[5.7] Add relationship getters

src/Illuminate/Database/Eloquent/Relations/BelongsToMany.php

@@ -1021,6 +1021,16 @@ public function getQualifiedRelatedPivotKeyName()
         return $this->table.'.'.$this->relatedPivotKey;
     }
 
+    /**
+     * Get the parent key for the relationship.
+     *
+     * @return string
+     */
+    public function getParentKeyName()
+    {
+        return $this->parentKey;
+    }
+
     /**
      * Get the fully qualified parent key name for the relation.
      *
@@ -1031,6 +1041,16 @@ public function getQualifiedParentKeyName()
         return $this->parent->qualifyColumn($this->parentKey);
     }
 
+    /**
+     * Get the related key for the relationship.
+     *
+     * @return string
+     */
+    public function getRelatedKeyName()
+    {
+        return $this->relatedKey;
+    }
+
     /**
      * Get the intermediate table for the relationship.
      *

src/Illuminate/Database/Eloquent/Relations/HasManyThrough.php

@@ -536,6 +536,16 @@ public function getQualifiedFarKeyName()
         return $this->getQualifiedForeignKeyName();
     }
 
+    /**
+     * Get the foreign key on the "through" model.
+     *
+     * @return string
+     */
+    public function getFirstKeyName()
+    {
+        return $this->firstKey;
+    }
+
     /**
      * Get the qualified foreign key on the "through" model.
      *
@@ -546,6 +556,16 @@ public function getQualifiedFirstKeyName()
         return $this->throughParent->qualifyColumn($this->firstKey);
     }
 
+    /**
+     * Get the foreign key on the related model.
+     *
+     * @return string
+     */
+    public function getForeignKeyName()
+    {
+        return $this->secondKey;
+    }
+
     /**
      * Get the qualified foreign key on the related model.
      *
@@ -556,6 +576,16 @@ public function getQualifiedForeignKeyName()
         return $this->related->qualifyColumn($this->secondKey);
     }
 
+    /**
+     * Get the local key on the far parent model.
+     *
+     * @return string
+     */
+    public function getLocalKeyName()
+    {
+        return $this->localKey;
+    }
+
     /**
      * Get the qualified local key on the far parent model.
      *
@@ -565,4 +595,14 @@ public function getQualifiedLocalKeyName()
     {
         return $this->farParent->qualifyColumn($this->localKey);
     }
+
+    /**
+     * Get the local key on the intermediary model.
+     *
+     * @return string
+     */
+    public function getSecondLocalKeyName()
+    {
+        return $this->secondLocalKey;
+    }
 }

src/Illuminate/Database/Eloquent/Relations/HasOneOrMany.php

@@ -422,4 +422,14 @@ public function getQualifiedForeignKeyName()
     {
         return $this->foreignKey;
     }
+
+    /**
+     * Get the local key for the relationship.
+     *
+     * @return string
+     */
+    public function getLocalKeyName()
+    {
+        return $this->localKey;
+    }
 }

src/Illuminate/Database/Eloquent/Relations/MorphToMany.php

@@ -181,4 +181,14 @@ public function getMorphClass()
     {
         return $this->morphClass;
     }
+
+    /**
+     * Get the indicator for a reverse relationship.
+     *
+     * @return bool
+     */
+    public function getInverse()
+    {
+        return $this->inverse;
+    }
 }