Question

我是Rails的新手。我有2个现有模型要建立1对1关系。

class User
  has_one :info

class Info
  belongs_to :user

我的问题是我是否需要为它们每个创建外键？我的最终目标是仅通过以下方式访问信息：@user.info。

Answer 1

正如评论者所说，不，你不会。仅belongs_to端需要外键。让我为这个特定问题指向the Rails guides，但更广泛地说，它们是此类信息的绝佳资源。

Answer 2

从简单开始。

import { Injectable } from '@angular/core';
import { HttpResponse } from '@angular/common/http';
import { Resolve, ActivatedRouteSnapshot, RouterStateSnapshot, Routes } from '@angular/router';
import { JhiPaginationUtil, JhiResolvePagingParams } from 'ng-jhipster';
import { UserRouteAccessService } from 'app/core';
import { Observable, of } from 'rxjs';
import { filter, map } from 'rxjs/operators';
import { ContactInfo } from 'app/shared/model/burocracy/contact-info.model';
import { ContactInfoService } from './contact-info.service';
import { ContactInfoComponent } from './contact-info.component';
import { ContactInfoDetailComponent } from './contact-info-detail.component';
import { ContactInfoUpdateComponent } from './contact-info-update.component';
import { ContactInfoDeletePopupComponent } from './contact-info-delete-dialog.component';
import { IContactInfo } from 'app/shared/model/burocracy/contact-info.model';

@Injectable({ providedIn: 'root' })
export class ContactInfoResolve implements Resolve<IContactInfo> {
    constructor(private service: ContactInfoService) {}

    resolve(route: ActivatedRouteSnapshot, state: RouterStateSnapshot): Observable<IContactInfo> {
        const id = route.params['id'] ? route.params['id'] : null;
        if (id) {
            return this.service.find(id).pipe(
                filter((response: HttpResponse<ContactInfo>) => response.ok),
                map((contactInfo: HttpResponse<ContactInfo>) => contactInfo.body)
            );
        }
        return of(new ContactInfo());
    }
}

export const contactInfoRoute: Routes = [
    {
        path: '',
        component: ContactInfoComponent,
        resolve: {
            pagingParams: JhiResolvePagingParams
        },
        data: {
            authorities: ['ROLE_USER'],
            defaultSort: 'id,asc',
            pageTitle: 'frontendApp.burocracyContactInfo.home.title'
        },
        canActivate: [UserRouteAccessService]
    },
    {
        path: ':id/view',
        component: ContactInfoDetailComponent,
        resolve: {
            contactInfo: ContactInfoResolve
        },
        data: {
            authorities: ['ROLE_USER'],
            pageTitle: 'frontendApp.burocracyContactInfo.home.title'
        },
        canActivate: [UserRouteAccessService]
    },
    {
        path: 'new',
        component: ContactInfoUpdateComponent,
        resolve: {
            contactInfo: ContactInfoResolve
        },
        data: {
            authorities: ['ROLE_USER'],
            pageTitle: 'frontendApp.burocracyContactInfo.home.title'
        },
        canActivate: [UserRouteAccessService]
    },
    {
        path: ':id/edit',
        component: ContactInfoUpdateComponent,
        resolve: {
            contactInfo: ContactInfoResolve
        },
        data: {
            authorities: ['ROLE_USER'],
            pageTitle: 'frontendApp.burocracyContactInfo.home.title'
        },
        canActivate: [UserRouteAccessService]
    }
];

export const contactInfoPopupRoute: Routes = [
    {
        path: ':id/delete',
        component: ContactInfoDeletePopupComponent,
        resolve: {
            contactInfo: ContactInfoResolve
        },
        data: {
            authorities: ['ROLE_USER'],
            pageTitle: 'frontendApp.burocracyContactInfo.home.title'
        },
        canActivate: [UserRouteAccessService],
        outlet: 'popup'
    }
];

PS：我真的建议从一些视频教程开始，然后重复人们在视频中所做的事情

Rails 1对1关系迁移

2 个答案: