Rails 和 Blazer 2 折线图

如何解决Rails 和 Blazer 2 折线图

如果有人熟悉 Blazer / sql，我真的可以使用您的帮助：

我正在尝试在 Blazer 中创建折线图 => https://blazer.dokkuapp.com/queries/5-line-chart-format-2

我想绘制 [qikpac_id] 和 [ reading_values.value ]

但需要过滤阅读类型什么是“soc”@

WHERE reading_types.value = 'soc'

所以我最终有 4 列，我只想要

Y 轴为 reading_values.value

X 作为阅读时间

Qikpacs 作为绘图值

sql 查询到此为止：

SELECT
-- ## comented ## date_trunc('minute',reading_time)::date AS minute,reading_time,reading_types.value as Reading_Type,reading_values.value as Reading_Value,qikpac_id as Qikpac 
FROM reading_values
INNER JOIN reading_types
ON reading_values.reading_type_id = reading_types.id
JOIN battery_statuses
ON reading_values.battery_status_id = battery_statuses.id
JOIN battery_readings
ON reading_values.battery_reading_id = battery_readings.id
WHERE reading_types.value = 'soc'
ORDER BY 1

这让我：

| reading_time | reading_type | reading_value |  qikpac_id | 
2021-05-30 09:10:33 +1000   soc     49  13
2021-05-30 09:16:33 +1000   soc     49  14
2021-05-30 09:24:33 +1000   soc     49  15
2021-05-30 09:35:33 +1000   soc     49  16
2021-05-30 09:48:33 +1000   soc     49  13
2021-05-30 09:55:33 +1000   soc     49  14
2021-05-30 10:06:33 +1000   soc     49  15
2021-05-30 10:19:33 +1000   soc     49  16

谢谢，我很困.. :)

解决方法

对于在下面搜索 Blazer 的任何人来说，答案就是：

您需要通过以下方式订购： 3 列 - 时间戳、字符串、数字

而且 Blazer 对顺序和类型非常严格，否则你将无法像我一样快速到达。

--      3 columns - timestamp,string,numeric
SELECT
date_trunc('minute',battery_readings.reading_time)::timestamp AS minute,qikpacs.serial_number as Qikpac,reading_values.value as Reading_Value

FROM reading_values
INNER JOIN reading_types
ON reading_values.reading_type_id = reading_types.id
JOIN battery_statuses
ON reading_values.battery_status_id = battery_statuses.id
JOIN battery_readings
ON reading_values.battery_reading_id = battery_readings.id
JOIN qikpacs
ON battery_readings.qikpac_id = qikpacs.id
WHERE reading_types.value = 'soc'
AND ( qikpacs.serial_number = 'QP016' )
GROUP BY battery_readings.reading_time,qikpacs.serial_number,reading_values.value
ORDER BY battery_readings.reading_time,reading_values.value

image of graph