The use of append() method in ThinkPHP5

ThinkPHP is a development framework based on PHP language. It provides a simple, elegant programming experience and powerful scalability, making it one of the preferred frameworks for PHP developers. In ThinkPHP, there is a very commonly used method - append(). This article will introduce the use of the append() method in ThinkPHP5.

1. What is the append() method

In ThinkPHP5, the append() method can append a piece of data to the Model object. The append method can add associated data to the current model object without querying its data. The append method syntax is as follows:

public function appendRelation($relation, $data = [], $replace = false)

The above syntax is explained as follows:

Parameters	Description
$relation	This parameter specifies the name of the association
$data	This parameter specifies the data to be added
$replace	This parameter specifies whether to overwrite existing associated data

2. How to use append() Method

In practical applications, we often need to add new records to existing relationships. At this time, we can use the append() method. Below, we briefly introduce how to use it.

First, we need to define the association to be added in the model, such as the city association in the following User model:

class UserModel extends Model
{
    public function city()
    {
        return $this->belongsTo('CityModel');
    }
}

Next, we need to instantiate a User object:

$user = UserModel::get(1);

Then call the append() method to add the record of the city association:

$user->appendRelation('city', [
    'id' => 100,
    'city_name' => '广州'
]);

At this point, we have successfully added a new record to the city association of the User model. If we then want to add a record, we only need to call the append() method again:

$user->appendRelation('city', [
    'id' => 101,
    'city_name' => '深圳'
]);

3. Precautions for the append() method

When using the append() method, The following points need to be noted: The

1. append() method only appends a piece of data to the relationship. If you want to add data to multiple records in the relationship, you need to call the append() method multiple times.
2. The append() method will not trigger any events, nor will it trigger verification of associated data.
3. The append() method will not overwrite existing related data by default. If you want to overwrite existing related data, you need to set the $replace parameter to true.

4. Summary

This article introduces the use of the append() method in ThinkPHP5. Through the append() method, we can add associated data to the current model object without querying its data. In actual development, if we want to add new records to existing relationships, the append() method is indispensable. I hope this article can help everyone!

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