Fragments Reusable Query Components
They are the reusable components of a query, which can be reused at multiple places. They need to defined once in the file. This helps us in cases where we have a complex query, and we want to declare it only once, so we can reuse it at multiple places in the code.
Example
In the below query, we have
- basicInfoOfPokemon – It represents a fragment that is defined on the Pokemon type. It determines which fields to include from the Pokemon type.
- id, and name – they represent the fields that are present in the fragment that is defined on the Pokemon type.
- retrievePokemon – root field of the query that represents the data that the client wants to retrieve from the API.
- pikachu – argument for the query passed that represents the specific criteria that the user wants the information about
- firstPokemon – they represent the aliases that are assigned to the pokemon field of the query, It implies that the data returned by the respective queries will be renamed as firstPokemon, and secondPokemon, respectively.
fragment basicInfoOfPokemon on Pokemon {
name
id
}
query retrievePokemon{
firstPokemon: pokemon(name:"pikachu") {
...basicInfoOfPokemon
}
}
Output:
The output of the above query call will look like below
Querying Data with GraphQL
GraphQL is an open-source technology that allows us to query only the data that we require, unlike the traditional REST architecture which returns us the entire resources and data with specific endpoints configured for the same. Using GraphQL, we specify using the query the data that we want, and it returns the specified data in the specified format. It helps reduce the amount of data transfer over the network and saves network bandwidth. In this article, we will learn how to Query data using GraphQL.
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