改进多对多关联

library/think/db/Query.php

@@ -2130,14 +2130,23 @@ class Query
                 $this->field('*');
             }
             foreach ($relations as $key => $relation) {
-                $closure = false;
+                $closure = $name = null;
                 if ($relation instanceof \Closure) {
                     $closure  = $relation;
                     $relation = $key;
+                } elseif (!is_int($key)) {
+                    $name     = $relation;
+                    $relation = $key;
                 }
                 $relation = Loader::parseName($relation, 1, false);
-                $count    = '(' . $this->model->$relation()->getRelationCountQuery($closure) . ')';
+
-                $this->field([$count => Loader::parseName($relation) . '_count']);
+                $count = '(' . $this->model->$relation()->getRelationCountQuery($closure, $name) . ')';
+
+                if (empty($name)) {
+                    $name = Loader::parseName($relation) . '_count';
+                }
+
+                $this->field([$count => $name]);
             }
         }
         return $this;

library/think/model/relation/BelongsToMany.php

@@ -360,10 +360,16 @@ class BelongsToMany extends Relation
      * 获取关联统计子查询
      * @access public
      * @param \Closure $closure 闭包
+     * @param string   $name    统计数据别名
      * @return string
      */
-    public function getRelationCountQuery($closure)
+    public function getRelationCountQuery($closure, &$name = null)
     {
+        $return = call_user_func_array($closure, [ & $this->query]);
+        if ($return && is_string($return)) {
+            $name = $return;
+        }
+
         return $this->belongsToManyQuery($this->foreignKey, $this->localKey, [
             'pivot.' . $this->localKey => [
                 'exp',
@@ -513,6 +519,30 @@ class BelongsToMany extends Relation
         }
     }
 
+    /**
+     * 判断是否存在关联数据
+     * @access public
+     * @param mixed $data  数据 可以使用关联模型对象 或者 关联对象的主键
+     * @return Pivot
+     * @throws Exception
+     */
+    public function attached($data)
+    {
+        if ($data instanceof Model) {
+            // 根据关联表主键直接写入中间表
+            $relationFk = $data->getPk();
+            $id         = $data->$relationFk;
+        } else {
+            $id = $data;
+        }
+
+        $pk = $this->parent->getPk();
+
+        $pivot = $this->pivot->where($this->localKey, $this->parent->$pk)->where($this->foreignKey, $id)->find();
+
+        return $pivot ?: false;
+    }
+
     /**
      * 解除关联的一个中间表数据
      * @access public

library/think/model/relation/HasMany.php

@@ -152,12 +152,16 @@ class HasMany extends Relation
      * 创建关联统计子查询
      * @access public
      * @param \Closure $closure 闭包
+     * @param string   $name    统计数据别名
      * @return string
      */
-    public function getRelationCountQuery($closure)
+    public function getRelationCountQuery($closure, &$name = null)
     {
         if ($closure) {
-            call_user_func_array($closure, [ & $this->query]);
+            $return = call_user_func_array($closure, [ & $this->query]);
+            if ($return && is_string($return)) {
+                $name = $return;
+            }
         }
         $localKey = $this->localKey ?: $this->parent->getPk();
         return $this->query->whereExp($this->foreignKey, '=' . $this->parent->getTable() . '.' . $localKey)->fetchSql()->count();

library/think/model/relation/HasManyThrough.php

@@ -120,6 +120,18 @@ class HasManyThrough extends Relation
     public function relationCount($result, $closure)
     {}
 
+    /**
+     * 创建关联统计子查询
+     * @access public
+     * @param \Closure $closure 闭包
+     * @param string   $name    统计数据别名
+     * @return string
+     */
+    public function getRelationCountQuery($closure, &$name = null)
+    {
+        throw new Exception('relation not support: withCount');
+    }
+
     /**
      * 执行基础查询（进执行一次）
      * @access protected

library/think/model/relation/MorphMany.php

@@ -188,15 +188,19 @@ class MorphMany extends Relation
     }
 
     /**
-     * 获取关联统计子查询
+     * 创建关联统计子查询
      * @access public
      * @param \Closure $closure 闭包
+     * @param string   $name    统计数据别名
      * @return string
      */
-    public function getRelationCountQuery($closure)
+    public function getRelationCountQuery($closure, &$name = null)
     {
         if ($closure) {
-            call_user_func_array($closure, [ & $this->query]);
+            $return = call_user_func_array($closure, [ & $this->query]);
+            if ($return && is_string($return)) {
+                $name = $return;
+            }
         }
 
         return $this->query->where([

library/think/model/relation/MorphOne.php

@@ -227,4 +227,15 @@ class MorphOne extends Relation
         }
     }
 
+    /**
+     * 创建关联统计子查询
+     * @access public
+     * @param \Closure $closure 闭包
+     * @param string   $name    统计数据别名
+     * @return string
+     */
+    public function getRelationCountQuery($closure, &$name = null)
+    {
+        throw new Exception('relation not support: withCount');
+    }
 }

library/think/model/relation/MorphTo.php

@@ -285,4 +285,15 @@ class MorphTo extends Relation
         return $this->parent->setRelation($this->relation, null);
     }
 
+    /**
+     * 创建关联统计子查询
+     * @access public
+     * @param \Closure $closure 闭包
+     * @param string   $name    统计数据别名
+     * @return string
+     */
+    public function getRelationCountQuery($closure, &$name = null)
+    {
+        throw new Exception('relation not support: withCount');
+    }
 }

library/think/model/relation/OneToOne.php

@@ -323,4 +323,15 @@ abstract class OneToOne extends Relation
         return $data;
     }
 
+    /**
+     * 创建关联统计子查询
+     * @access public
+     * @param \Closure $closure 闭包
+     * @param string   $name    统计数据别名
+     * @return string
+     */
+    public function getRelationCountQuery($closure, &$name = null)
+    {
+        throw new Exception('relation not support: withCount');
+    }
 }