I am trying to determine the database relationship , for the following tables:
posts
======
id
type_id
title
content
posts_type
==========
id
type_name
Where type_id and posts_type (id) is the same , where each post ganna have ONLY one type,
how do I define this in Laravel is it one to one relationship?
Thanks
You can use a One-To-Many relationship, for example:
Model PostType:
class PostType extends Eloquent {
protected $table = 'posts_type';
public function posts()
{
return $this->hasMany('Post', 'type_id', 'id');
}
}
// Get PostType (whereId=1) with all related posts
$postType = PostType::with('posts')->find(1);
Model Post:
class Post extends Eloquent {
protected $table = 'posts'; // Optional
public function postType()
{
return $this->belongs('PostType', 'type_id', 'id');
}
}
// Get Post (whereId=1) with it's related PostType
$post = Post::with('postType')->find(1);
Related
I am trying to retrieve value from foreign key table with one to one relation. I have defined two models:
1. Blog
class Blog extends Model
{
//
protected $table = 'blogs';
public function blog_category()
{
return $this->hasOne('App\Blog_Category');
}
}
2. Blog Category
class Blog_Category extends Model
{
//
protected $table=('blogs_categories');
public function blog()
{
return $this->belongsTo('App\Blog');
}
}
I have got blogs_categoryid in blogs table that has been referenced to id from blogs_categories table.
I have tried following:
{{$blog->blogs_categoryid->category}}
But it is showing "trying to get property of non-object". What is going wrong here? Can anyone help me?
Blog model content should be:
class Blog extends Model
{
protected $table = 'blogs';
public function blog_category()
{
return $this->hasOne('App\Blog_Category', 'blogs_categoryid');
}
}
Then use with when you want it to query relation table:
$blog = Blog::with('blog_category')->get();
$categoryObject = $blog->blog_category;
$categoryId = $categoryObject->id;
I have 3 models objects, namely: Categories, Category_products & Products
Categories:
<?php
class Categories extends Model
{
protected $table = 'categories';
public function product_ids() {
return $this->hasMany("app\Models\categories\Category_products", "category_id", "id");
}
?>
Category_products:
<?php
class Category_products extends Model
{
protected $table = 'category_products';
public function product_ids(){
return $this->belongsTo('app\Models\categories\Category');
}
public function products(){
return $this->hasOne("app\Models\Product", "id", "product_id");
}
}
?>
And Product:
<?php
class Product extends Model {
protected $table = 'products';
public function product(){
return $this->belongsTo("app\Models\categories\Category_products");
}
?>
Now in my CategoryController I do:
$this->data["products"] = Categories::find($id)->product_ids()->products()->get();
But now I get an error :
Call to undefined method Illuminate\Database\Query\Builder::products()
How can I do this the right way ?
OK, I'm going to try.
I guess you missed something when reading the Laravel documentation.
You don't have to create the category_products Models because it's your pivot table between your Categories and your Product.
"Normally", you should have something like this :
Products :
. id
. name
Categories :
. id
. name
category_product (alphabetically ordered name)
. product_id
. category_id
And your Models:
class Category extends \Eloquent {
public function products()
{
return $this->belongsToMany('namespace\to\your\model\Product');
}
}
class Product extends \Eloquent {
public function categories()
{
return $this->belongsToMany('namespace\to\your\model\Category');
}
}
Then you can do the following :
$this->data["products"] = Category::find($id)->products;
or
$this->data["products"] = Category::find($id)->products()->get();
Laravel will take care to call the pivot table for you.
It's not common to name your class with a plural, get used to name your class with their singular
And see also : http://laravel.com/docs/5.0/eloquent#many-to-many
here is an example
Table Structure
Game
--id
--game
Posts
--id
--game_id
--post_text
class Posts extends Eloquent {
protected $primaryKey = 'id';
protected $table = 'posts';
public function games() {
return $this->hasOne('games','id');
}
}
class Games extends Eloquent {
protected $primaryKey = 'id';
protected $table = 'games';
public function posts() {
return $this->belongsTo('posts','game_id');
}
}
I need to get the game name of a certain post. How can I get it using eloquent?
here is my initial code
echo $post->games['game'];
but I get the wrong data.
The way it queries is this.
'query' => string 'select * from `games` where `games`.`id` = ? limit 1' (length=52)
'bindings' =>
array (size=1)
0 => int 5
Firstly Eloquent model names are not plural, so by default they should be Game and Post.
Secondly relationship return values must be changed. In hasOne and belongsTo you will need to use model class names like below. I also left out some optional code which is not required for the code to work.
class Post extends Eloquent {
public function game() {
return $this->hasOne('Game');
}
}
class Game extends Eloquent {
public function post() {
return $this->belongsTo('Post');
}
}
Now you can get the game name by $post->game->name
Hello I'm trying to make script that show all categories and if category belongs to post this category should be checked with checkbox. My script wont works could you help me please. It shows only one checked category when have to shows two.
Controller Category model:
class Category extends Eloquent {
protected $table= "categories";
public function posts(){
return $this->belongsToMany('Post');
}
}
Post model
class Post extends Eloquent {
protected $table = 'posts';
public function categories(){
return $this->belongsToMany('Category');
}
}
catRelation:
[{"id":"45","post_id":"132","category_id":"1","created_at":"2014-12-26 20:32:41","updated_at":"2014-12-26 20:32:41"},{"id":"46","post_id":"132","category_id":"3","created_at":"2014-12-26 20:32:41","updated_at":"2014-12-26 20:32:41"}]
all categories: [{"id":"1","name":"Laravel","slug":"laravel","created_at":"-0001-11-30 00:00:00","updated_at":"-0001-11-30 00:00:00"},{"id":"3","name":"PHP","slug":"php","created_at":"-0001-11-30 00:00:00","updated_at":"-0001-11-30 00:00:00"}]
A category shouldn't ever belong to a post, but rather a post should belong to a category.
I assume catRelation is your pivot table. It's worth nothing that you need neither id, created_at or updated_at for this.
Example models:
class Post extends Eloquent
{
protected $table = 'posts';
public function category()
{
return $this->belongsToMany('Category', 'catRelation', 'category_id');
}
}
class Category extends Eloquent
{
protected $table = 'categories';
public function post()
{
return $this->belongsToMany('Post', 'catRelation', 'post_id');
}
}
Note: I may have got the final arguments in belongsToMany the wrong way around.
I've a one-to-many relationship with models
Article
class Article extends Eloquent {
protected $table = 'articles';
public function categories()
{
return $this->belongsTo('ArticleCategory');
}
}
ArticleCategory
class ArticleCategory extends Eloquent {
protected $table = 'articles_categories';
public function articles()
{
return $this->hasMany('Article');
}
}
In my controller I'm trying to grab all articles from a category
$categories = ArticleCategory::find(1);
$article = $categories->articles;
return $article;
and that works perfectly.
But when I’m trying to make an inverse
$article = Article::find(1);
$category = $article->categories;
return $category;
I'm getting null. I should get a category return for an article id in find().
Database tabels:
- articles: Id | title | description | category_id
- articles_categories: Id | title
Since it's one to many relationship you can easily do this
$category = ArticleCategory::find($article->category_id);
I think the error is in the naming in your database fields.
The field in your articles table which is pointing to the articles_categories should be name articles_categories_id.
Try this
public function categories()
{
return $this->belongsTo('ArticleCategory','category_id');
}