Reload Grid

import com.atlassian.crowd.embedded.api.User
import com.atlassian.jira.component.ComponentAccessor
import com.atlassian.jira.issue.Issue
import com.atlassian.jira.issue.IssueManager
import com.atlassian.jira.security.JiraAuthenticationContext
import com.atlassian.plugin.PluginAccessor
import com.atlassian.jira.user.ApplicationUser
  
// get an issue
IssueManager issueManager = ComponentAccessor.getOSGiComponentInstanceOfType(IssueManager.class);
Issue issue = issueManager.getIssueObject("TEST-1");
  
// find TGE custom fields
PluginAccessor pluginAccessor = ComponentAccessor.getPluginAccessor();
Class tgeConfigManagerClass = pluginAccessor.getClassLoader().findClass("com.idalko.jira.plugins.igrid.api.config.grid.TGEGridConfigManager");
def tgeConfigManager = ComponentAccessor.getOSGiComponentInstanceOfType(tgeConfigManagerClass);
List<Long> tgeCustomFieldIds = tgeConfigManager.getGridCustomFieldIds();
  
// get current user
JiraAuthenticationContext jiraAuthenticationContext = ComponentAccessor.getOSGiComponentInstanceOfType(JiraAuthenticationContext.class);
Object userObject = jiraAuthenticationContext.getLoggedInUser();
User user = userObject instanceof ApplicationUser ? ((ApplicationUser) userObject).getDirectoryUser() : (User) userObject;
  
// reload grids
Class dataManagerClass = pluginAccessor.getClassLoader().findClass("com.idalko.jira.plugins.igrid.api.data.TGEGridTableDataManager");
def tgeGridDataManager = ComponentAccessor.getOSGiComponentInstanceOfType(dataManagerClass);
  
StringBuilder result = new StringBuilder();
try {
    tgeGridDataManager.reloadGrids(issue.getId(), new HashSet<Long>(tgeCustomFieldIds), user);
    result.append("Grids are reloaded!\n");
} catch (Exception e) {
    result.append("Grids cannot be reloaded: " + e.getMessage() + "\n");
}
  
println(result.toString());
return result.toString();