createObjectStore() as you can see in case 1 accepts a second parameter that indicates the index key of the database. This is very useful when you store objects: put() calls don’t need a second parameter, but can just take the value (an object) and the key will be mapped to the object property that has that name.
The index gives you a way to retrieve a value later by that specific key, and it must be unique (every item must have a different key)
A key can be set to auto increment, so you don’t need to keep track of it on the client code:
db.createObjectStore('notes', { autoIncrement: true })
Use auto increment if your values do not contain a unique key already (for example, if you collect email addresses without an associated name).
Lessons in this unit:
| 0: | Introduction |
| 1: | Loading the idb library |
| 2: | Creating a database and a store |
| 3: | Adding data into a store |
| 4: | Retriving data from a store |
| 5: | Deleting data |
| 6: | Migrations |
| 7: | ▶︎ Unique keys |
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