Entities

An entity is an object type with fields split between multiple subgraphs. An entity is the building block of a supergraph.

rover dev

Runs your supergraph in your local dev environment.

For each subgraph, provide:

• Subgraph name
• Where your subgraph is running (locally or remotely)
• Schema file (optional, can use introspection)

Setting up rover dev

1. If you stopped the recipes subgraph server at some point, start it again. In a terminal window, in the recipes repo, run:

   Terminal window 1: recipes server

   npm run dev

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2. In a second terminal window, run:

   Terminal window 2: rover dev process 1

   rover dev --name recipes \
     --schema ./schema.graphql \
     --url http://localhost:4001

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3. In your browser, go to http://localhost:4000. You should see a Sandbox environment, where you can query the locally-running router! This is like the cloud router, but running locally.

   At this point, which of the following fields can you query at http://localhost:4000?

   randomRecipeallRecipesrecentlyAddedRecipesallCookware

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4. In another terminal window, run:

   Terminal window 3: rover dev process 2

   rover dev --name kitchenware \
    --url https://poetic-plates-kitchenware-api.herokuapp.com/

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   Which of the following statements about rover dev are true?

   You must provide a schema file when running rover devClosing the second rover dev process kills all other processes and shuts down the local supergraphClosing the first rover dev process kills all other processes and shuts down the local supergraphYou can use local and remote subgraph endpoints

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5. Head back to http://localhost:4000 and run the query below to confirm everything is working.

   query GetRandomRecipeAndAllCookware {
     randomRecipe {
       name
       description
       readyTime
     }
     allCookware {
       name
       description
       cleaningInstructions
     }
   }

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