resolve-redux v0.26.5
resolve-redux
This package contains tools for integrating reSolve with Redux.
Table of Contents 📑
Tools 🛠
createResolveMiddleware
Redux middleware used to:
1) Automatically fetch a view model state and subscribe to events. 2) Send a command to the server side.
This function takes the following arguments:
createResolveMiddleware({ viewModels [, subscribeAdapter] })
createViewModelsReducer
Generates a standard Redux reducer using reSolve view models. It does not take any arguments as it receives required data from createResolveMiddleware automatically.
This reducer includes handling the reSolve's merge
action.
connect
A higher-order component (HOC), which automatically subscribes/unsubscribes to/from a view model by aggregateId and connects a React component to a Redux store.
const mapStateToProps = state => ({
...state[viewModelName][aggregateId],
viewModelName, // required field
aggregateId // required field
});
export default connect(mapStateToProps)(Component);
graphqlConnector
A higher-order component (HOC), which automatically delivers a view model's actual state by a graphql query. A connector takes the following arguments:
gqlQuery
- a GraphQL query for retrieving data from a read modeloptions
- connector options (see ApolloClient'squery
method for details)endpointUrl
- a URL address with a graphql endpoint for a target read model
const ConnectedStoryComponent = gqlConnector(
`query($id: ID!) {
story($id: ID!) {
id
text
}
}`,
{
options: ({ storyId }) => ({
variables: {
id: storyId
},
fetchPolicy: 'network-only'
})
},
'/api/query/graphql'
)(StoryComponent)
createActions
Generates Redux actions using a reSolve aggregate. This function uses the reSolve's sendCommand
action to pass a command from Redux to the server side. Generated actions are named as an aggregate's commands. This function takes two arguments:
aggregate
- reSolve aggregateextendActions
- actions to extend or redefine resulting actions
actions
A plain object used to send special actions to be automatically handled by createResolveMiddleware
. It implements the following functions.
Sends a command to the server side. It takes the object with the following required arguments:sendCommand
command
aggregateId
aggregateName
payload
subscribe
Subscribes to new server-side events. This function takes two arguments:
eventTypes
- an array of event typesaggregateId
- an aggregate id
unsubscribe
Unsubscribes from provided server-side events. This function takes two arguments:
eventTypes
- an array of event typesaggregateId
- an aggregate id
merge
. It takes three arguments:Produces an action handled by a reducer which the [`createViewModelsReducer`](#createviewmodelsreducer) function generates. A view model state is replaced with a new state
viewModelName
- the name of a view model whose state should be updated
aggregateId
- an aggregate id *state
- the state to be merged with the specified view model's existing state
Basic Usage 💻
How to Create Redux Store
import { createStore, applyMiddleware } from 'redux';
import { createResolveMiddleware } from 'resolve-redux';
import reducer from '../reducers';
import viewModels from '../../common/view-models';
const middleware = [createResolveMiddleware(viewModels)];
export default initialState => createStore(reducer, initialState, applyMiddleware(...middleware));
How to Generate Actions from Aggregate
import { createActions } from 'resolve-redux'
import { connect, bindActionCreators } from 'redux'
import App from './components/App'
export const aggregate {
name: 'User',
commands: {
createUser: (state, { aggregateId, payload }) => ({
type: 'UserCreated',
aggregateId,
payload
})
}
}
function mapDispatchToProps(dispatch) {
actions: bindActionCreators(createActions(aggregate))
}
export default connect(() => {}, mapDispatchToProps)(App)
How to Send Command to Server
import { actions } from 'resolve-redux';
export function sendCommandAddTodoItem(aggregateId) {
return {
type: 'SEND_COMMAND_ADD_TODO_ITEM',
aggregateId,
aggregateName: 'TodoList',
payload: { name: 'todo-list' },
command: {
type: 'TodoListItemAdd'
}
};
}
store.dispatch(sendCommandAddTodoItem('aggregateId'));
or
store.dispatch(actions.sendCommand({
aggregateId: 'aggregateId',
aggregateName: 'TodoList',
payload: { name: 'todo-list' },
command: {
type: 'TodoListItemRemove'
}
}));
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