中继现代-什么是database.js，有必要吗？

Question

In the Relay Modern example app todo-modern there is a file called database.js. Is this file necessary in all Relay Modern apps? If not, how do you define {nodeInterface, nodeField} without it? It seems to have all of these getter functions that I don't understand the point of.

I'm finding that there is not enough documentation or examples of Relay Modern. It is quite frustrating.

Answer 1

This isn't clearly stated in the documentation, but schema.js and database.js are for the purposes of mocking a remote server service running GraphQL. I already have a PHP backend running a GraphQL server, so here's what I had to do:

1. Install the npm package get-graphql-schema globally.
2. Add an npm script to my package.json: "generate-graphql": "get-graphql-schema http://0.0.0.0:8000/graphql > ./App/Data/schema.graphql" . Obviously, change the local endpoint to your server's graphql endpoint, and change the output to where you want your schema to exist
3. Run npm run generate-graphql which generates the schema
4. Add an npm script to use the new schema to build necessary generated files: "relay:build": "relay-compiler --src ./App --schema ./App/Data/schema.graphql" . Again, change endpoints as necessary.
5. Run this new script. You should be good to go!