Laravel Eloquent Relationships速记表

Eloquent Relationships速记表

模型关联中有个大坑：belongsTo反向关联的时候，外键是按照方法名加_id自动寻找的。除此之外的关联，是根据模型名加_id作为外键。

type	define	inverse	remark
One to One	hasOne	belongsTo	withDefault() Define default foreign key →based on the model name Inverse default foreign key → name of the relationship method and suffixing the method name with _id
One to Many	hasMany	belongsTo	Define default foreign key →based on the model name Inverse default foreign key → name of the relationship method and suffixing the method name with _id
Many to Many	belongsToMany	belongsToMany	Requires intermediate table. withPivot('column1', 'column2'); withTimestamps(); as('subscription')→withTimestamps(); wherePivot('approved', 1) wherePivotIn('priority', [1, 2]); using('App\UserRole');
Has Many Through	hasManyThrough		hasManyThrough('App\Post', 'App\User');
Polymorphic	morphMany	morphTo	morphMany('App\Comment', 'commentable') $comment = App\Comment::find(1); $commentable = $comment→commentable; ↑ Will return either a Post or Video instance, depending on which type of model owns the comment MorphMap
Many to Many Polymorphic	morphToMany	morphedByMany	morphToMany('App\Tag', 'taggable'); morphedByMany('App\Post', 'taggable');