Read Grid data for All Issues

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.getIssueManager();
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.getJiraAuthenticationContext();
Object userObject = jiraAuthenticationContext.getLoggedInUser();
User user = userObject instanceof ApplicationUser ? ((ApplicationUser) userObject).getDirectoryUser() : (User) userObject
   
// read the grid data
Class dataManagerClass = pluginAccessor.getClassLoader().findClass("com.idalko.jira.plugins.igrid.api.data.TGEGridTableDataManager");
def tgeGridDataManager = ComponentAccessor.getOSGiComponentInstanceOfType(dataManagerClass);
   
StringBuilder result = new StringBuilder();
for (Long tgeCustomFieldId : tgeCustomFieldIds) {
    try {
        def callResult = tgeGridDataManager.readAllGridDataForAllIssues(tgeCustomFieldId, null, null, 0, 10, user);
        result.append("Grid ID=" + tgeCustomFieldId + " content: " + callResult.getValues() + "\n");
    } catch (Exception e) {
        result.append("Grid ID=" + tgeCustomFieldId + " data cannot be retrieved: " + e.getMessage() + "\n");
    }
}
   
println(result.toString());
return result.toString();