model | 易学教程

In Laravel, how do I retrieve a random user_id from the Users table for Model Factory seeding data generation?

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问题 Currently, in my ModelFactory.php, I have: $factory->define(App\Reply::class, function (Faker\Generator $faker) { return [ 'thread_id' => 1, 'user_id' => 1, 'body' => $faker->paragraph ]; }); I would like to generate a random user_id from one of the user ID's already stored in the user table. I'm stumped because I don't know the way to display data output to code properly, and I was wondering how I would be able to allow Laravel to choose a random user ID and insert into the database. Thank

Alternative for Model.all - Model.where(condition)

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问题 My question is quiet simple: How to optimize the following query to not get performance issues once the database is growing: def projects_not_participating @project = Project.all - Project.joins(:participants).where(participant: {id: current_user.id}) end My model setup is this: def Project has_many :assignments has_many :participants, through: :assignments end def Participant has_many :assignments has_many :projects, through: assignments end I tried using Project.joins(:participant).where

Passing model values to views MVC 5

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问题 I am in need of how the correct way to do this. I can not use forms authentication A user will "login" or confirm identity based on a value I need to walk the user through a series of pages like so Contact/MailAddress Contact/Phone Contact/Email Contact/Summary Questionaire/Question1 Questionaire/Question2 Questionaire/Question3 Questionaire/Summary Final/Certify Final/Review I plan on using Session to hold the data but I'm having trouble figuring out how to pass the values to other views and

Why am I getting good accuracy but low ROC AUC for multiple models?

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问题 My dataset size is 42542 x 14 and I am trying to build different models like logistic regression, KNN, RF, Decision trees and compare the accuracies. I get a high accuracy but low ROC AUC for every model. The data has about 85% samples with target variable = 1 and 15% with target variable 0. I tried taking samples in order to handle this imbalance, but it still gives the same results. Coeffs for glm are as follow: glm(formula = loan_status ~ ., family = "binomial", data = lc_train) Deviance

keras save the model weights to one file

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问题 i have a keras model which save weights of each epoch how can i make to one file this is the line which saves the mode and i have 50 epoch i will get 50 weights which i want only 1 save all of them inside one file > model.save_weights('checkpoint_epoch_{}.hdf5'.format(k)) any idea what shall i do to save it in one file because i have to convert weights later to tensorflow model desiered weights checkpoint.h5 回答1: You don't need the weights in one file, you can save the whole model and use the

Get Laravel Models with All Attributes

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问题 Is there a way to retrieve a model in Laravel with all the attributes, even if they're null? It seems to only return a model with the attributes that aren't null. The reason for this is that I have a function that will update the model attributes from an array, if the attributes exists in the model. I use the property_exists() function to check the model if it has a particular attribute before setting it. The array key and model attribute are expected to match, so that's how it works. It

Get Laravel Models with All Attributes

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How to delete a model using php artisan?

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问题 Is there a command to safely delete a model in Laravel 5? To create a model we use php artisan make:model modelname And that will create a model under app folder, and also a migration in database/migrations But what I can't find is how to delete a model... 回答1: Deleting a model: just delete the model under App/ or whatever other folder. Deleting a migration: if you have migrated it (meaning the database has suffered changes) you have two choices: The "project starting"/ugly way is to migrate

Model and Query data in Firestore to get items in directories

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问题 I want to model data in firestore to get items in directories shared by several users (folders are secured with security rules). My current model is as follows: /folders/{folder}/folders/{subfolder} /folders/{folder}/items/{item} /folders/{folder}/folders/{subfolder}/items/{item} A user can access several folders and if he accesses the root folder he can also access the subfolders. He can also access subfolders (if he has permission) and his access to the root folder is restricted. The idea

QModelIndex/Role/Model介紹<二>

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QModelIndex/Role/Model介紹<二> Model类基本概念在model/view构架中，model为view和delegates使用数据提供了标准接口。在Qt中，标准接口QAbstractItemModel类中被定义。不管数据在底层以何种数据结构存储，QAabstractItemModel的子类会以层次结构的形式来表示数据，结构中包含了数据项表。我们按这种约定来访问model中的数据项，但这个约定不会对如何显示这些数据有任何限制。数据发生改变时，model通过信号槽机制来通知关联的views。 Model Indexes 为了使数据存储与数据访问分开，引入了model index的概念。通过model index，可以引用model中的数据项，Views和delegates都使用indexes来访问数据项，然后再显示出来。因此，只有model需要了解如何获取数据，被model管理的数据类型可以非常广泛地被定义。Model indexes包含一个指向创建它们的model的指针，这会在配合多个model工作时避免混乱。 QAbstractItemModel *model = index.model(); model indexes提供了对一项数据信息的临时引用，通过它可以访问或是修改model中的数据。既然model有时会重新组织内部的数据结构，这时model