Respect custom field names in json queries

Instead of using the first part of the key directly, respect
defined custom field names

changelog.md

 # Next
 # Next
+- [FIXED] Custom field names in json queries
 - [FIXED] JSON cast key using the equality operator. [#3824](https://github.com/sequelize/sequelize/issues/3824)
 - [FIXED] JSON cast key using the equality operator. [#3824](https://github.com/sequelize/sequelize/issues/3824)
 - [FIXED] Map column names with `.field` in scopes with includes. [#4210](https://github.com/sequelize/sequelize/issues/4210)
 - [FIXED] Map column names with `.field` in scopes with includes. [#4210](https://github.com/sequelize/sequelize/issues/4210)
 - [FIXED] `addScope` when the model does not have any initial scopes [#4243](https://github.com/sequelize/sequelize/issues/4243)
 - [FIXED] `addScope` when the model does not have any initial scopes [#4243](https://github.com/sequelize/sequelize/issues/4243)

lib/dialects/abstract/query-generator.js

@@ -1820,7 +1820,7 @@ var QueryGenerator = {
         value = {};
         value = {};
 
 
         Dottie.set(value, key.split('.').slice(1), tmp);
         Dottie.set(value, key.split('.').slice(1), tmp);
-        key = key.split('.')[0];
+        key = field.field || key.split('.')[0];
       }
       }
     }
     }
 
 

test/unit/sql/where.test.js

@@ -657,6 +657,20 @@ suite(Support.getTestDialectTeaser('SQL'), function() {
         }, {
         }, {
           default: '[data] @> \'{"company":"Magnafone"}\''
           default: '[data] @> \'{"company":"Magnafone"}\''
         });
         });
+
+        testsql('metaData.nested.attribute', 'value', {
+          model: {
+            rawAttributes: {
+              metaData: {
+                field: 'meta_data',
+                fieldName: 'metaData',
+                type: new DataTypes.JSONB()
+              }
+            }
+          }
+        }, {
+          default: "([meta_data]#>>'{nested, attribute}') = 'value'"
+        });
       });
       });
     }
     }