简短版本：
我正在使用项目跟踪器模板中的代码发送显示字段状态更改的电子邮件（联系人姓名已更改：Billy - ＆gt; Susan）。
当我有一个Date而不是String的字段时，一切都完美无缺。如果我在代码中有一个Date字段，我会收到以下错误：
'string'值是模型'SystemOrdersHistory'中'NewValue'字段的预期值，但是找到了对象。错误：模型'SystemOrdersHistory'中'NewValue'字段的'string'值是预期的，但是找到了对象。在onSystemOrdersSave_（Datasources：218）models.SystemOrders.onSaveEvent：1
修改记录:(错误）：模型'SystemOrdersHistory'中的'NewValue'字段需要'string'值，但找到对象。
（错误）：模型'SystemOrdersHistory'中的'NewValue'字段需要'string'值，但找到对象。
非常感谢任何帮助！
长版
我正在使用下面的代码（调整为适合我的模型和字段的名称）。
每当我将一个Date字段（例如：DeliveryDate）添加到函数“notifyAboutItemChanges_”函数和“onSystemOrdersSave_”函数时，我会得到关于“期望一个字符串，但找到一个对象”的错误。
注意：“历史记录”模型中的OldValue和NewValue字段都是字符串。
通知服务器脚本：
/**
* Sends email.
* @param {!string} to - email address of a recipient.
* @param {!string} subject - subject of email message.
* @param {!string} body - body of email message.
*/
function sendEmail_(to, subject, body) {
try {
MailApp.sendEmail({
to: to,
subject: subject,
htmlBody: body,
noReply: true
});
} catch (e) {
// Suppressing errors in email sending because email notifications
// are not critical for the functioning of the app.
console.error(JSON.stringify(e));
}
}
/**
* Sends email notification about recent project item changes to item owner
* and assignee.
* @param {!Array<ItemHistory>} changes - list of recent project item changes.
*/
function notifyAboutItemChanges_(changes) {
if (!changes || changes.length < 2) {
return;
}
var settings = getAppSettingsRecord_()[0];
if (!settings.EnableEmailNotifications) {
return;
}
var data = {
appUrl: settings.AppUrl,
itemShowName: changes[0].ShowName,
itemUsersPosition: changes[0].UsersPosition,
itemDeliveryInfo: changes[0].DeliveryInfo,
itemDeliveryDate: changes[0].DeliveryDate,
itemKey: changes[0]._key,
itemName: changes[0].Name,
modifiedBy: changes[0].ModifiedBy,
changes: changes
};
// Email subject.
var subjectTemplate =
HtmlService.createTemplate(settings.NotificationEmailSubject);
subjectTemplate.data = data;
var subject = subjectTemplate.evaluate().getContent();
// Email body.
var emailTemplate =
HtmlService.createTemplate(settings.NotificationEmailBody);
emailTemplate.data = data;
var htmlBody = emailTemplate.evaluate().getContent();
sendEmail_('user@gmail.com', subject, htmlBody);
数据源服务器脚本：
/**
* Item key URL parameter.
*/
var ITEM_KEY = 'itemKey';
/**
* Checks that Application Settings record already exists.
* Otherwise creates a new one.
* @return {!Array<AppSettings>} app settings record as an array.
*/
function getAppSettingsRecord_() {
var newQuery = app.models.AppSettings.newQuery();
var settingsRecords = newQuery.run();
if (settingsRecords.length > 1) {
console.warn('There is more than one(%s) App Settings entries' +
'in the database', settingsRecords.length);
}
if (settingsRecords.length === 0) {
var settingsRecord = app.models.AppSettings.newRecord();
settingsRecord.AppUrl = ScriptApp.getService().getUrl();
settingsRecord.NotificationEmailSubject =
'A change has been made to <?= data.itemShowName?>: <?= data.itemUsersPosition?>';
settingsRecord.NotificationEmailBody =
'Hello!\n<br/>\n<p><b><?= data.modifiedBy ?></b> ' +
'made the following changes: </p>\n' +
'<? for (var i = 1; i < data.changes.length; i++) {\n' +
'\tvar change = data.changes[i]; ?>\n' +
'\t<b><?= change.FieldName ?>: </b>\n' +
'\t<? if (change.FieldName === "Comment") { ?>\n' +
'\t\t<div style="white-space: pre-line;"><?= change.NewValue ?></div>' +
'\n\t<? } else { ?>\n ' +
'\t\t<?= change.OldValue ?> → <?= change.NewValue ?>' +
'\n\t<? } ?>\n\t<br/>\n' +
'<? } ?>\n<br/>\n' +
'<a href="<?= data.appUrl ?>?' + ITEM_KEY + '=<?= data.itemKey ?>' +
'#EditItem" target="_blank">Go to the project item</a>';
app.saveRecords([settingsRecord]);
return [settingsRecord];
} else {
return settingsRecords;
}
}
/**
* Populates project record with required data on project create event.
* @param {!Project} project - project being created.
*/
function onProjectCreate_(project) {
var date = new Date();
project.CreatedDate = date;
project.ModifiedDate = date;
project.ModifiedBy = currentUserEmail_();
}
/**
* Audits project on changes.
* @param {!Project} project - project being modified.
*/
function onProjectSave_(project) {
project.ModifiedDate = new Date();
project.ModifiedBy = currentUserEmail_();
}
/**
* Populates project item with required data on item create event, adds
* comment entry to the project item history.
* @param {!SystemOrders} SystemOrders - project item being created.
*/
function onSystemOrdersCreate_(SystemOrders) {
var date = new Date();
var editor = currentUserEmail_();
if (SystemOrders.Comment) {
SystemOrders.Comment = SystemOrders.Comment.trim();
}
SystemOrders.CreatedDate = date;
SystemOrders.Owner = editor;
SystemOrders.ModifiedDate = date;
SystemOrders.ModifiedBy = editor;
if (SystemOrders.Comment) {
var history = app.models.SystemOrdersHistory.newRecord();
history.CreatedBy = currentUserEmail_();
history.CreatedDate = new Date();
history.FieldName = 'Comment';
history.NewValue = SystemOrders.Comment;
app.saveRecords([history]);
SystemOrders.History.push(history);
}
}
/**
* Calculates history entries sum for {Array<SystemOrders>}.
* @param {!number} historySum - the accumulated number of history entries
* previously returned in the last invocation of the callback, or
* initialValue, if supplied.
* @param {!SystemOrders} SystemOrders - the current {SystemOrders} being
* processed in the array.
* @return {!number} history entries sum.
*/
function sumHistory_(historySum, SystemOrders) {
return historySum + SystemOrders.History.length;
}
/**
* Calculates potential project deletion impact.
* Throws an error if there is no project with the key provided.
* @param {!string} projectKey - project key to calculate deletion impact.
*/
function getDeleteProjectImpact(projectKey) {
var projectQuery = app.models.Project.newQuery();
projectQuery.prefetch.Items._add();
projectQuery.prefetch.Items.History._add();
projectQuery.filters._key._equals = projectKey;
var projects = projectQuery.run();
if (projects.length === 0) {
throw new Error('Project with key ' + projectKey + ' was not found.');
}
var SystemOrderss = projects[0].Items;
return {
affectedItems: SystemOrderss.length,
affectedHistory: SystemOrderss.reduce(sumHistory_, 0)
};
}
/**
* Checks that project item readonly fields were not modified.
* Throws an error if user attempts to modify read only fields.
* @param {!SystemOrders} record - modified project item.
* @param {!SystemOrders} oldRecord - project item before modification.
*/
function validateItemChange_(record, oldRecord) {
var readonlyFields = [
'CreatedDate',
'ModifiedBy',
'ModifiedDate',
'Owner'
];
for (var i = 0; i < readonlyFields.length; i++) {
var field = readonlyFields[i];
var newValue = record[field];
var oldValue = oldRecord[field];
var isDate = newValue instanceof Date && oldValue instanceof Date;
if (isDate === true) {
newValue = record[field].getDate();
oldValue = oldRecord[field].getDate();
}
if (newValue === oldValue) {
continue;
}
throw new Error(field + ' field is read only');
}
}
/**
* Handles project item change event, creates history entries for each changed
* field.
* @param {!SystemOrders} record - modified project item.
* @param {!SystemOrders} oldRecord - project item before modification.
*/
function onSystemOrdersSave_(record, oldRecord) {
validateItemChange_(record, oldRecord);
var editableFields = [
'ShowName',
'UsersPosition',
'DeliveryInfo',
'DeliveryDate'
];
var editor = currentUserEmail_();
var date = new Date();
var changes = [record];
record.ModifiedBy = editor;
record.ModifiedDate = date;
for (var i = 0; i < editableFields.length; i++) {
var field = editableFields[i];
var newValue = record[field];
var oldValue = oldRecord[field];
if (newValue !== oldValue) {
var history = app.models.SystemOrdersHistory.newRecord();
history.Item = record;
history.CreatedBy = editor;
history.CreatedDate = date;
history.FieldName = field;
history.NewValue = newValue;
history.OldValue = oldValue;
changes.push(history);
}
}
app.saveRecords(changes);
notifyAboutItemChanges_(changes);
}
/**
* Counts project items by some grouping criteria(field).
* @param {!string} projectKey - project key to calculate stats.
* @param {!string} grouping - project item field to group items by.
* @param {!Array<string>} groupingValues - possible field values.
* @return {!Array<SystemOrderssBreakdown>} grouped project items counts.
*/
function getSystemOrderssBreakdown_(projectKey, grouping, groupingValues) {
if (!grouping || !groupingValues || groupingValues.length === 0) {
return [];
}
var itemsQuery = app.models.SystemOrders.newQuery();
itemsQuery.prefetch.Project._add();
itemsQuery.filters.Project._key._equals = projectKey;
var items = itemsQuery.run();
if (items.length === 0) {
return [];
}
var records = [];
var map = {};
for (var i = 0; i < items.length; i++) {
var itemGrouping = items[i][grouping];
if (!map[itemGrouping]) {
map[itemGrouping] = 0;
}
map[itemGrouping]++;
}
for (i = 0; i < groupingValues.length; i++) {
var breakdownRecord = app.models.SystemOrderssBreakdown.newRecord();
var groupingValue = groupingValues[i];
breakdownRecord.Grouping = groupingValue;
breakdownRecord.ItemsCount = map[groupingValue] || 0;
records.push(breakdownRecord);
}
return records;
}
答案 0 :(得分：3)
它在这里失败了：
// history.NewValue and history.OldValue are strings
// newValue and oldValue can be of any type (Boolean, Number, Date,
// but not a relation as of now)
// You are getting an exception because you are not casting types
history.NewValue = newValue;
history.OldValue = oldValue;
您可以通过向历史模型添加每种可能类型的字段来修复它（NewStringValue，NewDateValue，NewBoolValue，NewNumberValue，OldStringValue ...）。通过这种方法，您可以获得强类型的好处，但您的代码和UI将变得更加复杂......
您可以存储所有字段＆＃39;历史作为字符串（就像你现在所做的那样），但在这种情况下，你需要提前考虑格式化和本地化：
function fieldToString(field, fieldValue) {
// TODO: pass field metadata to individually handle
// different data types.
return fieldValue !== null ? fieldValue.toString() : null;
}
...
history.NewValue = fieldToString(field, newValue);
history.OldValue = fieldToString(field, oldValue);
...