我有两个型号:
User.json
"relations": {
"items": {
"type": "hasMany",
"model": "Item",
"foreignKey": "userid"
},}
Item.json
"relations": {
"user": {
"type": "belongsTo",
"model": "User",
"foreignKey": "userid"
},}
Loopback生成此端点:
DELETE / User / {userid} / items / {itemid}
我想覆盖默认删除方法,因此不会删除项目只有属性active将设置为false。
我的问题是:如何覆盖默认方法或阻止删除记录?
我试过了:
Item.once('attached',function(){
Item.destroyById = function(filter,auth, cb){
console.log('This is a overridden method')
}
})
这似乎没有被执行。
和:
Item.observe('before delete', function(ctx, next) {
var err = new Error("Not deleted");
next(err)
});
它工作(项目没有删除)但抛出错误,我想避免。也许有办法将一些参数传递给next()方法?
也许您可以为该操作实现连接器挂钩,您可以在其中动态修改数据库查询。
var connector = Model.getDataSource().connector;
connector.observe('before execute', function(ctx, next) {
// preview your query and modify it as desired
console.log(ctx);
// so when you call next it will be executed in a shape you've created
next();
});
这里有一些关于它的更多信息:https://loopback.io/doc/en/lb3/Connector-hooks.html