To achieve this requirement, we will be using two Chatter objects viz. Feed Item and Feed Comment. ‘Feed Item’ records are the posts created by a User and the ‘Feed Comment’ records are the comments on that post.

In other words, our requirement is to insert a random ‘Feed Comment’ record, whenever a ‘Feed Item’ record is inserted.

The Trigger should be written with the following flow:

1. Define the Trigger
2. Create a list for DML (last step)
3. Create a List of ‘Strings’/ Comments
4. Get a Random comment from the List in Step 3
5. Iterate through each Feed Item record in the List from Step 2. and add the random comment.
6. DML to insert List of newly created records

Now lets go through each step once again and write its respective code.

trigger randomChatterComment on FeedItem (after insert) {

    //Create a list to hold the list of Feed Comment records being inserted
    List<FeedComment> List2insert = New list<FeedComment>();

//Create a list of Strings
    List<String> commentList = New List<String>{
        'Congratulations and BRAVO!',
            'This calls for celebrating! Congratulations!',
            'You did it! So proud of you!',
            'I knew it was only a matter of time. Well done!',
            'Congratulations on your well-deserved success.',
            'Heartfelt congratulations to you.',
            'Warmest congratulations on your achievement.',
            'Congratulations and best wishes for your next adventure!',
            'So pleased to see you accomplishing great things.',
            'Feeling so much joy for you today. What an impressive achievement!',
            'You’ve worked so hard for this. Congrats!',
            'This is awesome! You’re awesome! Way to go!',
            'Here’s to your streak! Keep it up!',
            'Sincere congratulations on your hard-earned success',
            'You are proof that good things come to those who are willing to sacrifice to reach a worthwhile goal. Words can’t express how proud I am!',
            'You have the creativity and determination to do whatever you can dream. I hope you feel proud today and confident in your ability to rise to your next challenge.',
            'Celebrating the dedication you’ve shown on the way to this achievement. You’ve earned every bit of the success you’re enjoying.',
            'Congrats!!!'           
            };

//Get a random number which is less than the size of the above list
   Integer i = (Math.random()* (commentList.size() -1)).intvalue();

    //iterate through each feed item record and add the comments
    For (FeedItem FIR:Trigger.new) { 
        //check if the post contains the word "Success"
        If (FIR.Body.contains('success')) {
            FeedComment FC = New FeedComment(); 
            FC.CommentBody = commentList.get(i);//add a random comment from the comment list using the random number generated earlier
            FC.FeedItemID = FIR.id;
            FC.CreatedById = '005f4000002NG0g'; //ID of user who will be commenting
            List2insert.add(fc); //add to final list of comments that needs to be inserted
        }
    }

Insert List2insert; // insert the final list of comments

The complete trigger to post a random chatter comment will be as follows:

trigger randomChatterComment on FeedItem (after insert) {
    
    //Create a list to hold the list of Feed Comment records being inserted
    List<FeedComment> List2insert = New list<FeedComment>();
    
    //Create a list of comments
    List<String> commentList = New List<String>{
        'Congratulations and BRAVO!',
            'This calls for celebrating! Congratulations!',
            'You did it! So proud of you!',
            'I knew it was only a matter of time. Well done!',
            'Congratulations on your well-deserved success.',
            'Heartfelt congratulations to you.',
            'Warmest congratulations on your achievement.',
            'Congratulations and best wishes for your next adventure!',
            'So pleased to see you accomplishing great things.',
            'Feeling so much joy for you today. What an impressive achievement!',
            'You’ve worked so hard for this. Congrats!',
            'This is awesome! You’re awesome! Way to go!',
            'Here’s to your streak! Keep it up!',
            'Sincere congratulations on your hard-earned success',
            'You are proof that good things come to those who are willing to sacrifice to reach a worthwhile goal. Words can’t express how proud I am!',
            'You have the creativity and determination to do whatever you can dream. I hope you feel proud today and confident in your ability to rise to your next challenge.',
            'Celebrating the dedication you’ve shown on the way to this achievement. You’ve earned every bit of the success you’re enjoying.',
            'Congrats!!!'           
            };
                //Get a random number which is less than the size of the above list
                Integer i = (Math.random()* (commentList.size() -1)).intvalue();
    
    //iterate through each feed item record and add the comments
    For (FeedItem FIR:trigger.new) { 
        //check if the post contains the word "Success"
        If (FIR.Body.contains('success')) {
            FeedComment FC = New FeedComment(); 
            FC.CommentBody = commentList.get(i);//add a random comment from the comment list using the random number generated earlier
            FC.FeedItemID = FIR.id;
            FC.CreatedById = '005f4000002NG0g'; //ID of user who will be commenting
            List2insert.add(fc); //add to final list of comments that needs to be inserted
        }
    }
    Insert List2insert; // insert the final list of comments
    
}

This post is dedicated to learning Salesforce triggers with examples and scenarios by dissecting them line by line. All triggers will be written with plenty of comments and explanations so that its easier for us to understand and implement.

• Write Your First Hello World Salesforce Apex Trigger – Triggers for Beginners

The “Hello World” program is the simplest program used to illustrate the basic syntax of a programming language. The program outputs “Hello World” and is traditionally the first program written by all beginner developers. Our Hello World trigger’s requirement is: When a Lead is updated, update the lead’s first name to ‘Hello’ and the last name to ‘World’

• Trigger to Change the Stage when an Opportunity is created

Every time an Opportunity is created (and the user selects any Stage), the Opportunity Stage should change and default to Prospecting.

• Trigger to create a task when an Opportunity is updated

When an Opportunity is updated, a new Task should be created and assigned to the Opportunity Owner. The status of the task should be “In Progress”

• Trigger to create a roll-up summary of Contact’s fields on Accounts

On each Account, the Total Salary custom field should hold the sum of Salaries from its associated Contacts. The trigger should work whenever a Contact’s Salary is updated, New Contact is Created or when an existing Contact is deleted.

• Trigger to Prevent Duplicate Contacts

When a Contact is being created and if a record with the same Email Id or Phone number exists, the trigger should throw an error and the User should not be allowed to create the Duplicate Contact

• Trigger to Post Automated Random Chatter Comment

When a user posts to chatter and if the user’s post contains the term “Success”, an automated comment should be posted. This comment should be randomly selected from a list of comments; And should be posted as a specific user.

Please support this post by linking it from your website/blog
http://www.syedtaha.com/salesforce-apex-triggers/learn-salesforce-triggers-with-examples-and-scenarios/1072/

There are times when an Administrator needs to manually setup a users password in Salesforce. Salesforce Administrator’s can reset a User’s password from the User record detail page but Salesforce user interface doesn’t allow an Administrator to setup a specific password. Here is an Awesome Admin Hack to achieved this using the Developer Console or the Workbench.

Let’s discuss each method step by step.

Manually Setup a User’s Password in Salesforce Using the Developer Console.

Step 1. Get the User’s Id from the URL bar on the User’s record detail page.

Step 2. Open Developer Console

Step 3. Open the Execute Anonymous Window from Debug >> Open Execute Anonymous Window OR using the shortcut Ctrl + E

Step 4. Enter the following Apex code. Replace the UserId and Password with the actual values we need.

System.SetPassword('UserId','Password'); //Replace the UserId and Password

Step 5. Click Execute

We successfully manually setup the User’s password using the developer console and an email with the new security token will is emailed to the User.

Manually Setup a User’s Password in Salesforce Using Workbench.

1. Visit Workbench (https://workbench.developerforce.com/login.php) and Login using your Salesforce credentials.
2. Navigate to Utilities >> Password Management
3. Enter the User’s Id and the New Password
4. Click on Change Password

We successfully manually setup the User’s password using Workbench and an email with the new security token will is emailed to the User.

Pro Tip: Creating a User Interface to manually setup a User’s password in Salesforce.

Step 1. Create a New Text Field on the User Object and Name it Password__c

Step 2. Create the following trigger on the User object

trigger setPassword on User (before update) {
    for (User u:Trigger.New) {
        User oldUser = Trigger.OldMap.get(u.id);
        If ((u.Password__c != null) && (oldUser.Password__c != u.Password__c)) {
            System.SetPassword(u.id,u.password__c);
            //Uncomment below line to clear password field
            //u.Password__c = null;
        }    
    }
}

Note: Use validation rules on Password__c to only accept passwords that align with your organization’s password policies.

Here’s how the trigger looks in the developer console (image)

Step 3. Now visit the User’s record detail page and enter the new password in the Password field that we created and click Save.

The User’s password will be changed and an email with the new security token will be emailed to the User.

Update: To send the new password to the user by email, the trigger will be:

trigger CPTsetPassword on User (before update) {
    List <String> toAddresses = New List <String>();
    for (User u:Trigger.New) {
        User oldUser = Trigger.OldMap.get(u.id);
        If ((u.Password__c != null) && (oldUser.Password__c != u.Password__c)) {
            System.SetPassword(u.id,u.password__c);
            toAddresses.add(u.Email);
            //Uncomment below line to clear password field after reset
            //u.Password__c = null;   
            
            //Sending the users new password by email
            Messaging.SingleEmailMessage mail = new Messaging.SingleEmailMessage();
            mail.setToAddresses(toAddresses);
            mail.setSubject('Salesforce Password Reset');
            mail.setPlaintextBody('Your password was reset by the Administrator and the new Password is ' + u.Password__c);
            Messaging.sendEmail(new Messaging.SingleEmailMessage[] {mail});         
        }    
    } 
}