我有两个感兴趣的专栏：
bought_time | product
-----------------------------------
1990-10-26T09:00:00Z | bicycle
1990-10-26T09:00:01Z | car
1990-10-26T09:13:22Z | bicycle
1990-10-26T09:26:11Z | cookies
1990-10-26T09:26:13Z | milk
1990-10-26T09:27:16Z | milk
我想在Ruby on Rails中创建一个SQLite查询，它将在被as_json转换后返回：
[{date by minute: 1990-10-26T09:00:00Z, bicycle: 1, car: 1, cookies:0, milk:0}, {date by minute: 1990-10-26T09:13:00Z, bicycle:1, car:0, cookies:0, milk:0}, {date by minute: 1990-10-26T09:26:00Z, bicycle:0, car:0, cookies:1, milk:1}, {date by minute: 1990-10-26T09:26:00Z, bicycle:0, car:0, cookies:0, milk:1} ]
到目前为止，我有类似的内容：
Bought.select("datetime((strftime('%s', date)/60)*60, 'unixepoch') interval, count(type)").where("date(date) >= date(:from) AND date(date) <= date(:to)", {from: event_params["from"], to: event_params["to"]}).order("interval").group("type").group("interval")
SQL中的哪个
SELECT datetime((strftime('%s', date)/60)*60, 'unixepoch') interval, count(type), type FROM "events" WHERE (date(date) >= date('1985-10-26T09:00:00Z') AND date(date) <= date('1985-10-27T09:00:00Z')) GROUP BY interval, "events"."type" ORDER BY interval
但是我不知道如何从这里开始。