我对ruby / rails很新。我有一个AR查询，在postgres-突变和效果中连接2个表。突变有很多影响。 该查询的结果类似于：
mutation_id | chr | pos | gene | eff_impact | eff_transcript
---------------------------------------------------------------------
1 | 1 | 123 | JAK | bad | tx123
1 | 1 | 123 | JAK | worse | tx456
2 | 4 | 456 | KRAS | fine | tx234
2 | 4 | 456 | KRAS | scary | tx483
3 | 7 | 789 | SMURF | helpful | tx987
这给了我一个平坦的结果集，其中包含来自突变表的重复值，因为突变有很多影响。
我最终需要的是一个具有树结构的哈希数组，如下所示：
[
{"mutation_id" => 1,
"chr" => 1,
"pos" => 123,
"gene" => "JAK",
"effects" => [
{"eff_impact" => "bad", "eff_transcript" => "tx123"},
{"eff_impact" => "worse", "eff_transcript" => "tx456"},
]
},
{"mutation_id" => 2,
"chr" => 4,
"pos" => 546,
"gene" => "KRAS",
"effects" => [
{"eff_impact" => "fine", "eff_transcript" => "tx234"},
{"eff_impact" => "scary", "eff_transcript" => "tx483"},
]
},
{"mutation_id" => 3,
"chr" => 7,
"pos" => 546,
"gene" => "SMURF",
"effects" => [
{"eff_impact" => "helpful", "eff_transcript" => "tx987"}
]
}
]
结果是~100k行。如果可能的话，我更希望初始查询返回具有此树结构的AR结果。
由于