02-query-a-list-of-objects-with-graphql.md

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Summary

We're going to write a query to return a list of pet objects. Along the way, we'll learn a bit more about the GraphQL query language, tackling vocabulary like selection sets and fields.

Notes

To get a list of all pets, we need to query the allPets field. Open up a pair of curly braces to select name and weight for each of these pets, and then click play.

query {
  allPets {
    name
    weight
  }
  totalPets
}

The result: allPets returns an array of pets with name and weight for each of them.

{
  "data": {
    "allPets": [
      {
        "name": "Biscuit",
        "weight": 10.2
      },
      {
        "name": "Jungle",
        "weight": 9.7
      }
    ]
  }
}

If you collapse the allPets field, we'll see that totalPets is also being sent in the query, and we get that data as well.

Personal Take

• Everything wrapped with curly braces is called a selection set.
• Each piece of data that we're requesting is called a field.
• To add comments to the query we use the pound sign or hashtag.