Displaying 1 result from an estimated 1 matches for "t4_id".
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t1_id
2006 Apr 05
0
Fancy MySQL footwork
...-------+-------+
| id | t2_id | t3_id |
+----+-------+-------+
| 1 | 1 | null |
| 2 | null | 1 |
| 3 | null | 2 |
+----+-------+-------+
select * from t2;
+----+-------+
| id | title |
+----+-------+
| 1 | "hat" |
+----+-------+
select * from t3;
+----+-------+
| id | t4_id |
+----+-------+
| 1 | 1 |
| 2 | 2 |
| 3 | 1 |
| 4 | 1 |
| 5 | 2 |
+----+-------+
select * from t4;
+----+-------+
| id | title |
+----+-------+
| 1 | "cat" |
| 2 | "rat" |
+----+-------+
with corresponding Rails models:
t1
belongs_to :t2
belo...