Create and modify data

Introduction

1. Object are first created locally
2. Object can then be persisted in Olympe Database
3. Properties values can be updated
4. Relations can be created between objects
5. Data operations can be (optionally) grouped into a Transaction )

There are other actions to craete/modify data:

• Delete Object
• Detach All Relations
• Detach Relation
• ...

See transaction module documentation page for more details.

Best practices

Create Constructors: Actions to create Objects (e.g. Create Note) with inputs for attributes (content, summary, …). Constructors call to “Persist” Action.

Create Getters: Functions to get all properties of an Object (e.g. Note’s Attributes) with the object as input (the note) and attributes as outputs (content, summary, …)

Create Setters: Actions to update an Object ( e.g. Set Note’s Content) with the object (the note) and the attribute value (content) as inputs

Exercise 10 – Notes Constructor

The goal of this exercise is to define a reusable action which creates a new Note (aka a Note constructor).

1. Go to Folder “Data”
2. Create a new Action named “Create Note”
3. Open the new Action and complete it as follow:

Exercise 11 – Notes Attributes

The goal of this exercise is to define a reusable function which returns the attributes of a new note.

1. Go to Folder “Data”
2. Create a new Function named “Note Attributes”
3. Open the new Function and complete it as follow:

Exercise 12 – New Note screen

The goal of this exercise is to define a screen which creates a new note.

1. Go to Screen “New Note”
2. Rename Event “New Header On left button click” to “To home screen” (=> Context editor)
3. Add a Text Field named “Summary Field”
   • Placeholder = “Summary”
4. Add a Text Area named “Content Field”
   • Placeholder = “Content”
5. Add a Button named “Create Button”
   • Text to “Create”
6. Group components added before
   • Group position = Center
   • Click on "Edit" button (on the group) to edit group layout properties (4th tab):
     • Group layout = Vertical
     • Group Horizontal Align = Center
     • Group Spacing = 20
     • Children Width = 300
7. Add an Action triggered by “Create Button” on click event which:
   • Create a new note from values from “Summary Field” and “Content Field”
   • Dispatch the event “To home screen”

This is how should look the action: