user table and role table have many-to-many relationship, and the middle table is user_roles. many-to-many relationships are defined in the user model class public function relRole(){ return $this->belongsToMany( App Model Role , ...
I just started to learn the association model of laravel, and I was so confused that sometimes I really felt that it was not as convenient as writing sql directly. now there is a problem role tables admin_roles and admin_permissions tables have a man...
when using larave s gate for permission verification Admin_users (user table) Admin_roles (role table) Admin_permissions (permissions table) are many-to-many relationships first, register gate in App providers AuthServiceProvider $permissions=Admin...
version: laravel 5.7 when using the $appends attribute of the model modifier to add elements and using faker to generate false data, an error is reported: Unknown column sex_str Model related code: $factory->define( App Models User::cl...
class products (models.Model): MODE_CHOICES=(( week , ),( day , )) productname=models.CharField(max_length=30,unique=True) dutymode=models.CharField(max_length=30,choices=MODE_CHOICES,default= week ) class dutygroups (models.Model): pro...
what is the meaning of the "training algorithm " in the figure below? For example, the KNN algorithm mentioned below is not a function, something determined by routines? Why train? ...
problem description for example, I now have the following array var a = [1, 2, 5, 3, 5, 5, 6, 8, 9]; I want to arrange the circular output in the order of 1, 2, 3 4, 5, 6 7, 8, 9 the environmental background of the problems and what methods you...
php $output = shell_exec( python D: test.py ); Python test.py from os import startfile -sharp path = D: Wildlife.wmv startfile(path) the video is not played when the php file is called, but I can execute python test.py with th...
ask, the upload component of iview, how to cancel the upload of a file while it is being uploaded ...
<el-select v-model="value" @change="currentSel" placeholder=""> <el-option v-for="item in options1" :key="item.value" :label="item.parentId" :value="item.labelName"&g...
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0"> &...