DeletePostMutation.js

import {
  commitMutation,
  graphql,
} from 'react-relay'
import {ConnectionHandler} from 'relay-runtime'
import environment from './Environment'
​
const mutation = graphql`
  mutation DeletePostMutation($input: DeletePostInput!) {
    deletePost(input: $input) {
      deletedId
    }
  }
`
​
export default (postId, viewerId) => {
  const variables = {
    input: {
      id: postId,
      clientMutationId: ""
    },
  }
  commitMutation(
    environment,
    {
      mutation,
      variables,
      onError: err => console.error(err),
      optimisticUpdater: (proxyStore) => {
        // ... you'll implement this in a bit
      },
      updater: (proxyStore) => {
        // ... this as well
      },
    },
  )
}