relationship

来源： https://stackoverflow.com/questions/18602198/d3-js-how-do-i-draw-and-highlight-links-in-this-relationship-graph

问题 I'm stuck with a problem where I have to sort / order a collection of models by their relationship's data. I've got it setup like this: Models: User , Team , TeamUser , Role The TeamUser model is a pivot model / table (containing user_id and team_id . If it's worth mentioning I am also using spatie/laravel-permissions for the roles. How would I go forth when I want to sort the users in a team by their role.name ? I'm talking about the users() relation in the Team model (see further down for

问题 I'm trying to build an example with several related models, like the following. We have a model B with a 1:n relation with a model C; then we have a model A with a n:1 relation with B and a n:1 relation with C. (C has a 2-columns primary key) I tried this code: class C(db.Model): __tablename__ = 'C' key1 = Column(Integer, primary_key=True) key2 = Column(Integer, primary_key=True) attr1 = Column(Date) attr2 = Column(Boolean) related_b = Column(Integer, ForeignKey('B.spam')) class B(db.Model):

问题 I've defined the following two odoo ORM models: class Weekday(models.Model): _name = 'ludwik.offers.weekday' name = fields.Char() class Duration(models.Model): _name = 'ludwik.offers.duration' weekday = fields.Many2many('ludwik.offers.weekday') When I try to start odoo I get the following message: ProgrammingError: relation "ludwik_offers_duration_ludwik_offers_weekday_rel_ludwik_offers_" already exists Also, when I change the _name properties in models, the problem persists (of course the

问题 I've defined the following two odoo ORM models: class Weekday(models.Model): _name = 'ludwik.offers.weekday' name = fields.Char() class Duration(models.Model): _name = 'ludwik.offers.duration' weekday = fields.Many2many('ludwik.offers.weekday') When I try to start odoo I get the following message: ProgrammingError: relation "ludwik_offers_duration_ludwik_offers_weekday_rel_ludwik_offers_" already exists Also, when I change the _name properties in models, the problem persists (of course the

问题 I have a problem when access data who has relationship. Below this syntax is work properly: $student = \App\StudentRegistrars::find($id); foreach($student->father_registrars as $getFatherData) { $fatherID = $getFatherData->id; $specificFather = \App\FatherRegistrars::where('id', $fatherID); $specificFather->update(['status' => 'Pending']); //count qualified students who have father with id $fatherID $getSelectedStudent = \App\StudentRegistrars::where('status', 'Qualified')->whereHas('father

问题 I am trying to understand solution on one exercise that translates ER model to functional dependencies. As you can see above, we only have relation names and nothing else besides that, and by solution, they somehow come up to conclusion that mother, daughter → father father, daughter → mother mother, son → father father, son → mother And that moreover we can infer additional f dependencies to represent real world more accurately: mother, son → father father, son → mother What I don't

问题 I'm trying to figure out what I can possibly be doing wrong (or, of course, misunderstood about relationships, fetches and all). In a first search, when I read the question's title, I hoped this question could help me, but I was wrong: SwiftUI TabView with List not refreshing after objected deleted from / added to Core Data Anyway... In my app, when I touch a customer item, the detail view is shown properly with its data. If I change any attribute and go back to the first view, its updated

问题 simply this code is my get data solution, this models are relationships and my result is true but i can't get data from relationship and show that on view, for example; $data = UserAccountNumber::with(['currency_type'])->orderBy('id', 'DESC')->paginate(50); this code return below result: LengthAwarePaginator {#585 ▼ #total: 2 #lastPage: 1 #items: Collection {#601 ▼ #items: array:2 [▼ 0 => UserAccountNumber {#588 ▶} 1 => UserAccountNumber {#589 ▼ #table: "user_account_numbers" #guarded: array

问题 I have asked reference question in this link.I got answer using NSMangedObjectID.Now I have used below function to get Component entity from its componentID.As in the API response of SyncSurveyWebReadings,I only get componentId,I need to fetch Component entity & set as relationship.Now time taking issue is not there.But may be relationship is not getting set.When I print the relationship object I got, Optional<Array<SurveyReadingWeb>> ▿ some : 1 element - 0 : <GazSurvey_Dev.SurveyReadingWeb: