[Rails] matching roll_no then loop 3 times, next loop..

Hi, I am beginner RoR. I need your advanced programming...

@rollresults = RollResult.where(:banker_id =>'3')
----------------------------
| banker_id | roll_no |
----------------------------
| 3 | 332 |
----------------------------
| 3 | 512 | <-- when roll_no match '512'
----------------------------
| 3 | 332 | -|
----------------------------
| 3 | 512 | > listing them 3 times
----------------------------
| 3 | 512 | -|
----------------------------
| 3 | 332 |
----------------------------
| 3 | 332 |
----------------------------
| 3 | 512 | <-- when roll_no match '512'
----------------------------
| 3 | 264 | -|
----------------------------
| 3 | 332 | > listing them 3 times
----------------------------
| 3 | 666 | -|
----------------------------

The output I want as below:
----------------------------
| banker_id | roll_no |
----------------------------
| 3 | 332 |
----------------------------
| 3 | 512 |
----------------------------
| 3 | 512 |
----------------------------

----------------------------
| 3 | 264 |
----------------------------
| 3 | 332 |
----------------------------
| 3 | 666 |
----------------------------

Please help me...

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