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@urql/exchange-populate
Advanced tools
An exchange that automaticcally populates the mutation selection body
populate
is an exchange for auto-populating fields in your mutations.
Read more about the populateExchange
on our docs!
First install @urql/exchange-populate
alongside urql
:
yarn add @urql/exchange-populate
# or
npm install --save @urql/exchange-populate
You'll then need to add the populateExchange
, that this package exposes.
import { createClient, dedupExchange, cacheExchange, fetchExchange } from 'urql';
import { populateExchange } from '@urql/exchange-populate';
const client = createClient({
url: 'http://localhost:1234/graphql',
exchanges: [dedupExchange, populateExchange({ schema }), cacheExchange, fetchExchange],
});
The schema
option is the introspection result for your backend graphql schema, more information
about how to get your schema can be found in the "Schema Awareness" Page of the Graphcache documentation..
Consider the following queries which have been requested in other parts of your application:
# Query 1
{
todos {
id
name
}
}
# Query 2
{
todos {
id
createdAt
}
}
Without the populateExchange
you may write a mutation like the following which returns a newly created todo item:
# Without populate
mutation addTodo(id: ID!) {
addTodo(id: $id) {
id # To update Query 1 & 2
name # To update Query 1
createdAt # To update Query 2
}
}
By using populateExchange
, you no longer need to manually specify the selection set required to update your other queries. Instead you can just add the @populate
directive.
# With populate
mutation addTodo(id: ID!) {
addTodo(id: $id) @populate
}
Note: The above two mutations produce an identical GraphQL request.
FAQs
An exchange that automaticcally populates the mutation selection body
The npm package @urql/exchange-populate receives a total of 648 weekly downloads. As such, @urql/exchange-populate popularity was classified as not popular.
We found that @urql/exchange-populate demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 19 open source maintainers collaborating on the project.
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