在Rails Postgres中使用JSONB数据类型的查询
如何查询具有空的appointment_id的slot_details的日程表。 这是一个示例数据集：
id: 98, consulting_location_doctor_id: 498, schedule_date: Thu, 15 Jan 2015 00:00:00 IST +05:30, slot_details: [{"end"=>"2015-01-15T15:00:00.000+00:00", "start"=>"2015-01-15T14:30:00.000+00:00", "title"=>" 2:30 pm to 3:00 pm", appointment_id: ""}, {"end"=>"2015-01-15T15:30:00.000+00:00", "start"=>"2015-01-15T15:00:00.000+00:00", "title"=>" 3:00 pm to 3:30 pm", appointment_id: ""}, {"end"=>"2015-01-15T16:00:00.000+00:00", "start"=>"2015-01-15T15:30:00.000+00:00", "title"=>" 3:30 pm to 4:00 pm", appointment_id: ""}, {"end"=>"2015-01-15T16:30:00.000+00:00", "start"=>"2015-01-15T16:00:00.000+00:00", "title"=>" 4:00 pm to 4:30 pm", appointment_id: ""}, {"end"=>"2015-01-15T17:00:00.000+00:00", "start"=>"2015-01-15T16:30:00.000+00:00", "title"=>" 4:30 pm to 5:00 pm", appointment_id: ""}, {"end"=>"2015-01-15T17:30:00.000+00:00", "start"=>"2015-01-15T17:00:00.000+00:00", "title"=>" 5:00 pm to 5:30 pm", appointment_id: ""}, {"end"=>"2015-01-15T18:00:00.000+00:00", "start"=>"2015-01-15T17:30:00.000+00:00", "title"=>" 5:30 pm to 6:00 pm", appointment_id: ""}, {"end"=>"2015-01-15T18:30:00.000+00:00", "start"=>"2015-01-15T18:00:00.000+00:00", "title"=>" 6:00 pm to 6:30 pm", appointment_id: ""}, {"end"=>"2015-01-15T19:00:00.000+00:00", "start"=>"2015-01-15T18:30:00.000+00:00", "title"=>" 6:30 pm to 7:00 pm", appointment_id: ""}, {"end"=>"2015-01-15T19:30:00.000+00:00", "start"=>"2015-01-15T19:00:00.000+00:00", "title"=>" 7:00 pm to 7:30 pm", appointment_id: ""}, {"end"=>"2015-01-15T20:00:00.000+00:00", "start"=>"2015-01-15T19:30:00.000+00:00", "title"=>" 7:30 pm to 8:00 pm", appointment_id: ""}, {"end"=>"2015-01-15T20:30:00.000+00:00", "start"=>"2015-01-15T20:00:00.000+00:00", "title"=>" 8:00 pm to 8:30 pm", appointment_id: ""}, {"end"=>"2015-01-15T21:00:00.000+00:00", "start"=>"2015-01-15T20:30:00.000+00:00", "title"=>" 8:30 pm to 9:00 pm", appointment_id: ""}, {"end"=>"2015-01-15T21:30:00.000+00:00", "start"=>"2015-01-15T21:00:00.000+00:00", "title"=>" 9:00 pm to 9:30 pm", appointment_id: ""}, {"end"=>"2015-01-15T22:00:00.000+00:00", "start"=>"2015-01-15T21:30:00.000+00:00", "title"=>" 9:30 pm to 10:00 pm", appointment_id: ""}, {"end"=>"2015-01-15T22:30:00.000+00:00", "start"=>"2015-01-15T22:00:00.000+00:00", "title"=>"10:00 pm to 10:30 pm", appointment_id: ""}, {"end"=>"2015-01-15T23:00:00.000+00:00", "start"=>"2015-01-15T22:30:00.000+00:00", "title"=>"10:30 pm to 11:00 pm", appointment_id: ""}, {"end"=>"2015-01-15T23:30:00.000+00:00", "start"=>"2015-01-15T23:00:00.000+00:00", "title"=>"11:00 pm to 11:30 pm", appointment_id: ""}, {"end"=>"2015-01-16T00:00:00.000+00:00", "start"=>"2015-01-15T23:30:00.000+00:00", "title"=>"11:30 pm to 12:00 am", appointment_id: ""}], start_and_end_time: Thu, 15 Jan 2015...Fri, 16 Jan 2015, deleted_at: nil, deleted_by_id: nil, created_at: Tue, 30 Dec 2014 04:28:06 IST +05:30, updated_at: Tue, 30 Dec 2014 04:28:06 IST +05:30> 我也在导游中尝试了这个例子。 没有关于json数组查询的示例。 请帮忙。
也许这可以帮助你：
slot -> 'slot_details' @> '[{"end"=>"2015-01-15T20:00:00.000+00:00"}]'
想法是询问是否包含部分子arrays。 如果你不在一个对象的数组包中，它将改为（假设我们有一个配置文件对象）：
profile -> 'basics' @> '{"name":"john"}'
不要被愚弄试图使用? 这里代替@>