one-to-many

问题 I have tried to search online for a definite solution to this question but there's really no concrete solution for newbies out there. I have an Entry which has many EntryListing. In my EntryAdmin listMapper, i comfortably can list entries by a statement as simple as ->add('listings') which simply returns the listings as defined in the EntryListing __toString() function. Is there a way to achieve the same when exporting the data by overiding the getExportFields() functions as below: public

问题 Typical usage scenario: I have master, branch_foo and branch_bar. All are up to date. Now, I do a "git checkout master" and work on a bug fix. Lets say that fix was on a tracked file that is in the same state on all branches - ie. before the fix, a diff of the file from each branch results in no differences. Is there a way to commit this fix to all branches? 回答1: I expect git cherry-pick is what you want. After committing the fix to the first branch, you can use git cherry-pick to merge it

问题 I have two entities, an entity "movie" and an entity "Clip" each clip belongs to one movie and a movie can have multiple clips. My code looks like: Movie.java @OneToMany(mappedBy = "movie", targetEntity = Clip.class, cascade = CascadeType.ALL, fetch = FetchType.EAGER) private Set<Clip> clips = new HashSet<Clip>(); Clip.java @ManyToOne @JoinColumn(name="movie_id") private Movie movie; The tables are being generated and each Clip has a column "movie_id" but this causes my application to end up

问题 There is a nice explanation of 1-to-many relationships in datastore here by Rafe Kaplan. I tried to adapt that to a simpler case of User and Venue . So user can go to many restaurants; and I want to print the user email and the restaurants the user went to: class User(db.Model): userEmail = db.StringProperty() class Venue(db.Model): user = db.ReferenceProperty(User, collection_name="venues") venue = db.StringProperty() class OneToMany(webapp.RequestHandler): def get(self): scott = User

问题 I'm working on a Java project using JPA 2 + Hibernate 4.2.6 and I'm getting a strange behaviour. In my model I have two related entites: Question and Answer @Entity public class Question { // ... @OneToMany(mappedBy = "question", cascade = CascadeType.ALL, fetch = FetchType.EAGER) private Set<Answer> answers; // ... } @Entity public class Answer { // ... @ManyToOne(optional = false) @JoinColumn(name = "question_id", nullable = false) private Question question; // ... } This works perfectly:

问题 I just don't understand why Hibernate throws exception mentioned in title. I probably don't understand state management idea behind Hibernate. I have following situation: One-to-many relation between Organization and Employee Organization.hmb.xml <set name="employees" inverse="true" cascade="save-update"> <key column="organization_id"/> <one-to-many class="Employee"/> </set> Employee.hbm.xml <many-to-one name="organization" class="Organization" column="organization_id" /> I use standard

问题 I'm starting to use AutoMapper for my project. For this I want to do the following 'one-to-many' mapping: Source: public class Team { int Id { get; set; } string TeamName { get; set; } List<Person> Member { get; set; } } public class Person { int Id { get; set; } string Name { get; set; } } Destination: public class TeamDetailsViewModel { int Id { get; set; } string TeamName { get; set; } List<int> MemberIds { get; set; } } How to proceed with AutoMapper? Is this possible? Thanks a lot in

问题 I have two tables, in PostgreSQL if that matters, with one to many relations. I need to join them so that for each "one" I only get single result from the "many" table. Not only that but I need to single out specific results from the "many" table. TABLE_A ID | NAME | DATE | MORE COLS.... 1 | JOHN | 2012-01-10 | .... 2 | LIZA | 2012-01-10 | .... 3 | ANNY | 2012-01-10 | .... 4 | JAMES | 2012-01-10 | .... ... TABLE_B ID | CODE1 | CODE2 | SORT 1 | 04020 | 85003 | 1 1 | 04030 | 85002 | 4 2 | 81000

问题 I'm have a problem embedding forms from different entities in one form, my form is being displayed with firstname [input] lastname [input] address - but the address has no input next to it. Basically I want to create a form where the user can add first name, last name, address1, address2, city, country ect and submit it it as one, although it's different tables. The main form is no problem the only issue I'm having is with the second embedded form. Any help would be greatly appreciated. Here

问题 I have following two classes and corresponding db tables. I am trying to insert the full object graph (student with multiple courses). I am looking for an example on how would one do this using Dapper. The Id's are auto-increment identity fields. Class public class Student { public int Id {get;set;} public string Name {get;set;} public IEnumerable<Course> Courses {get;set;} } public class Course { public int Id {get;set;} public string Name {get;set;} } Table Student Id [int] (pk) Name