我有一个来自google people api的承诺。在两个元素上工作得很好的映射和过滤器,但在第三个元素上给出了一个未定义的错误,在我看来是一样的。
在过去的两个小时里,我阅读了地图上的所有信息,并进行了有根据的猜测。这两种方法似乎都没有促进我的努力。
资源库、名称库和电子邮件库都有效。性别密码失败。
const arr = this.k4kItems.map(item => ({
resource_LBL: item.person.resourceName,
names_lbl: item.person.names.filter(
name_PARM => name_PARM.metadata.source.type === "CONTACT"
),
email_LBL: item.person.emailAddresses.filter(
email_PARM => email_PARM.metadata.source.type === "CONTACT"
),
gender_LBL: item.person.genders.filter(
gender_PARM => gender_PARM.metadata.source.type === "CONTACT"
)
}))
下面是json.stringify(promise)的相关元素或承诺。
"person": {
"resourceName": "people\/c224283231105155344",
"names": [
{
"metadata": {
"primary": true,
"source": {
"type": "CONTACT",
"id": "31cd0690f198110"
}
},
"displayName": "Armena Kopf",
"familyName": "Kopf",
"givenName": "Armena",
"displayNameLastFirst": "Kopf, Armena"
},
{
"metadata": {
"source": {
"type": "PROFILE",
"id": "112242108723070860293"
}
},
"displayName": "Armena Dickson",
"familyName": "Dickson",
"givenName": "Armena",
"displayNameLastFirst": "Dickson, Armena"
}
],
"genders": [
{
"metadata": {
"primary": true,
"source": {
"type": "CONTACT",
"id": "31cd0690f198110"
}
},
"value": "female",
"formattedValue": "Female"
},
{
"metadata": {
"source": {
"type": "PROFILE",
"id": "112242108723070860293"
}
},
"value": "female",
"formattedValue": "Female"
}
],
"emailAddresses": [
{
"metadata": {
"primary": true,
"source": {
"type": "CONTACT",
"id": "31cd0690f198110"
}
},
"value": "armena_d@yahoo.com",
"type": "home",
"formattedType": "Home"
}
]
预期的结果是性别将映射到数组,而不是给出未定义的错误。
最佳答案
只需添加存在不存在的深层属性的检查
gender_LBL: item.person.genders && item.person.genders.filter(
gender_PARM => gender_PARM.metadata.source.type === "CONTACT"
)