Question

我有一个地址表和一个居民表以一对多方式加入，以便查询

[{
    "id": 806,
    "code": "AYC8rk",
    "postcode": "GL141PQ",
    "address": "THE COTTAGE, ADSETT COURT, LONDON ",
    "resident": [{
        "id": 5441,
        "firstname": "THOMAS",
        "surname": "MARSHALL"
    }, {
        "id": 5442,
        "firstname": "ANNA",
        "surname": "RAYMOND"
    }, {
        "id": 6188,
        "firstname": "WILL",
        "surname": "MARSHALL"
    }]
}]

会返回类似这样的内容

House::with('resident')
->where('postcode', 'GL141PQ', 'and')
->where('surname', 'MARSHALL')
->get();

如果该邮政编码中有很多属性，我需要扩展查询以在Residents表中包含姓氏，我很难过。下面显然不起作用所以我假设我需要以某种方式迭代连接表。

...list of modules...

seed = 342
np.random.seed(seed)

train_data = pd.read_csv("./train.csv")
test_data = pd.read_csv("./test.csv")

test_id = test_data.ID

train_data = train_data.drop(["ID"],axis=1)
test_data = test_data.drop(["ID"],axis=1)

array = train_data.values

# Split-out validation dataset
X = array[:,1:368].astype(float)
Y = array[:,369].astype(int)

validation_size = 0.20
seed = 7

X_train, X_validation, Y_train, Y_validation = train_test_split(X, Y, test_size=validation_size, random_state=seed)

watchlist  = [(X_train, Y_train), (X_validation, Y_validation)]

ratio = float(np.sum(Y_train == 1)) / np.sum(Y_train==0)

model = xgb.XGBClassifier(
            base_score=0.5, 
            colsample_bylevel=1, 
            colsample_bytree=1,
            gamma=0, 
            learning_rate=0.5, 
            max_delta_step=0, 
            max_depth=3,
            min_child_weight=1, 
            missing=9999999999,
            n_estimators=25, 
            nthread=-1,
            objective='binary:logistic', 
            reg_alpha=0,
            reg_lambda=1,
            scale_pos_weight=1, 
            seed=7, 
            silent=True, 
            subsample=1
)


model.fit(X_train, Y_train, eval_metric="auc", eval_set=watchlist)


## # Submission
probs = model.predict_proba(test_data)
...

非常感谢任何帮助！

Answer 1

使用像这样的Laravel with()只是懒得将居民加载到你的House模型上，它没有加入它。

你可能会做这样的事情（未经测试）：

House::with(['resident' => function($query) use ($surname) {
       $query->where('surname', $surname);
   }])
   ->where('postcode', 'GL141PQ')
   ->get();

编辑：

然后你必须自己添加联接。如上所述with（）是延迟加载，而不是加入。

House::with('resident') // lazy load all residents after query is done, you don't want to filter here
    ->leftJoin('resident', 'house.id', '=', 'resident.house_id')
    ->where('resident.surname', $surname)
    ->where('house.postcode', 'GL141PQ')
    ->groupBy('house.id')
    ->get();

或

House::with('resident') // lazy load all residents after query is done, you don't want to filter here
    ->leftJoin('resident', function($join) use ($surname) {
        $join->on('house.id', '=', 'resident.house_id')
            ->where('resident.surname', $surname)
    })
    ->where('house.postcode', 'GL141PQ')
    ->groupBy('house.id')
    ->get();

这些将为您提供所需的结果。

请注意，Laravel的->count()和->groupBy(x)彼此不太喜欢。

在一对多的关系中对'many'表进行了多次查询

1 个答案: