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This article mainly introduces the example analysis of one-to-many relationship in laravel orm, which is very detailed and has certain reference value. Friends who are interested must finish it!

For the understanding of the one-to-many relationship in laravel orm

Article table article, the article can be commented naturally, table comment records the comments of the article, the relationship between the article and comments is one-to-many, an article can have more than one comment. In the comment table, there is a field article to record the article to which the comment belongs. The relationship between the article and the comment is as follows:

Article:id......

Comment: id...... Article_id

There is a foreign key article_id associated with article in the comment table, so it is the belongsTo method in the Comment model and the hasMany method in the Article model

In the model Article of the article, you can associate comments in the following ways

Public function comments () {

Return $this- > hasManay ('Comment (here is the model to be associated, this example is the comment model Comment),' article_id' (here is the field name of the associated foreign key, and this example is the article_id field), 'id' (corresponding to the primary key of the associated model, where id is the id of the associated article table))

}

Correspondingly, in the Comment model, you can associate articles in the following ways

Public function article () {

Return $this- > belongsTo ('Article (here is the model to be associated, this example is the article model Article),' article_id' (here is the field name of the associated foreign key, and this example is the article_id field), 'id' (corresponding to the primary key of the associated model, where id is the id of the associated article table))

}

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