Get Started - Quickstart Guide - Dgraph documentation

[gmlewis (Glenn Lewis)]

@diggy

Step 3: Alter Schema

Alter the schema to add indexes on some of the data so queries can use term matching, filtering and sorting.

curl "localhost:8080/alter" -XPOST -d 

Tip To submit the schema from the Ratel UI, go to Schema page, click on Bulk Edit, and paste the schema.
name: string @index(term) .
release_date: datetime @index(year) .
revenue: float .
running_time: int .
type Person {
name
}
type Film {
name
release_date
revenue
running_time
starring
director
}
’ | python -m json.tool | less

Tip To submit the schema from the Ratel UI, go to Schema page, click on **Bulk Edit**, and paste the schema.

This step causes an error:

{
    "errors": [
        {
            "extensions": {
                "code": "Error"
            },
            "message": "Schema change not allowed from [uid] => uid without deleting pred: starring"
        }
    ]
}

The way I worked around the problem was to manually forcefully drop the “starring” and “director” fields from the database (messing up the data), and then by making the schema change in Step 3, and finally go back and mutate the entire database again with Step 2.

Once I did this, the queries in Step 4 started to work.