在rails活动记录中查询mysql

Question

How would I convert this Mysql query to be run by rails active record?

SELECT * FROM opentimes WHERE id=1 AND open < NOW() AND closed > NOW();

Any help would be greatly appreciated thanks in advance.

Answer 1

OpenTimes.where(id: 1)
Assuming that you're following convention and ID is your primary key, you wouldn't need the second part of the query. Even then, here it is:
OpenTimes.where(id: 1, 'open < NOW() AND closed > NOW()')

Answer 2

Assuming your model name is OpenTime and columns are id, open and close. The corresponding active record query for above sql will be:

OpenTime.where("entity_id = ? AND created_at < ? AND updated_at > ?", 1, Time.now, Time.now)

Answer 3

Define a scope in your Opentime model:

class Opentime < ActiveRecord::Base
  ...
  scope :currently_open, -> { where('NOW() BETWEEN open AND closed') }
  ...
end

then you would use it like this:

Opentime.currently_open.where(id: 1)

Answer 4

ActiveRecord有find_by_sql方法，因此它可以简单地用作：

Opentime.find_by_sql("SELECT * FROM opentimes WHERE id=1 AND open < NOW() AND closed > NOW();")