refactor(model): use QueryInterface getter (#9126)

lib/model.js

@@ -2995,9 +2995,9 @@ class Model {
 
     let promise;
     if (!options.increment) {
-      promise = this.sequelize.getQueryInterface().decrement(this, this.getTableName(options), values, where, options);
+      promise = this.QueryInterface.decrement(this, this.getTableName(options), values, where, options);
     } else {
-      promise = this.sequelize.getQueryInterface().increment(this, this.getTableName(options), values, where, options);
+      promise = this.QueryInterface.increment(this, this.getTableName(options), values, where, options);
     }
 
     return promise.then(affectedRows => {
@@ -3649,7 +3649,7 @@ class Model {
         args = [this, this.constructor.getTableName(options), values, where, options];
       }
 
-      return this.sequelize.getQueryInterface()[query].apply(this.sequelize.getQueryInterface(), args)
+      return this.constructor.QueryInterface[query].apply(this.constructor.QueryInterface, args)
         .then(results => {
           const result = _.head(results);
           const rowsUpdated = results[1];
@@ -3860,7 +3860,7 @@ class Model {
 
         this.setDataValue(field, values[field]);
 
-        return this.sequelize.getQueryInterface().update(
+        return this.constructor.QueryInterface.update(
           this, this.constructor.getTableName(options), values, where, _.defaults({ hooks: false, model: this.constructor }, options)
         ).then(results => {
           const rowsUpdated = results[1];
@@ -3874,7 +3874,7 @@ class Model {
           return _.head(results);
         });
       } else {
-        return this.sequelize.getQueryInterface().delete(this, this.constructor.getTableName(options), where, _.assign({ type: QueryTypes.DELETE, limit: null }, options));
+        return this.constructor.QueryInterface.delete(this, this.constructor.getTableName(options), where, _.assign({ type: QueryTypes.DELETE, limit: null }, options));
       }
     }).tap(() => {
       // Run after hook