SAP Developer Challenge - SAP Cloud Application Programming Model (Week 1)

[nicoschoenteich]

Please note that this challenge is closed. The deadline for receiving a badge upon successful completion has passed. Check out this new challenge for the month of August.

Welcome to the first week of this month's SAP Developer Challenge. This week we are going to learn how to get started with the SAP Cloud Application Programming Model (CAP) and domain modeling. If you haven't read the announcement blog post for this challenge, please head over and do so.

The Challenge

The objective this week is to build a CAP service, that can track golf rounds. Yes, you read that right – golf rounds ⛳️🏌🏽‍. This is a completely artificial scenario that we made up, but it lends itself pretty well to practice a few basic CAP features.

We have prepared a starter project (link to CodeSandbox below) that already contains the entity "Rounds" and exposes it via a service. It is your job to enrich this existing service.

This is what you have to do to successfully complete this week's challenge:

1.  Go to the CodeSandbox and fork it. You have to have an account with CodeSandbox and be be signed in to be able to do that.
2. Work on the project so it represents the following relationships:
   1. The service should track who entered a new round and when it was entered (hint: managed entities).
   2. A round consists of multiple holes. No hole can exists without its "parent" round (hint: compositions vs. associations).
   3. Each hole has a score, representing the number of shots it took a player to get the ball into the hole.
   4. Similarly, each hole has a par of 3, 4, or 5, representing the average amount of shots it takes a professional golfer to get the ball into the hole.
   5. Each hole consists of one or more shots. Similar to rounds and holes, no shot can exists without its "parent" hole (hint: compositions vs. associations).
   6. (Feel free to add more fields to the entities as you see fit.)
3. Run the dev server using the predefined "dev" task. To do so, click on the little plus icon (+) to open the dev tools and click on "Tasks > dev".
4. Wait for the server to start. Once done, click on "http://localhost:4004".
5. Open the metadata of the "browse" service.
6. Take a screen shot of the metadata and post it into this discussion thread. Hopefully it looks something like this (a few sections collapsed in the screen shot):

Resources

We have gathered a few helpful resources to get started. Also make sure to inspect the existing code in the starter project and try to understand what it does.

- Jumpstart CAP projects

- Domain modeling

- Core Data Services (CDS)

- Managed entities

- Compositions

- Compositions vs. associations

- SAP CAP Introduction by Thomas Jung (SAP CodeJam) 

Note: If you encounter issues with your dev server not starting properly, check your cds syntax. Unfortunately, the CodeSandbox doesn't have syntax highlighting for cds and it may not provide clear error messages. One useful approach is to comment out sections of code until the server starts, then gradually uncomment to isolate the problematic line.

Good luck and happy learning!

[GRABLERE]

@nicoschoenteich Thanks for this month challenge:)

[nicoschoenteich]

Well done ✅

[Tobias_Berger]

[nicoschoenteich]

Well done ✅ Does Rounds have a composition of many Holes?

[Tobias_Berger]

Indeed forgot this one. 

Thanks a lot for checking!

[satya-dev]

done!!

[nicoschoenteich]

Well done ✅

[MioYasutake]

My week 1 submission

[nicoschoenteich]

Well done ✅

[MarcelloUrbani]

This XML file does not appear to have any style information associated with it. The document tree is shown below.
<edmx:Edmx xmlns:edmx="http://docs.oasis-open.org/odata/ns/edmx" Version="4.0">
<edmx:Reference Uri="https://sap.github.io/odata-vocabularies/vocabularies/Common.xml">
<edmx:Include Alias="Common" Namespace="com.sap.vocabularies.Common.v1"/>
</edmx:Reference>
<edmx:Reference Uri="https://oasis-tcs.github.io/odata-vocabularies/vocabularies/Org.OData.Core.V1.xml">
<edmx:Include Alias="Core" Namespace="Org.OData.Core.V1"/>
</edmx:Reference>
<edmx:Reference Uri="https://sap.github.io/odata-vocabularies/vocabularies/UI.xml">
<edmx:Include Alias="UI" Namespace="com.sap.vocabularies.UI.v1"/>
</edmx:Reference>
<edmx:DataServices>
<Schema xmlns="http://docs.oasis-open.org/odata/ns/edm" Namespace="CatalogService">
<EntityContainer Name="EntityContainer">
<EntitySet Name="Rounds" EntityType="CatalogService.Rounds">
<NavigationPropertyBinding Path="holes" Target="Holes"/>
</EntitySet>
<EntitySet Name="Holes" EntityType="CatalogService.Holes">
<NavigationPropertyBinding Path="round" Target="Rounds"/>
<NavigationPropertyBinding Path="shots" Target="Shots"/>
</EntitySet>
<EntitySet Name="Shots" EntityType="CatalogService.Shots">
<NavigationPropertyBinding Path="hole" Target="Holes"/>
</EntitySet>
</EntityContainer>
<EntityType Name="Rounds">
<Key>
<PropertyRef Name="ID"/>
</Key>
<Property Name="createdAt" Type="Edm.DateTimeOffset" Precision="7"/>
<Property Name="createdBy" Type="Edm.String" MaxLength="255"/>
<Property Name="modifiedAt" Type="Edm.DateTimeOffset" Precision="7"/>
<Property Name="modifiedBy" Type="Edm.String" MaxLength="255"/>
<Property Name="ID" Type="Edm.Guid" Nullable="false"/>
<Property Name="title" Type="Edm.String" MaxLength="111"/>
<NavigationProperty Name="holes" Type="Collection(CatalogService.Holes)" Partner="round">
<OnDelete Action="Cascade"/>
</NavigationProperty>
</EntityType>
<EntityType Name="Holes">
<Key>
<PropertyRef Name="pos"/>
<PropertyRef Name="round_ID"/>
</Key>
<Property Name="pos" Type="Edm.Int32" Nullable="false"/>
<NavigationProperty Name="round" Type="CatalogService.Rounds" Partner="holes">
<ReferentialConstraint Property="round_ID" ReferencedProperty="ID"/>
</NavigationProperty>
<Property Name="round_ID" Type="Edm.Guid" Nullable="false"/>
<Property Name="score" Type="Edm.Int32"/>
<Property Name="par" Type="Edm.Int32"/>
<NavigationProperty Name="shots" Type="Collection(CatalogService.Shots)" Partner="hole">
<OnDelete Action="Cascade"/>
</NavigationProperty>
</EntityType>
<EntityType Name="Shots">
<Key>
<PropertyRef Name="pos"/>
<PropertyRef Name="hole_pos"/>
<PropertyRef Name="hole_round_ID"/>
</Key>
<Property Name="pos" Type="Edm.Int32" Nullable="false"/>
<NavigationProperty Name="hole" Type="CatalogService.Holes" Partner="shots">
<ReferentialConstraint Property="hole_pos" ReferencedProperty="pos"/>
<ReferentialConstraint Property="hole_round_ID" ReferencedProperty="round_ID"/>
</NavigationProperty>
<Property Name="hole_pos" Type="Edm.Int32" Nullable="false"/>
<Property Name="hole_round_ID" Type="Edm.Guid" Nullable="false"/>
<Property Name="length" Type="Edm.Double"/>
</EntityType>
<Annotations Target="CatalogService.Rounds/createdAt">
<Annotation Term="UI.HiddenFilter" Bool="true"/>
<Annotation Term="Core.Immutable" Bool="true"/>
<Annotation Term="Core.Computed" Bool="true"/>
<Annotation Term="Common.Label" String="Created On"/>
</Annotations>
<Annotations Target="CatalogService.Rounds/createdBy">
<Annotation Term="UI.HiddenFilter" Bool="true"/>
<Annotation Term="Core.Immutable" Bool="true"/>
<Annotation Term="Core.Computed" Bool="true"/>
<Annotation Term="Core.Description" String="User's unique ID"/>
<Annotation Term="Common.Label" String="Created By"/>
</Annotations>
<Annotations Target="CatalogService.Rounds/modifiedAt">
<Annotation Term="UI.HiddenFilter" Bool="true"/>
<Annotation Term="Core.Computed" Bool="true"/>
<Annotation Term="Common.Label" String="Changed On"/>
</Annotations>
<Annotations Target="CatalogService.Rounds/modifiedBy">
<Annotation Term="UI.HiddenFilter" Bool="true"/>
<Annotation Term="Core.Computed" Bool="true"/>
<Annotation Term="Core.Description" String="User's unique ID"/>
<Annotation Term="Common.Label" String="Changed By"/>
</Annotations>
</Schema>
</edmx:DataServices>
</edmx:Edmx>

[nicoschoenteich]

Well done ✅

[hcordeiro]

Is it right?

[nicoschoenteich]

Well done ✅

[VijayCR]

Hello @nicoschoenteich - Week 1 challenge completed, Could you check ?

[nicoschoenteich]

Well done ✅

[Ruthiel]

Hello Nico!

Thanks for this challenge:

[nicoschoenteich]

Well done ✅

Does Shots have an association back to a hole?

[HappyGirl]

My submission for week 1

[nicoschoenteich]

Well done ✅

[geek]

Late to the party...

[nicoschoenteich]

Well done ✅ 

Better late than never 😉

[jschallenberger]

Just in time
Git Repo 

[nicoschoenteich]

Well done ✅

[dinah]

My submission:

[nicoschoenteich]

Well done Dinah ✅

[andrew_mak]

Hello Nico,

Thanks for the challenge!

[nicoschoenteich]

Well done ✅

[antothomasraja]

Hi @nicoschoenteich

Below is my submission for Week 1,

Thank you!

[nicoschoenteich]

Well done ✅

[steph_senita]

Hi @nicoschoenteich , 

Please find below my submission for Week1

Thanks & regards

Stephanie

[nicoschoenteich]

Well done ✅

[VenugopalA]

Hi @nicoschoenteich ,

week one task,

thank you.

[nicoschoenteich]

Well done ✅

[Ashok459]

Hello,

My submission for week 1

[nicoschoenteich]

Well done ✅

[Geeth]

Hi Nicolai,

Please find the screenshot

[nicoschoenteich]

Well done ✅

[Cmdd]

Hi! This is my approach using managed composition of aspects

[nicoschoenteich]

Well done ✅

[harsh_itaverma]

I hope its not too late 🙂