Effective methods for managing ngrx/redux action contexts

Question

Effective methods for managing ngrx/redux action contexts

I've been searching for the best approach to handle this situation, but I haven't come across one yet.

issue: I want to avoid duplicating action files, such as in the examples home-todos.actions and sport-todos-actions. Instead, I aim to use a single to-dos.action file and a common reducer.

example: Let's say I'm developing a todo application where dispatching an action with type 'ADD_TODO_ASYNC' triggers actions in both the home and sport sections.

todos.actions.ts

const ADD_TODO_ASYNC = 'ADD TODO ASYNC';
const ADD_TODO_COMPLETE = 'ADD TODO COMPLETE';
const ADD_TODO_FAILD = 'AD TODO FAILD';

class addTodoComplete {
    type = ADD_TODO_COMPLETE;
}
class addTodoFaild {
    type = ADD_TODO_COMPLETE;
}

export type Actions = addTodoComplete | addTodoFaild;

sport.effects.ts

@Injectable()
export class SportTodosService {

    @Effect() ADD_TODO_ASYNC$ = this.actions$.ofType(TodosActionTypes.ADD_TODO_ASYNC)
    .map(toPayload)
    .swithMap( (todo: Todo) => this.api.addTodo(todo))
    .map((todo: Todo) => TodosActionTypes.addTodoComplete(todo))
    constructor(
        private actions$: Actions,
        private api: api
    ) { }

}

home.effects.ts

export class HomeTodosService {
    @Effect() ADD_TODO_ASYNC$ = this.actions$.ofType(TodosActionTypes.ADD_TODO_ASYNC)
        ...
    constructor(
        ...
    ) { }

}

reducer

function todosReducer(state, action: TodosActionTypes.Actions) {
    switch (action.type) {
        case TodosActionTypes.ADD_TODO_COMPLETE:
            return state;
        default:
            return state;
    }
}

app.module.ts

@NgModule({
    declarations: [
      AppComponent
    ],
    imports: [
      StoreModule.forRoot({
        sport: todosReducer,
        home: todosReducer,
      }),
      EffectsModule.forRoot([
        SportTodosService
        HomeTodosService,
      ])
    ],
    providers: [
        api
    ],
    bootstrap: [AppComponent]
  })
  export class AppModule { }

I'm trying to figure out the most optimal approach for this scenario. Should I prefix actions with context like 'HOME_ADD_TODO' & 'SPORT_ADD_TODO'?

Is there an official guideline to follow?

If you have a solution, whether it pertains to redux or ngrx, please share your insights.

Thank you!

javascript angular typescript redux ngrx

Answer 1

Answer №1

If you truly want to grasp the complexity of this issue, it is crucial to reassess your application architecture. The notion of reusable reducers and actions may seem enticing at first glance, as it reduces redundancy and promotes the "Don't Repeat Yourself" principle.

However, a deeper examination reveals the potential dangers that lie ahead. While using a single 'ADD_TO_DO' action for both home and sports sections appears efficient now, it could spell trouble in the future. Imagine if your boss or customers demand a different functionality for adding to-dos related to sports - modifying the generic reducer could break your entire app. Although you could resort to applying patches with conditional statements initially, this will only make your codebase less adaptable, readable, and maintainable as your application scales up.

Therefore, splitting the reducers into specific ones for each section along with separate action files becomes imperative. While this approach might seem redundant at present, it offers significant advantages and flexibility for future enhancements.

Best of luck navigating through these challenges!

Answer 2

If you truly want to grasp the complexity of this issue, it is crucial to reassess your application architecture. The notion of reusable reducers and actions may seem enticing at first glance, as it reduces redundancy and promotes the "Don't Repeat Yourself" principle.

However, a deeper examination reveals the potential dangers that lie ahead. While using a single 'ADD_TO_DO' action for both home and sports sections appears efficient now, it could spell trouble in the future. Imagine if your boss or customers demand a different functionality for adding to-dos related to sports - modifying the generic reducer could break your entire app. Although you could resort to applying patches with conditional statements initially, this will only make your codebase less adaptable, readable, and maintainable as your application scales up.

Therefore, splitting the reducers into specific ones for each section along with separate action files becomes imperative. While this approach might seem redundant at present, it offers significant advantages and flexibility for future enhancements.

Best of luck navigating through these challenges!

Answer 3

Answer №2

Check out this link for some useful patterns and techniques for ngrx.

The functionality is designed to operate as you have detailed it. The this.actions$ Observable will emit wherever it is utilized. Since TodosActionTypes.ADD_TODO_ASYNC is the same type in both home.effects.ts and sport.effects.ts, it will be emitted in both contexts.

It may not be possible to avoid having separate actions in your scenario, but you can reduce the amount of repetitive code written.

You could consider implementing something along these lines:

todos.actions.ts

abstract class addTodoComplete{
   constructor(readonly type: string){
      //rest of the behavior
   }
}
abstract class addTodoFailed{
   constructor(readonly type: string){
     //rest of the behavior
   }
}

todos.sport-actions.ts

const ADD_TODO = "[Sport] Add Todo";
const ADD_TODO_FAILED = "[Sport] Add Todo Failed";
class sportsAddTodoComplete extends addTodoComplete{
   constructor(){
      super(ADD_TODO);
      //rest of the behavior
   }
}
class sportsAddTodoFailed extends addTodoFailed{
   constructor(){
     super(ADD_TODO_FAILED);
      //rest of the behavior
   }
}

A similar approach would apply to the home version.

In addition, it's likely that you will need distinct SportTodosActionTypes and HomeTodosActionTypes.

This method won't completely eliminate "copy-paste" tasks, but it should help streamline the process to a certain extent.

UPDATE:

Regarding reducers, while you will indeed have to create two reducers using this method, it doesn't necessarily mean duplicating all the work.

sport.reducer.ts

import { todoReducer } from './reducer';

export function sportsTodoReducer(state, action: SportTodoActionTypes.Actions){
   todoReducer(state, action);
}

Similar logic can be applied to the home version.

Answer 4

Check out this link for some useful patterns and techniques for ngrx.

The functionality is designed to operate as you have detailed it. The this.actions$ Observable will emit wherever it is utilized. Since TodosActionTypes.ADD_TODO_ASYNC is the same type in both home.effects.ts and sport.effects.ts, it will be emitted in both contexts.

It may not be possible to avoid having separate actions in your scenario, but you can reduce the amount of repetitive code written.

You could consider implementing something along these lines:

todos.actions.ts

abstract class addTodoComplete{
   constructor(readonly type: string){
      //rest of the behavior
   }
}
abstract class addTodoFailed{
   constructor(readonly type: string){
     //rest of the behavior
   }
}

todos.sport-actions.ts

const ADD_TODO = "[Sport] Add Todo";
const ADD_TODO_FAILED = "[Sport] Add Todo Failed";
class sportsAddTodoComplete extends addTodoComplete{
   constructor(){
      super(ADD_TODO);
      //rest of the behavior
   }
}
class sportsAddTodoFailed extends addTodoFailed{
   constructor(){
     super(ADD_TODO_FAILED);
      //rest of the behavior
   }
}

A similar approach would apply to the home version.

In addition, it's likely that you will need distinct SportTodosActionTypes and HomeTodosActionTypes.

This method won't completely eliminate "copy-paste" tasks, but it should help streamline the process to a certain extent.

UPDATE:

Regarding reducers, while you will indeed have to create two reducers using this method, it doesn't necessarily mean duplicating all the work.

sport.reducer.ts

import { todoReducer } from './reducer';

export function sportsTodoReducer(state, action: SportTodoActionTypes.Actions){
   todoReducer(state, action);
}

Similar logic can be applied to the home version.

Answer 5

Answer №3

To solve this issue, consider utilizing action Namespaces

When dealing with multiple actions in an application that pertain to different parts of the store, it's essential to use Action Constants as unique identifiers. By implementing Action Namespaces, we can prevent duplicate action logical failures. Here's how it works:

// todos.actions.ts
export const ADD_TODO = '[Home] Add Todo';

By including a namespace in the Action Constant that aligns with the specific store slice being used, such as the name of the feature module, we can easily identify the context of each action. This is especially helpful when debugging the application by logging actions. For example, switching from "Home" to "Sport" views would result in output like this:

[Home] Add Todo
[Home] Add Todo Success
[Sport] Add Todo
[Sport] Add Todo Success

For more information, refer to the SOURCE.

Answer 6

To solve this issue, consider utilizing action Namespaces

When dealing with multiple actions in an application that pertain to different parts of the store, it's essential to use Action Constants as unique identifiers. By implementing Action Namespaces, we can prevent duplicate action logical failures. Here's how it works:

// todos.actions.ts
export const ADD_TODO = '[Home] Add Todo';

By including a namespace in the Action Constant that aligns with the specific store slice being used, such as the name of the feature module, we can easily identify the context of each action. This is especially helpful when debugging the application by logging actions. For example, switching from "Home" to "Sport" views would result in output like this:

[Home] Add Todo
[Home] Add Todo Success
[Sport] Add Todo
[Sport] Add Todo Success

For more information, refer to the SOURCE.

Effective methods for managing ngrx/redux action contexts

Answer №1

Answer №2

Answer №3

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