Make join from 2 tables in Active Data Provider - php

Question

I have 2 tables:User and Posts. User can have many posts,post can't have many users. How to build relations in that models and how to make Join in ActiveDataProvider I have user_id in my Posts table and want to show data in my gridview like Posts(id,title,text) and User(name) how can I do that?I need to make relations in my model and how can I use it?;
Posts model:
<?php
namespace app\models;
use Yii;
/**
* This is the model class for table "posts".
*
* #property integer $id
* #property integer $user_id
* #property string $post_title
* #property string $post_text
*/
class Posts extends \yii\db\ActiveRecord
{
/**
* #inheritdoc
*/
public static function tableName()
{
return 'posts';
}
/**
* #inheritdoc
*/
public function rules()
{
return [
[['user_id'], 'integer'],
[['post_title'], 'string', 'max' => 50],
[['post_text'], 'string', 'max' => 255],
];
}
/**
* #inheritdoc
*/
public function attributeLabels()
{
return [
'id' => 'ID',
'user_id' => 'User ID',
'post_title' => 'Post Title',
'post_text' => 'Post Text',
];
}
public function insertPost()
{
$userId = \Yii::$app->user->identity->id;
$posts = new Posts();
$posts->user_id = $userId;
$posts->post_title = $this->post_title;
$posts->post_text = $this->post_text;
return $posts->save();
}
public function getUser()
{
return $this->hasOne(User::classname(),['user_id'=>'id']);
}
}
User model:
* #property integer $id
* #property string $email
* #property string $password
* #property string $name
*/
class User extends \yii\db\ActiveRecord
{
/**
* #inheritdoc
*/
public static function tableName()
{
return 'user';
}
/**
* #inheritdoc
*/
public function rules()
{
return [
[['email'], 'string', 'max' => 100],
[['password'], 'string', 'max' => 255],
[['name'], 'string', 'max' => 25],
];
}
/**
* #inheritdoc
*/
public function attributeLabels()
{
return [
'id' => 'ID',
'email' => 'Email',
'password' => 'Password',
'name' => 'Name',
];
}
public function setPassword($password)
{
$this->password = sha1($password);
}
public function validatePassword($password)
{
return $this->password === sha1($password);
}
public static function findIdentity($id)
{
return self::findOne($id);
}
public static function findIdentityByAccessToken($token, $type = null)
{
}
public function getId()
{
return $this->id;
}
public function getAuthKey()
{
}
public function validateAuthKey($authKey)
{
}
public function getPost()
{
return $this->hasMany(Posts::classname(),['id'=>'user_id']);
}
}

Answer 1

You already have a relation (your function getPost ) in User model between User and Post
you can access the the value of Post eg:
$userModel = User::find()->where([ 'id' => $id])->one();
$myUserPost = $userModel->post;
$myUserPostAttribute = $userModel->post->attribute;
for ActiveDataProvider you can use
$dataProvider = User::find()->where([ 'id' => $id]);
and eventually add getter for single attribute in User Model eg:
getMyPostAttribute1()
{
return $this->post->attribute1
}
so you can easly use this getter in a gridview
<?= GridView::widget([
'dataProvider' => $dataProvider,
......
'columns' => [
['class' => 'yii\grid\SerialColumn'],
'myPostAttribute1',
....