Multiple Select In Google Datastore Query Throwing Apierror: Precondition Failed Error In Node

I'm using following query to retrieve some entities from google Datastore: The above code works fine if I select only one property i.e. But with multiple select its throwing 412

Solution 1:

You need to create a multi-property index in order to use multi-property queries.

Because you are not using App Engine, these indexes need to be manually created.

I have a tutorial here that covers this.

Here are the steps:

1. Install Java 7 Runtime (or later version) http://java.com/
   • I recommend using Cloud Shell which has Java already installed and configured
2. Create a folder called WEB-INF
3. Inside that folder, you need three files:
   • appengine-web.xml (replace YOUR_PROJECT_ID_HERE with your project ID)
   • web.xml
   • datastore-indexes.xml (Remove the indexes I used for my sample)
4. In the datastore-indexes.xml file, you need to define your multi-property indexes. Follow the documentation.
5. Install the gcd tool
6. Finally, run the gcd tool (one directory above the WEB-INF folder)
   • Linux/Mac path/to/gcd.sh updateindexes --auth_mode=oauth2 .
   • Windows path/to/gcd.cmd updateindexes --auth_mode=oauth2 .

After a few minutes, your indexes should be created.