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Consider two models A and B
A -> relatedTo B is a one to one relationship
What is the difference in using (A ->hasOne-- B) and (A ->belongsTo-- B)?
Can I use them interchangeably?
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The only difference between hasOne and belongsTo is where the foreign key column is located. Let's say you have two entities: User and an Account. In short hasOne and belongsTo are inverses of one another - if one record belongTo the other, the other hasOne of the first.
belongsTo(B) association means that a One-To-One relationship exists between A and B , with the foreign key being defined in the source model ( A ). The A. hasMany(B) association means that a One-To-Many relationship exists between A and B , with the foreign key being defined in the target model ( B ).
hasOne relationship in laravel is used to create the relation between two tables. hasOne means create the relation one to one. For example if a article has comments and we wanted to get one comment with the article details then we can use hasOne relationship or a user can have a profile table.
Laravel eager loading. What is eager loading? Eager loading is a concept in which when retrieving items, you get all the needed items together with all (or most) related items at the same time. This is in contrast to lazy loading where you only get one item at one go and then retrieve related items only when needed.
No, the difference depends on where your foreign key is.
In your example, if A has a b_id column, then A belongsTo B.
If B has an a_id column, then A hasOne or hasMany B depending on how many B should have.
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Main difference is as below:
belongsTo and belongsToMany - you're telling Laravel that this table holds the foreign key that connects it to the other table.
hasOne and hasMany - you're telling Laravel that this table does not have the foreign key.
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