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【GraphQL, AWS】schema.graphqlに記載するリレーションの書き方4選
何について書く？
GraphQL スキーマーを作成する際のリレーションの書き方
内容
- 1対1（HasOne）
type One @model {
id: ID!
name: String!
anotherOneID: ID!
anotherOne: AnotherOne @connection(fields: ["anotherOneID"])
}
type AnotherOne @model {
id: ID!
name: String!
}
- 1対多(HasMany)
type One @model {
id: ID!
name: String!
manys: [Many] @connection(keyName: "byOne" fields: ["iD"])
}
type Many @model {
@key(name: "byOne", fields: ["oneID"]) {
id: ID!
oneID: ID!
content: String!
}
- 1対多に多対1を追加し双方向接続を可能にする(belongsto)
type One @model {
id: ID!
name: String!
manys: [Many] @connection(keyName: "byOne" fields: ["iD"])
}
type Many @model {
@key(name: "byOne", fields: ["oneID"]) {
id: ID!
oneID: ID!
content: String!
one: One @connection(fields: ["oneID"])
}
- 多対多は中間テーブル下記例（ManyAManyB）が必要
type ManyA @model
{
id: ID!
manyBs: [ManyAManyB] @connection(keyName: "byMany", fields: ["id"])
name: String
}
type ManyAManyB
@model(queries: null)
@key ( name: "byManyA", fields: [ "manyAID", "manyBID" ] )
@key ( name: "byManyB", fields: [ "manyBID", "manyAID" ] )
{
id: ID!
manyAID: ID!
manyA: ManyA! @connection(fields:["manyAID"])
manyBID: ID
manyB: ManyB! @connection(fields:["manyBID"])
}
type ManyB @model
{
id: ID!
mainBs: [ManyAManyB] @connection(keyName: "byManyB", fields: ["id"])
name: String
}
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