1) Modified some labels and controls.

2) Fixed issue where the same user is showing in SQL query.

3) Added SQL tab in the dialog.

refs #3893

docs/en_US/role_reassign_dialog.rst

@@ -5,33 +5,45 @@
 `Role Reassign/Drop Own Dialog`:index:
 **************************************
 
-Use the *Role Reassign/Drop Own* dialog to change the ownership of database objects owned
+Use the *Reassign/Drop Own* dialog to change the ownership of database objects owned
 by a database role. This dialog instructs the system to change the ownership of database
 objects owned by any of the *old_roles* to *new_role*.
 
-The *Role Reassign/Drop Own* dialog organizes the Reassign & Drop role through General tab.
+The *Reassign/Drop Own* dialog organizes the Reassign & Drop role through General tab.
 
 .. image:: images/role_reassign_dialog.png
-    :alt: Role Reassign/Drop Own dialog
+    :alt: Reassign/Drop Own dialog
     :align: center
 
-* Use the *Role operation* field to provide Reassign option.
+* Use the *Operation* field to provide Reassign option.
 * Provide a new role in the *Reassign Objects to* field; The ownership of all the objects within the selected database,
   and of all shared objects (databases, tablespaces), owned by the *old_role* will be reassigned to *new_role*.
 * Provide a database on which the reassignment is to be carried out.
 
 The above example demonstrates reassigning *old_role* to *new_role*.
 
+Click the *SQL* tab to continue.
+
+.. image:: images/role_reassign_dialog_sql.png
+    :alt: Reassign/Drop Own dialog sql
+    :align: center
+
 Removing database objects owned by a database role.
 
 .. image:: images/role_drop_dialog.png
-    :alt: Role Reassign/Drop Own dialog
+    :alt: Reassign/Drop Own dialog
     :align: center
 
-* Use the *Role operation* field to provide Drop option.
+* Use the *Operation* field to provide Drop option.
-* Use the *Drop with* field to provide CASCADE option, RESTRICT is default.
+* Use the *Cascade?* field to provide Yes, No is default.
 * Provide a database on which the drop of objects is to be carried out.
 
+Click the *SQL* tab to continue.
+
+.. image:: images/role_drop_dialog_sql.png
+    :alt: Reassign/Drop Own dialog sql
+    :align: center
+
 The above examples demonstrates drop owned by *role*.
 
 * Click the *Help* button (?) to access online help.

web/pgadmin/browser/server_groups/servers/roles/__init__.py

@@ -1301,6 +1301,61 @@ WHERE
 
         return status, res
 
+    @check_precondition()
+    def get_reassign_own_sql(self, gid, sid, rid):
+
+        """
+        This function is used to generate sql for reassign/drop role.
+
+        Args:
+            sid: Server ID
+            rid: Role Id.
+
+        Returns: Json object with sql generate
+        """
+
+        try:
+
+            data = dict()
+
+            if request.data:
+                data = json.loads(request.data, encoding='utf-8')
+            else:
+                rargs = request.args or request.form
+                for k, v in rargs.items():
+                    try:
+                        data[k] = json.loads(v, encoding='utf-8')
+                    except ValueError as ve:
+                        data[k] = v
+
+            required_args = ['role_op', 'did', 'old_role_name',
+                             'new_role_name'] \
+                if 'role_op' in data and data['role_op'] == 'reassign' \
+                else ['role_op', 'did', 'drop_with_cascade']
+
+            for arg in required_args:
+                if arg not in data:
+                    return make_json_response(
+                        data=gettext("-- definition incomplete"),
+                        status=200
+                    )
+
+            is_reassign = True if data['role_op'] == 'reassign' else False
+            data['is_reassign'] = is_reassign
+
+            sql = render_template(
+                "/".join([self.sql_path, _REASSIGN_OWN_SQL]),
+                data=data
+            )
+
+            return make_json_response(
+                data=sql.strip('\n'),
+                status=200
+            )
+
+        except Exception as e:
+            return False, internal_server_error(errormsg=str(e))
+
     @check_precondition()
     def role_reassign_own(self, gid, sid, rid):
 
@@ -1387,8 +1442,9 @@ WHERE
 
             return make_json_response(
                 success=1,
-                info=gettext("Reassign owned successfully!") if is_reassign
+                info=gettext("Reassign owned executed successfully!")
-                else gettext("Drop owned successfully!")
+                if is_reassign
+                else gettext("Drop owned executed successfully!")
             )
 
         except Exception as e:

web/pgadmin/browser/server_groups/servers/roles/static/js/role.js

@@ -392,7 +392,7 @@ define('pgadmin.node.role', [
         var tree = pgBrowser.tree,
           _i = tree.selected(),
           _d = _i && _i.length == 1 ? tree.itemData(_i) : undefined,
-          obj = this, finalUrl;
+          obj = this, finalUrl, old_role_name;
 
         //RoleReassign Model (Objects like role, database)
         var RoleReassignObjectModel = Backbone.Model.extend({
@@ -402,6 +402,7 @@ define('pgadmin.node.role', [
             did: undefined,
             new_role_id: undefined,
             new_role_name: undefined,
+            old_role_name: undefined,
             drop_with_cascade: false
           },
 
@@ -413,7 +414,7 @@ define('pgadmin.node.role', [
           schema: [
             {
               id: 'role_op',
-              label: gettext('Role operation'),
+              label: gettext('Operation'),
               cell: 'string',
               type: 'radioModern',
               controlsClassName: 'pgadmin-controls col-12 col-sm-8',
@@ -538,7 +539,7 @@ define('pgadmin.node.role', [
             },
             {
               id: 'drop_with_cascade',
-              label: gettext('Drop with'),
+              label: gettext('Cascade?'),
               cell: 'string',
               type: 'switch',
               controlsClassName: 'pgadmin-controls col-12 col-sm-8',
@@ -546,8 +547,8 @@ define('pgadmin.node.role', [
               disabled: 'isDisabled',
               group: gettext('General'),
               options: {
-                'onText':  gettext('CASCADE'),
+                'onText':  gettext('Yes'),
-                'offText':  gettext('RESTRICT'), 'size': 'mini', width: '90'
+                'offText':  gettext('No'), 'size': 'mini'
               },
               deps: ['role_op'],
               helpMessage: gettext('Note: CASCADE will automatically drop objects that depend on the affected objects, and in turn all objects that depend on those objects'),
@@ -577,6 +578,38 @@ define('pgadmin.node.role', [
               },
               first_empty: false,
               helpMessage: gettext('Target database on which the operation will be carried out'),
+            },
+            {
+              id: 'sqltab', label: gettext('SQL'), group: gettext('SQL'),
+              type: 'text', disabled: false, control: Backform.SqlTabControl.extend({
+                initialize: function() {
+                  // Initialize parent class
+                  Backform.SqlTabControl.prototype.initialize.apply(this, arguments);
+                },
+                onTabChange: function(sql_tab_obj) {
+                  // Fetch the information only if the SQL tab is visible at the moment.
+                  if (this.dialog && sql_tab_obj.shown == this.tabIndex) {
+                    var self = this,
+                      roleReassignData = self.model.toJSON(),
+                      getUrl;
+                    // Add existing role
+                    roleReassignData.old_role_name = old_role_name;
+
+                    getUrl = obj.generate_url(_i, 'reassign' , _d, true);
+
+                    $.ajax({
+                      url: getUrl,
+                      type: 'GET',
+                      cache: false,
+                      data: roleReassignData,
+                      dataType: 'json',
+                      contentType: 'application/json',
+                    }).done(function(res) {
+                      self.sqlCtrl.setValue(res.data);
+                    });
+                  }
+                },
+              }),
             }
           ],
           validate: function() {
@@ -668,6 +701,7 @@ define('pgadmin.node.role', [
                   node = _d && pgBrowser.Nodes[_d._type];
 
                 finalUrl = obj.generate_url(_i, 'reassign' , _d, true);
+                old_role_name = _d.label;
 
                 if (!_d)
                   return;

web/pgadmin/browser/server_groups/servers/roles/tests/role_test_data.json

@@ -123,5 +123,127 @@
         "test_result_data": {}
       }
     }
+  ],
+    "role_reassign_sql": [
+    {
+      "name": "Reassign own role - sql",
+      "is_positive_test": true,
+      "test_data": {
+        "did": null,
+        "new_role_id": null,
+        "old_role_name": "role_user_1",
+        "new_role_name": "role_user_2",
+        "role_op": "reassign"
+      },
+      "mocking_required": false,
+      "mock_data": {},
+      "expected_data": {
+        "status_code": 200,
+        "error_msg": null,
+        "test_result_data": {
+          "result": "REASSIGN OWNED BY role_user_1 TO role_user_2"
+        }
+      }
+    },
+    {
+      "name": "Reassign own role - sql (SESSION_USER)",
+      "is_positive_test": true,
+      "test_data": {
+        "did": null,
+        "new_role_id": null,
+        "role_op": "reassign",
+        "old_role_name": "role_user_1",
+        "new_role_name": "SESSION_USER"
+      },
+      "mocking_required": false,
+      "mock_data": {},
+      "expected_data": {
+        "status_code": 200,
+        "error_msg": null,
+        "test_result_data": {
+          "result": "REASSIGN OWNED BY role_user_1 TO SESSION_USER"
+        }
+      }
+    },
+    {
+      "name": "Reassign own role - sql (CURRENT_USER)",
+      "is_positive_test": true,
+      "test_data": {
+        "did": null,
+        "new_role_id": null,
+        "role_op": "reassign",
+        "old_role_name": "role_user_1",
+        "new_role_name": "CURRENT_USER"
+      },
+      "mocking_required": false,
+      "mock_data": {},
+      "expected_data": {
+        "status_code": 200,
+        "error_msg": null,
+        "test_result_data": {
+          "result": "REASSIGN OWNED BY role_user_1 TO CURRENT_USER"
+        }
+      }
+    },
+    {
+      "name": "Reassign own role - sql (CURRENT_ROLE)",
+      "is_positive_test": true,
+      "test_data": {
+        "did": null,
+        "new_role_id": null,
+        "role_op": "reassign",
+        "old_role_name": "role_user_1",
+        "new_role_name": "CURRENT_ROLE"
+      },
+      "server_min_version": 140000,
+      "skip_msg": "CURRENT_ROLE are not supported by PPAS/PG 13.0 and below.",
+      "mocking_required": false,
+      "mock_data": {},
+      "expected_data": {
+        "status_code": 200,
+        "error_msg": null,
+        "test_result_data": {}
+      }
+    },
+    {
+      "name": "Drop own role - sql (default)",
+      "is_positive_test": true,
+      "test_data": {
+        "did": null,
+        "new_role_id": null,
+        "old_role_name": "role_user_1",
+        "role_op": "drop",
+        "drop_with_cascade": false
+      },
+      "mocking_required": false,
+      "mock_data": {},
+      "expected_data": {
+        "status_code": 200,
+        "error_msg": null,
+        "test_result_data": {
+          "result": "DROP OWNED BY role_user_1"
+        }
+      }
+    },
+    {
+      "name": "Drop own role - sql (cascade)",
+      "is_positive_test": true,
+      "test_data": {
+        "did": null,
+        "new_role_id": null,
+        "old_role_name": "role_user_1",
+        "role_op": "drop",
+        "drop_with_cascade": true
+      },
+      "mocking_required": false,
+      "mock_data": {},
+      "expected_data": {
+        "status_code": 200,
+        "error_msg": null,
+        "test_result_data": {
+          "result": "DROP OWNED BY role_user_1 CASCADE"
+        }
+      }
+    }
   ]
 }

web/pgadmin/browser/server_groups/servers/roles/tests/test_role_reassign_own_sql.py

@@ -0,0 +1,71 @@
+##########################################################################
+#
+# pgAdmin 4 - PostgreSQL Tools
+#
+# Copyright (C) 2013 - 2021, The pgAdmin Development Team
+# This software is released under the PostgreSQL Licence
+#
+##########################################################################
+
+from pgadmin.utils.route import BaseTestGenerator
+from regression import parent_node_dict
+from regression.python_test_utils import test_utils as utils
+from . import utils as roles_utils
+import json
+from unittest.mock import patch
+
+
+class ReassignRoleSQLTestCase(BaseTestGenerator):
+    """This class tests the role reassign/drop scenario"""
+
+    url = '/browser/role/reassign/'
+
+    # Generates scenarios
+    scenarios = utils.generate_scenarios("role_reassign_sql",
+                                         roles_utils.test_cases)
+
+    def setUp(self):
+        self.server_id = parent_node_dict["server"][-1]["server_id"]
+        self.data = self.test_data
+        self.role_id = 1
+        self.data['did'] = parent_node_dict['database'][-1]['db_id']
+
+        if hasattr(self, 'server_min_version') and \
+            self.server_information['server_version'] \
+                < self.server_min_version:
+            self.skipTest(self.skip_msg)
+
+    def reassign_get_api(self):
+
+        get_response = self.tester.get(
+            self.url + str(utils.SERVER_GROUP) + '/' +
+            str(self.server_id) + '/' + str(self.role_id),
+            data=json.dumps(self.data),
+            follow_redirects=True)
+        return get_response
+
+    def runTest(self):
+
+        """This function tests role reassign/drop scenario"""
+        if self.is_positive_test:
+            get_response = self.reassign_get_api()
+        elif self.mocking_required:
+            with patch(self.mock_data["function_name"],
+                       return_value=eval(self.mock_data["return_value"])):
+                get_response = self.reassign_get_api()
+
+        self.assertEqual(get_response.status_code,
+                         self.expected_data['status_code'])
+
+        self.assertEqual(get_response.json['data'],
+                         self.expected_data['test_result_data']['result'])
+
+    def tearDown(self):
+        """This function delete the role from added server"""
+        connection = utils.get_db_connection(self.server['db'],
+                                             self.server['username'],
+                                             self.server['db_password'],
+                                             self.server['host'],
+                                             self.server['port'],
+                                             self.server['sslmode'])
+        connection.close()