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可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I'm building a Mongoose schema for a dating app. I want each person document to contain a reference to all the events they've been to, where events is another schema with its own models in the system. How can I describe this in the schema? var personSchema = mongoose.Schema({ firstname: String, lastname: String, email: String, gender: {type: String, enum: ["Male", "Female"]} dob: Date, city: String, interests: [interestsSchema], eventsAttended: ??? }); 回答1: You can describe it by using Population Population is the process of automatically

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I am using the [Required] attribute for the client-side validation in ASP.NET MVC 3. The class looks as: public class User { [Required(ErrorMessage = "First Name is required")] public string FirstName { get; set; } } I want the field FirstName to be validated only if it's visible, which will be shown only on certain conditions. How can I do that? I have used the following, but still it looks to validate for the required field of that hidden field. $('#registerForm').validate({ ignore: ":not(:visible)" }); 回答1: With some useful hints from

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I have this model public class Person { public int Id { get; set; } public string FirstName { get; set; } public string LastName { get; set; } } I want to create a validation where either FirstName or LastName must be filled in by user. I installed FluentValidation and created a customvalidator class public class PersonValidator:AbstractValidator<Person> { public PersonValidator() { RuleFor((person=>person.FirstName)//don't know how to check if one is empty } } To check just one field I could just do RuleFor(person => person.FirstName)

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I want to be able to copy a custom class in Swift. So far, so good. In Objective-C I just had to implement the NSCopying protocol, which means implementing copyWithZone . As an example, I have a basic class called Value which stores a NSDecimalNumber . func copyWithZone(zone: NSZone) -> AnyObject! { return Value(value: value.copy() as NSDecimalNumber) } In Objective-C I, could easily just call copy to copy my object. In Swift, there seems to be no way to call copy . Do I really need to call copyWithZone even if no zone is needed? And which

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I've tried on a few different forums and can't seem to get a straight answer, how can I make this function return the struct? If I try 'return newStudent;' I get the error 'No suitable user-defined conversion from studentType to studentType exists.' // Input function studentType newStudent() { struct studentType { string studentID; string firstName; string lastName; string subjectName; string courseGrade; int arrayMarks[4]; double avgMarks; } newStudent; cout << "\nPlease enter student information:\n"; cout << "\nFirst Name: "; cin >>

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: My INSERT statement apparently has a syntax error. Could someone please explain why that might be? Private Sub Register_Click_1(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Register.Click Dim StudentNum As String Dim Password As String Dim FirstName As String Dim LastName As String Dim YrandSec As String StudentNum = Number.Text() Password = Pass.Text FirstName = First.Text LastName = Last.Text YrandSec = YrSec.Text() SQL = "INSERT INTO Accounts(StudNo,Password,FirstName,LastName,YrandSec) VALUES ('" & StudentNum & "',

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I need to export customer records from database of mongoDB. Exported customer records should not have duplicated values. "firstName+lastName+code" is the key to DE-duped the record and If there are two records present in database with same key then I need to give preference to source field with value other than email. customer ( id,firstName,lastName,code,source ) collection is this. If there are record 3 records with same unique key and 3 different sources then i need to choose only one record between 2 sources(TV,internet){or if there are

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I have C# (WPF) application where I want to display a SSRS report in the ReportViewer control. The local report file has XML datasource embedded in it. The report is displayed correctly when running from SQL Server Business Intelligence Development Studio. But when I run with my app I get the following error: A data source instance has not been supplied for the data source '...'. So here is what I'm doing: I have defined embedded XML data, as explained in this tutorial Defining a Report Dataset from Embedded XML Data . I have a data source

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: This question already has an answer here: ADD SQL QUERY STAT 1 answer I'm trying to update an Access database using a SQL query, whenever I click the save button, it generates an error An unhandled exception of type 'System.Data.OleDb.OleDbException' occurred in System.Data.dll Additional information: No value given for one or more required parameters. And highlights .ExecuteNonQuery() . Can you guys help me on this? I'm new to vb.net. Thanks in advance. Private Sub SaveButton_Click(sender As Object, e As EventArgs) Handles SaveButton.Click

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I have a custom class like Person: public class Person { int age; String name; } Now I want to sort Person class objects based on age . So I will use Comparable interface and implement compareTo() method. And compareTo will have logic to compare person object based on just age . So if I do : Collections.sort(list); // where list is a list of person I will get sorted person list based on age . But I read somewhere, we need to override equals() method as well when we do Comparable implementation. But I am not seeing its use as of now. Can