Package Exports

resolve-query

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Readme

🔍 resolve-query

Provides a function to execute a query and get required information from a read model.

Usage

When initializing a query, pass the following arguments:

eventStore - configured eventStore instance
readModels - array of read models

After the query is initialized, you get a function that is used to get data from read models by GraphQL request. This function receives the following arguments:

readModelName (required) - read model name
qraphQLQuery (required) - GraphQL query to get data
graphQLVariables - specify it, if graphQLQuery contains variables
getJwt - callback for retrieve actual client state stored in verified JWT token

Example

import createQueryExecutor from 'resolve-query'
import createEventStore from 'resolve-es'
import createStorageDriver from 'resolve-storage-memory'
import createBusDriver from 'resolve-bus-memory'

const eventStore = createEventStore({ 
    storage: createStorageDriver(), 
    bus: createBusDriver()
})

const readModels = [{
  name: 'users',
  initialState: [],
  eventHandlers: {
    UserCreated: (state, { payload })  => state.concat(payload)
  },
  gqlSchema: `
    type User { id: ID!, UserName: String }
    type Query { Users: [User], UserById(id: ID!): User }
  `,
  gqlResolvers: {
    Users: root => root,
    UserById: (root, args) => root.find(user => user.id === args.id)
  }
}]

const query = createQueryExecutor({ eventStore, readModels })

// Request whole read-model state
query('users').then(state => {
  console.log('Read model Users', state)
})

// Request by GraphQL query without paramaters
query('users', 'query { Users { id, UserName } }').then(state => {
  console.log('Read model Users', state)
})

// Request by GraphQL query with paramaters
query(
  'users',
  'query ($testId: ID!) { UserById(id: $testId) { id, UserName } }',
  { testId: 1 }
).then(state => {
  console.log('Read model Users', state)
})