Clarification on Data Handling and View Rendering in ManageIQ

[Dhamo1107]

Hi All,

I am currently working on understanding the data fetching and rendering flow in ManageIQ, and I have noticed that it differs from the standard approach used in typical Rails applications. Specifically, I am trying to comprehend how data is retrieved by the controllers, passed to the views, and subsequently handled by React and Angular components.

Could you please provide a detailed explanation of the following points?

1) Data Fetching in Controllers:

• How do controllers in ManageIQ fetch data? Specifically, how does the ReportAdditionalData class interact with the model to retrieve the necessary data?

• What are the key differences in this process compared to a standard Rails application where the controller directly fetches data from the model?

2) JSON Response Handling:

• Once the data is fetched and formatted in the controller, how is it sent as a JSON response to the client-side to handle ajax requests?

3) Rendering Data in Views:

• Once the data is fetched by the frontend components, how is it stored and rendered in the view files by GTL?

• How datatable is used in views?

• How do the React and Angular components work together with Rails views (if applicable) to display the data on the browser?

Could you provide a step-by-step example of a typical workflow where a user action triggers a controller method, data is fetched, formatted, and sent as a JSON response, and finally rendered by a frontend component?
Understanding these aspects in detail would significantly help in grasping the ManageIQ architecture.

Thank you for your time and assistance. Looking forward to your detailed response.