Symfony OneToMany persisting data - symfony

Question

I am using Symfony3.4 and have the following relationship in the database between House and Type entities:
house
+----------------------------------------------+
| id | title | description |
+----------------------------------------------+
| 1 | some title 1 | some description 1 |
+----------------------------------------------+
| 2 | some title 2 | some description 2 |
+----------------------------------------------+
type
+----------------+
| id | name |
+----------------+
| 1 | shortstay |
+----------------+
| 2 | rent |
+----------------+
| 4 | sell |
+----------------+
house_types
+-----------------------------------+
| id | house_id | type_id | price |
+-----------------------------------+
| 1 | 1 | 2 | 1000 |
+-----------------------------------+
| 2 | 1 | 3 | 1000000 |
+-----------------------------------+
| 3 | 2 | 1 | 100 |
+-----------------------------------+
| 4 | 2 | 3 | 200000 |
+-----------------------------------+
Here are my entities:
House entity
class House extends EntityBase
{
/**
* #ORM\OneToMany(targetEntity="AppBundle\Entity\HouseHasTypes", mappedBy="houses", cascade={"persist","remove"})
*/
protected $hasTypes;
Type entity
class Type extends EntityBase
{
/**
* #ORM\OneToMany(targetEntity="AppBundle\Entity\HouseHasTypes", mappedBy="types", cascade={"persist","remove"})
*/
protected $hasHouses;
HouseHasTypes entity
class HouseHasTypes extends EntityBase
{
/**
* #ORM\ManyToOne(targetEntity="AppBundle\Entity\House", cascade={"persist"}, fetch="EAGER")
* #ORM\JoinColumn(name="house_id", referencedColumnName="id", nullable=true)
*/
protected $houses;
/**
* #ORM\ManyToOne(targetEntity="AppBundle\Entity\Type", cascade={"persist","remove"}, fetch="EAGER" )
* #ORM\JoinColumn(name="type_id", referencedColumnName="id",nullable=true)
*/
protected $types;
/**
* #var int
*
* #ORM\Column(name="price", type="integer")
*/
protected $price;
I did not quite get the difference between ManyToOne and OneToOne relationship. Which one should mine be?
Also, what would be the easiest way to handle inserting new data into the 2 entities (House and HouseHasTypes). Right now I can render the checkboxes for each row in type table as follows:
$builder
...
->add('hasTypes', EntityType::class, array(
'required' => true,
'class' => Type::class,
'expanded' => true,
'multiple' => true,
))
And the in the controller I am planning to make a foreach(){} for each of the checked Types and setHouse() and setPrice() there. Is there any other more efficient way to do this?
How can I render as many textboxes as there are the abovementioned EntityType checkboxes to define a price for each Type selected? I am currently hardcoding three html input text elements and hiding them with javascript based on checked checkboxes. If I make a custom form, how can I tell it to render 3 text inputs (since there're 3 rows in the entity table)
Sorry for asking so many questions. Any help would be much appreciated

Answer 1

Your database model seems correct.
To define you the OneToMany, ManyToOne and OneToOne relationship, I made you little examples:
Imagine we have two entities: USER and ORDER.
OneToMany:
An user can do 0, 1 or many orders right ? It means that One user can be linked To 0, 1 or Many orders.
USER(id:1) --> ORDER(id:1)
--> ORDER(id:3)
--> ORDER(id:8)
ManyToOne:
An order can be done by one and only one user right ? It means that Many orders can be linked To One user.
ORDER(id:1) --> USER(id:1)
ORDER(id:3) --> USER(id:1)
ORDER(id:8) --> USER(id:1)
OneToOne:
Now imagine we have two others entities: USER and EMAIL.
An user can have one and only one email address and an email address can have one an only one user right ? It means that One user can be linked To One email address and One email address can be linked To One user.
USER(id:1) --> EMAIL(id:6)
USER(id:3) --> EMAIL(id:7)
USER(id:8) --> EMAIL(id:1)
Hope I was clear.
For your others questions, Symfony will automatically insert data on form submit if you have correctly defined your getter and setter in entities no needs to do a foreach