as Ernam,

  @Semantics.systemDateTime.localInstanceLastChangedAt: true

  lastchanged as LastChangedAt,

  _Item

  }

• Step 3: Add timestamp field into the Projection view
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• Projection view code:

• @AccessControl.authorizationCheck: #NOT_REQUIRED

  @EndUserText.label: 'ProjectionView for Sales order Header'

  @Metadata.ignorePropagatedAnnotations: true

  @Metadata.allowExtensions: true

  define root view entity ZC_SALESORDER_HEAD_M

  provider contract transactional_query

  as projection on ZR_SALESORDER_HEAD_M

  {

  key SalesOrder,

  DocumentDate,

  OrderType,

  SalesOrganization,

  DistributionChannel,

  Division,

  Erdat,

  Erzet,

  Ernam,

  LastChangedAt,

  _Item : redirected to composition child ZC_SALESORDER_ITEM_M

  }

• Step 4: Add etag to your Interface behavior definition, when we define etage for the perticular field then alway make that field in read only.
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• Interface behavior definition code

• managed implementation in class zbp_r_salesorder_head_m unique;

  strict ( 2 );

  
  

  define behavior for ZR_SALESORDER_HEAD_M alias Header

  persistent table zms_sales_head

  lock master

  authorization master ( instance )

  etag master LastChangedAt

  {

  create ( authorization : global );

  update;

  delete;

  field ( readonly ) SalesOrder, Ernam, LastChangedAt;

  association _Item { create; }

  mapping for zms_sales_head //db table name

  {

  
  

  //CDS View field //DB Table field name

  SalesOrder = vbeln;

  DocumentDate = audat;

  OrderType = auart;

  SalesOrganization = vkorg;

  DistributionChannel = vtweg;

  Division = spart;

  Erdat = erdat;

  Erzet = erzet;

  Ernam = ernam;

  LastChangedAt = lastchanged;

  }

  }

  define behavior for ZI_SALESORDER_ITEM_M alias Item

  persistent table zms_sales_item

  lock dependent by _Head

  authorization dependent by _Head

  etag dependent by _Head

  {

  update;

  delete;

  field ( readonly ) SalesOrder, Item;

  
  

  association _Head;

  mapping for zms_sales_item //db table name

  {

  
  

  //CDS View field //DB Table field name

  SalesOrder = vbeln;

  Item = posnr;

  Material = matnr;

  MaterialDescription = arktx;

  Quantity = kwmeng;

  Unit = vrkme;

  Netpr = netpr;

  Currency = waerk;

  }

  }

• Step5: Add etage in Projection behavior
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• Projection Behavior definition code

• projection;

  strict ( 2 );

  
  

  define behavior for ZC_SALESORDER_HEAD_M alias Header

  use etag

  {

  use create;

  use update;

  use delete;

  use association _Item { create; }

  }

  
  

  define behavior for ZC_SALESORDER_ITEM_M alias Item

  use etag

  {

  use update;

  use delete;

  
  

  use association _Head;

  }

• ETag with Unmanage Application => Comming soon