NGビルド--prodは私にエラー

Question

を追加しましたアプリモジュール、これは私が生産アプリを釜しようとすると、私は取得していますエラーですDataServiceの

のひとつの宣言を提供します。私はすべてのインポートをチェックし、パラメータはすべて正しいと思われるです。たぶん私は何かを逃しています。すべてのサービスもインポートされます。

ERROR in Error: Can't resolve all parameters for DataService in /Users/avide/WebstormProjects/cocina/cocina.do/src/app/services/data.service.ts: (?, [object Object]). 

この

は、DataServiceファイル

import {AppError} from '../common/app-error'; 
 
import {NotFoundError} from '../common/not-found-error'; 
 
import {BadInput} from '../common/bad-input'; 
 
import {Injectable} from '@angular/core'; 
 
import {Observable} from 'rxjs/Observable'; 
 
import {Http} from '@angular/http'; 
 

 
@Injectable() 
 
export class DataService { 
 
    constructor(private url: string, private http: Http) { 
 
    } 
 

 
........ 
 

 
} 
 

これはapp.moduleである

import { UserService } from './services/user.service'; 
 
import { FavoriteService } from './services/favorite.service'; 
 
import { LikeService } from './services/like.service'; 
 
import { PostService } from './services/post.service'; 
 
import { SocialService } from './services/social.service'; 
 
import { EmailService } from './services/email.service'; 
 
import { DataService } from './services/data.service'; 
 
import { RecipeService } from './services/recipe.service'; 
 
import { AuthService } from './services/auth.service'; 
 
import { NotFoundComponent } from './not-found/not-found.component'; 
 
import { NoAccessComponent } from './no-access/no-access.component'; 
 

 
import { RecipeFormComponent } from './admin/recipe-form/recipe-form.component'; 
 
import { AdminComponent } from './admin/admin/admin.component'; 
 
import { RouterModule } from '@angular/router'; 
 
import { FormsModule, ReactiveFormsModule } from '@angular/forms'; 
 
import { HttpModule } from '@angular/http'; 
 
import { BrowserModule } from '@angular/platform-browser'; 
 
import { NgModule } from '@angular/core'; 
 
import { AppComponent } from './app.component'; 
 
import { NavbarComponent } from './navbar/navbar.component'; 
 
import { HomeComponent } from './home/home.component'; 
 
import { EmailFormComponent } from './email-form/email-form.component'; 
 
import { RecipeComponent } from './recipe/recipe.component'; 
 
import { SearchComponent } from './search/search.component'; 
 
import { CategoriesComponent } from './categories/categories.component'; 
 
import { LoginFormComponent } from './login-form/login-form.component'; 
 
import { SigninFormComponent } from './signin-form/signin-form.component'; 
 
import { FilterPipe } from './filter.pipe'; 
 
import { CapitalizePipe } from './capitalize.pipe'; 
 
import {NgxPaginationModule} from 'ngx-pagination'; 
 
import { PostFormComponent } from './admin/post-form/post-form.component'; 
 
import { AboutComponent } from './about/about.component'; 
 
import { AlertComponent } from './alert/alert.component'; 
 
import { LikeComponent } from './like/like.component'; 
 
import { FavoriteComponent } from './favorite/favorite.component'; 
 
import { ProfileComponent } from './profile/profile.component'; 
 
import { BlogComponent } from './blog/blog.component'; 
 
import { PostComponent } from './post/post.component'; 
 
import {AuthGuard} from './auth.guard'; 
 
import {AdminAuthGuard} from './admin-auth.guard'; 
 

 
@NgModule({ 
 
    declarations: [ 
 
    AppComponent, 
 
    NavbarComponent, 
 
    HomeComponent, 
 
    EmailFormComponent, 
 
    RecipeComponent, 
 
    SearchComponent, 
 
    CategoriesComponent, 
 
    RecipeFormComponent, 
 
    LoginFormComponent, 
 
    SigninFormComponent, 
 
    AdminComponent, 
 
    FilterPipe, 
 
    CapitalizePipe, 
 
    PostFormComponent, 
 
    AboutComponent, 
 
    AlertComponent, 
 
    NoAccessComponent, 
 
    NotFoundComponent, 
 
    LikeComponent, 
 
    FavoriteComponent, 
 
    ProfileComponent, 
 
    BlogComponent, 
 
    PostComponent 
 
    ], 
 
    imports: [ 
 
    BrowserModule, 
 
    HttpModule, 
 
    FormsModule, 
 
    ReactiveFormsModule, 
 
    NgxPaginationModule, 
 
    RouterModule.forRoot([ 
 
     { path: '', component: HomeComponent}, 
 
     { path: 'receta/:categoria/:pais/:id', component: RecipeComponent }, 
 
     { path: 'blog/:id', component: PostComponent }, 
 
     { path: 'about', component: AboutComponent}, 
 
     { path: 'search', component: SearchComponent}, 
 
     { path: 'blog', component: BlogComponent }, 
 
     { path: 'post', component: BlogComponent }, 
 
     { path: 'perfil/:username', component: ProfileComponent, canActivate: [AuthGuard] }, 
 
     { path: 'admin/post/new', component: PostFormComponent, canActivate: [AuthGuard, AdminAuthGuard] }, 
 
     { path: 'admin/receta/new', component: RecipeFormComponent, canActivate: [AuthGuard, AdminAuthGuard] }, 
 
     { path: 'admin/receta/edit/:id', component: RecipeFormComponent, canActivate: [AuthGuard, AdminAuthGuard] }, 
 
     { path: 'admin', component: AdminComponent, canActivate: [AuthGuard, AdminAuthGuard] }, 
 
     { path: 'login', component: LoginFormComponent }, 
 
     { path: 'register', component: SigninFormComponent }, 
 
     { path: 'unauthorized', component: NoAccessComponent }, 
 
     { path: '**', component: NotFoundComponent } 
 
    ]) 
 
    ], 
 
    providers: [ 
 
    DataService, 
 
    RecipeService, 
 
    EmailService, 
 
    SocialService, 
 
    PostService, 
 
    AuthService, 
 
    LikeService, 
 
    FavoriteService, 
 
    UserService, 
 
    AuthGuard, 
 
    AdminAuthGuard 
 
    ], 
 
    bootstrap: [AppComponent] 
 
}) 
 
export class AppModule { }

Answer 1

これは私のために働いた。 https://stackoverflow.com/a/35041823/8585804

@Injectable() 
 
export class ParentService { 
 
    root:string = "This content comes from: "; 
 
    myString:string = "The Parent"; 
 
    resultString:string; 
 
    constructor(){ 
 
    this.init(); 
 
    } 
 
    init() { 
 
    this.resultString = this.root + this.myString; 
 
    } 
 
} 
 

 

 
@Injectable() 
 
export class ChildService extends ParentService { 
 
    constructor(){ 
 
    super(); 
 
    } 
 
    init() { 
 
    this.myString = "The Child"; 
 
    super.init(); 
 
    } 
 
}