Entity Relationships Part 1: One-To-Many

Adding a Car Class

One-To-Many Relation

Clarification

At the end of the video, the person column in the car table (the table to the right) is called a foreign key column as the values in the column are ids on th…


This content originally appeared on DEV Community and was authored by Software Development Academy

Adding a Car Class

One-To-Many Relation

Clarification

At the end of the video, the person column in the car table (the table to the right) is called a foreign key column as the values in the column are ids on the person table (table to the left)

One-To-Many Implementation

Avoiding Recursive JSON Representation

Snippets & Commands

JSON annotations

Ignore the property completely:

@JsonIgnore

or make the property only be rendered as the id:

@JsonIdentityInfo(generator = ObjectIdGenerators.PropertyGenerator.class, property = "id")
@JsonIdentityReference(alwaysAsId = true)

Updating Car & Validation

Snippets & Commands

build.gradle

plugins {
    id 'org.springframework.boot' version '2.4.4'
    id 'io.spring.dependency-management' version '1.0.11.RELEASE'
    id 'java'
}

repositories {
    mavenCentral()
}

dependencies {
    implementation 'org.springframework.boot:spring-boot-starter-web'
    implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
    implementation 'org.springframework.boot:spring-boot-starter-validation'
    runtimeOnly 'org.postgresql:postgresql'
}


This content originally appeared on DEV Community and was authored by Software Development Academy


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