使用 jsonb 数组的 Rails (postgres) 查询 [英] Rails (postgres) query with jsonb array

问题描述

我的产品模型有一个 jsonb 字段 specs(我们使用 ActiveRecord 的 store_accessor 对其进行管理).我的许多产品的规格都有一个名为 spec_options 的散列规格.

My Product model has a jsonb field specs (which we're managing using ActiveRecord's store_accessor). Many of my products' specs have a spec in that hash called spec_options.

在此之前，这个 spec_option 字段只是文本.现在它需要是一个数组.

Before now, this spec_option field was just text. Now it needs to be an array.

之前用于查询此字段的产品的范围是:

The scope used before now to query products for this field was this:

scope :with_spec_options, ->(spec_options) { 
    where("'#{spec_options}'::jsonb ? (specs->>'spec_option')") 
}

Ruby 等价物(只是为了帮助理解它在做什么):

Ruby equivalent (just to help understand what this is doing):

select{ |product| spec_options.include?(product.specs['spec_option']) }

ActiveRecord 等效项(如果 spec_option 是常规列):

ActiveRecord equivalent (if spec_option were a regular column):

where(spec_option: spec_options)

然而，既然 specs['spec_options'] 是一个数组，我不能那样做.我想我需要使用 postgres 的 ?| jsonb 操作符，但我不知道如何将这个操作的右边变成正确的格式.

However, now that specs['spec_options'] is an array, I can't do that. I think I need to use postgres' ?| jsonb operator, but I can't work out how to get the right side of this operation into the correct format.

Ruby 等价物:

def self.with_spec_options(spec_options)
    all.select{|product| 
        if product.specs['spec_options'].present?
            product.specs['spec_options'].any?{|option|
                spec_options.include?(option)
            }
        else
            false
        end
    }
end

有人有想法吗?

推荐答案

你想要使用的是 @> 运算符，用于测试您的左侧值是否包含右侧值.包含"适用于对象和数组，因此以下查询将适用:

What you want to use is the @> operator, which tests whether your left-hand value contains the right-hand value. "Contains" works for both objects and arrays, so the following query would work:

SELECT * FROM products WHERE specs->'spec_options' @> '["spec1", "spec2"]';

我相信您可以像这样转换为与 ActiveRecord 兼容的语法:

Which I believe you can transform into ActiveRecord-compatible syntax like so:

scope :with_spec_options, ->(spec_options) { 
  where("specs->'spec_option' @> ?", spec_options.to_json) 
}

这篇关于使用 jsonb 数组的 Rails (postgres) 查询的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！