[英]Sequelize and response request GraphQL
我尝试对我的请求GraphQL进行响应。
我尝试了很多事情,但目前我始终拥有Sequence响应,而没有Buckets响应(属于To关联)。
我有2张桌子:
序列[id | 活跃]
铲斗[id | fk_language_id | fk_sequence_id | 活跃]
模型/sequence.js
'use strict';
module.exports = (sequelize, DataTypes) => {
// define sequence
const Sequence = sequelize.define('sequence', {
is_active: {type: DataTypes.BOOLEAN}
});
Sequence.associate = function (models) {
models.Sequence.hasMany(models.Bucket, {
foreignKey: 'fk_sequence_id'
});
return Sequence;
};
模型/bucket.js
'use strict';
module.exports = (sequelize, DataTypes) => {
const Bucket = sequelize.define('bucket', {
code : {type: DataTypes.STRING},
is_active: {type: DataTypes.BOOLEAN}
});
Bucket.associate = function (models) {
models.Bucket.belongsTo(models.Language, {
foreignKey: 'fk_language_id',
});
models.Bucket.belongsTo(models.Sequence, {
foreignKey: 'fk_sequence_id',
});
};
return Bucket;
};
schema.js
# Sequence
type Sequence {
id: Int!,
code: String,
buckets: [Bucket],
is_active: Boolean
}
# Bucket
type Bucket {
id: Int!,
code: String
blocks: [Block]
is_active: Boolean
}
# SequenceInput
input SequenceInput {
buckets: [BucketInput],
is_active: Boolean
}
# BucketInput
input BucketInput {
code: String,
fk_language_id: Int,
fk_sequence_id: Int,
is_active: Boolean
}
type Query {
sequences: [Sequence]
sequence(id: Int): Sequence
buckets: [Bucket]
bucket(id: Int): Bucket
}
type Mutation {
createSequence(input: SequenceInput): Sequence,
}
要求GraphQL
mutation {
createSequence(input: {
is_active: false,
buckets: [
{fk_language_id: 2, code: "Test"}
]
}) {
is_active,
buckets {
id,
code
}
}
}
但是我有这个结果,Buckets没有加载:
{
"data": {
"createSequence": {
"is_active": false,
"buckets": []
}
}
}
我的突变:
...
Sequence : {
buckets(sequence) {
return models.Bucket.findAll({
where: {id: sequence.id}
});
},
...
},
...
Mutation : {
createSequence(_, {input}) {
let sequenceId = 0;
// Create Sequence
return models.Sequence.create(input)
.then((sequence) => {
sequenceId = sequence.id;
console.log('sequence created');
// Create Bucket
// Foreach on buckets
return Promise.map(input.buckets, function (bucket) {
bucket.fk_sequence_id = sequenceId;
console.log('bucket created');
return models.Bucket.create(bucket);
})
})
.then(() => {
console.log('load created', sequenceId);
return models.Sequence.findOne({
where : {id: sequenceId},
include: [
{
model: models.Bucket,
where: { fk_sequence_id: sequenceId }
}
]
}).then((response) => {
console.log(response);
return response;
})
});
},
}
最终的console.log显示许多信息...
sequence {
dataValues:
{ id: 416,
is_active: false,
created_at: 2019-03-29T20:33:56.196Z,
updated_at: 2019-03-29T20:33:56.196Z,
buckets: [ [Object] ] },
_previousDataValues:
{ id: 416,
is_active: false,
created_at: 2019-03-29T20:33:56.196Z,
updated_at: 2019-03-29T20:33:56.196Z,
buckets: [ [Object] ] },
_changed: {},
_modelOptions:
{ timestamps: true,
validate: {},
freezeTableName: true,
underscored: false,
paranoid: false,
rejectOnEmpty: false,
whereCollection: { id: 416 },
schema: null,
schemaDelimiter: '',
defaultScope: {},
scopes: {},
indexes: [],
name: { plural: 'sequences', singular: 'sequence' },
omitNull: false,
createdAt: 'created_at',
updatedAt: 'updated_at',
sequelize:
Sequelize {
options: [Object],
config: [Object],
dialect: [Object],
queryInterface: [Object],
models: [Object],
modelManager: [Object],
connectionManager: [Object],
importCache: [Object],
test: [Object] },
hooks: {} },
_options:
{ isNewRecord: false,
_schema: null,
_schemaDelimiter: '',
include: [ [Object] ],
includeNames: [ 'buckets' ],
includeMap: { buckets: [Object] },
includeValidated: true,
attributes: [ 'id', 'is_active', 'created_at', 'updated_at' ],
raw: true },
isNewRecord: false,
buckets:
[ bucket {
dataValues: [Object],
_previousDataValues: [Object],
_changed: {},
_modelOptions: [Object],
_options: [Object],
isNewRecord: false } ] }
您的突变解析器返回一个Promise,该Promise解析为Model实例。 有问题的诺言在以下行中返回:
return models.Sequence.create(input)
。
这样,服务器将等待该承诺得到解决,然后再传递值。 其他行动也正在等待该承诺,但是它们不是承诺的返回,因此不会等待它们。
您要做的就是等待所有操作完成,然后再兑现您的承诺。
createSequence: async (parent, { input }) => {
const sequence = await models.Sequence.create({
is_active: input.is_active
})
if (!input.buckets) return sequence
// You may have to modify your Sequence.buckets resolver to avoid fetching buckets again.
sequence.buckets = await Promise.all(input.buckets.map(bucket => {
// You can avoid these if checks by implementing stricter input types.
// e.g. buckets: [BucketInput!]!
if (!bucket) return null
return models.Bucket.create({
...bucket,
fk_sequence_id: sequence.id
})
}))
return sequence
}
另外,请确保您的Sequence.buckets
解析程序不会用错误的数据覆盖存储桶。 您提供的解析器将尝试将存储桶主键与序列主键匹配,而不是将正确的外键与主键匹配。
这是一个可以使用的解析器:
buckets: (parent) => (
parent.buckets // This line may conflict with some of your code and cause problems.
|| models.Bucket.findAll({
where: {fk_sequence_id: parent.id}
})
)
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