API Gateway model

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{{container}}{{container layoutStyle="columns"}}(((

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In this microlearning, we will focus on learning about the API Data model.

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As with every integration pattern eMagiz gives you the option to create your data model.

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This data model can be based on standards (i.e. OTM5), can be custom made, or a combination of both.

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For API, the data model represents the structure of messages that you want to publish to the outside (other parties or other internal systems) world.

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Should you have any questions, please contact [[academy@emagiz.com>>mailto:academy@emagiz.com]].

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== 1. Prerequisites ==

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* Basic knowledge of the eMagiz platform

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== 2. Key concepts ==

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This microlearning centers around the API Data Model.

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With API we mean: A collection of definitions based on which a client can communicate with applications.

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With a data model we mean: A collection of elements (entities and attributes) that represent how you view those elements and how you want to converse about those elements.

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The data model consists of the following:

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* Entities with their characteristics

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* Relationships between entities

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And has as a goal to create a landscape-wide overview of the collection of elements that are integrated via the eMagiz platform.

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== 3. API Data Model ==

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As with every integration pattern eMagiz gives you the option to create your data model.

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This data model can be based on standards (i.e. OTM5), can be custom made, or a combination of both.

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For API the data model represents the structure of messages that you want to publish to the outside (other parties or other internal systems) world.

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You can access the API data model in the Design phase of eMagiz. To do so you have to navigate to Design and open the context menu on the API block in the center of your Design Overview.

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[[image:Main.Images.Microlearning.WebHome@crashcourse-api-gateway-api-data-model--access-data-model-in-design.png]]

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When you select this option eMagiz will take you to the Gateway (API) Data Model.

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When you enter this overview for the first time you will see an empty canvas.

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[[image:Main.Images.Microlearning.WebHome@crashcourse-api-gateway-api-data-model--data-model-in-design-empty.png]]

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On this canvas, you can either drag and drop items (just as we discussed in our Crash Course Platform * Creating a Message Definition)

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or you can opt to Import from an XSD file. In either case, you need to enter "Start Editing" mode first.

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[[image:Main.Images.Microlearning.WebHome@crashcourse-api-gateway-api-data-model--import-data-model-in-design.png]]

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You can also import part of the data model and extend it further with the help of manual editing or importing a second part of the data model later on as the model grows.

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So, for example your data model could look like this after you have imported two separate XSD files into the API Gateway Data Model:

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[[image:Main.Images.Microlearning.WebHome@crashcourse-api-gateway-api-data-model--import-data-model-in-design-filled-in.png]]

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=== 3.1 Saving your changes ===

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After you are done with editing on this data model you can press "Stop Editing" and you will be presented with the following pop-up:

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[[image:Main.Images.Microlearning.WebHome@crashcourse-api-gateway-api-data-model--create-new-version-pop-up.png]]

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At this point, you have to make a choice. If you are satisfied with your work you press Save and create a new version.

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If you are unsure of your work or simply need to stop because there is no more time left go for the option Save and continue.

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==== 3.1.1 Save and create new version ====

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When you go for the option Save and create a new version you will see the following pop-up:

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[[image:Main.Images.Microlearning.WebHome@crashcourse-api-gateway-api-data-model--save-and-create-new-version-pop-up.png]]

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Choose whether this was a major, minor, or patch upgrade and give a description of the version that tells you and others what you have changed. Something like this

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[[image:Main.Images.Microlearning.WebHome@crashcourse-api-gateway-api-data-model--save-and-create-new-version-pop-up-filled-in.png]]

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Press the button Create version and eMagiz will save your changes.

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==== 3.1.2 Save and continue ====

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When you are not sure that the version you are currently working on is ready for Deploy, you can select the other option called Save and continue.

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When choosing this option eMagiz will automatically create a temporary version of your flow in its current state.

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You can view who made what (temporary) version when you navigate to the History option on the API Gateway Data Model level.

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[[image:Main.Images.Microlearning.WebHome@crashcourse-api-gateway-api-data-model--history-of-data-model.png]]

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This history of the changes on the API Gateway Data Model is not only useful for auditing purposes, but also helps you identify who you should ask about the latest changes.

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As you can see the default description of an autosaved version is Autosaved version. You can give such a version a more descriptive name by selecting it and pressing Edit.

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[[image:Main.Images.Microlearning.WebHome@crashcourse-api-gateway-api-data-model--edit-description-auto-saved-version.png]]

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That action will lead you to the following pop-up. In this pop-up, you can change the description of the autosaved version to something that makes clear what you did.

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[[image:Main.Images.Microlearning.WebHome@crashcourse-api-gateway-api-data-model--edit-description-auto-saved-version-pop-up.png]]

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Simply press Save when you are done and the description will be changed.

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[[image:Main.Images.Microlearning.WebHome@crashcourse-api-gateway-api-data-model--edit-description-auto-saved-version-result.png]]

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== 4. Key takeaways ==