model

问题 I need to save a dictionary in a model's field. How do I do that? For example I have this code: def create_random_bill(self): name_chars = re.compile("[a-zA-Z0-9 -_]") bill_name = "".join(random.choice(name_chars for x in range(10))) rand_products = random.randint(1,100) for x in rand_products: bill_products = new_bill = Bill.new(name=bill_name, date=datetime.date, products=bill_products) new_bill.save() What do I write for "bill_products=" so it saves some random products, from my Product

问题 I know it could be bad to use domain models as view models. If my domain model has a property named IsAdmin and I have a Create controller action to create users, someone could alter my form and get it to POST a IsAdmin=true form value, even if I did not expose such a text field in my view. If I'm using model binding then when I committed my domain model, that person would now be an admin. So the solution becomes exposing just the properties I need in the view model and using a tool like

问题 I know it could be bad to use domain models as view models. If my domain model has a property named IsAdmin and I have a Create controller action to create users, someone could alter my form and get it to POST a IsAdmin=true form value, even if I did not expose such a text field in my view. If I'm using model binding then when I committed my domain model, that person would now be an admin. So the solution becomes exposing just the properties I need in the view model and using a tool like

问题 Relatively new to rails and trying to model a very simple family "tree" with a single Person model that has a name, gender, father_id and mother_id (2 parents). Below is basically what I want to do, but obviously I can't repeat the :children in a has_many (the first gets overwritten). class Person < ActiveRecord::Base belongs_to :father, :class_name => 'Person' belongs_to :mother, :class_name => 'Person' has_many :children, :class_name => 'Person', :foreign_key => 'mother_id' has_many

问题 Relatively new to rails and trying to model a very simple family "tree" with a single Person model that has a name, gender, father_id and mother_id (2 parents). Below is basically what I want to do, but obviously I can't repeat the :children in a has_many (the first gets overwritten). class Person < ActiveRecord::Base belongs_to :father, :class_name => 'Person' belongs_to :mother, :class_name => 'Person' has_many :children, :class_name => 'Person', :foreign_key => 'mother_id' has_many

问题 I want to use JavaFX properties for UI binding, but I don't want them in my model classes (see Using javafx.beans properties in model classes). My model classes have getters and setters, and I want to create properties based on those. For example, assuming an instance bean with methods String getName() and setName(String name) , I would write SimpleStringProperty property = new SimpleStringProperty(bean, "name") expecting that property.set("Foobar") would trigger a call to bean.setName . But

问题 I want to use JavaFX properties for UI binding, but I don't want them in my model classes (see Using javafx.beans properties in model classes). My model classes have getters and setters, and I want to create properties based on those. For example, assuming an instance bean with methods String getName() and setName(String name) , I would write SimpleStringProperty property = new SimpleStringProperty(bean, "name") expecting that property.set("Foobar") would trigger a call to bean.setName . But

问题 So I have this issue. I have 2 field is Date of birth and Start working date .I want to apply custom validation following this if start working date - date of birth is >= 22 then is valid.So here is my code [AttributeUsage(AttributeTargets.Property)] public class MiniumAgeAttribute:ValidationAttribute { private DateTime dob { get; set; } private DateTime startDate { get; set; } public MiniumAgeAttribute(DateTime DOB, DateTime StartDate) { dob = DOB; startDate = StartDate; } protected override

问题 I get this error message: TS2339: Property 'ITEMS' does not exist on type 'DataModel[]' I'm working in IONIC/ANGULAR and doing a reactive Form with a model and getting data from HTTP. There is the model (model.ts): export class DataModel { public ITEMS: any[]; constructor(public NAME: string, public QUANTITY: Array<string>) { this.ITEMS = [{NAME, QUANTITY}]; } } There is the code part where the error come from of the form.page.ts setItems() { const control = this.itemsForm.controls.items as

问题 I get this error message: TS2339: Property 'ITEMS' does not exist on type 'DataModel[]' I'm working in IONIC/ANGULAR and doing a reactive Form with a model and getting data from HTTP. There is the model (model.ts): export class DataModel { public ITEMS: any[]; constructor(public NAME: string, public QUANTITY: Array<string>) { this.ITEMS = [{NAME, QUANTITY}]; } } There is the code part where the error come from of the form.page.ts setItems() { const control = this.itemsForm.controls.items as