[英]Rails (postgres) query with jsonb array
My Product model has a jsonb field specs
(which we're managing using ActiveRecord's store_accessor
). 我的产品模型有一个jsonb字段
specs
(我们使用ActiveRecord的store_accessor
管理)。 Many of my products' specs have a spec in that hash called spec_options
. 我的许多产品的规格都有一个名为
spec_options
散列规范。
Before now, this spec_option
field was just text. 在此之前,此
spec_option
字段只是文本。 Now it needs to be an array. 现在它需要是一个数组。
The scope used before now to query products for this field was this: 之前用于查询此字段的产品的范围是:
scope :with_spec_options, ->(spec_options) {
where("'#{spec_options}'::jsonb \? (specs->>'spec_option')")
}
Ruby equivalent (just to help understand what this is doing): Ruby等价物(只是为了帮助理解这是做什么):
select{ |product| spec_options.include?(product.specs['spec_option']) }
ActiveRecord equivalent (if spec_option
were a regular column): ActiveRecord等价物(如果
spec_option
是常规列):
where(spec_option: spec_options)
However, now that specs['spec_options']
is an array, I can't do that. 但是,既然
specs['spec_options']
是一个数组,我不能这样做。 I think I need to use postgres' ?|
我想我需要使用postgres'
?|
jsonb operator, but I can't work out how to get the right side of this operation into the correct format. jsonb运算符,但我无法弄清楚如何将此操作的右侧转换为正确的格式。
Ruby equivalent: 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
Anyone got ideas? 有人有想法吗?
What you want to use is the @>
operator , which tests whether your left-hand value contains the right-hand value. 你想要使用的是
@>
运算符 ,它测试你的左手值是否包含右手值。 "Contains" works for both objects and arrays, so the following query would work: “包含”适用于对象和数组,因此以下查询将起作用:
SELECT * FROM products WHERE specs->'spec_options' @> '["spec1", "spec2"]';
Which I believe you can transform into ActiveRecord-compatible syntax like so: 我相信你可以转换成ActiveRecord兼容的语法,如下所示:
scope :with_spec_options, ->(spec_options) {
where("specs->'spec_option' @> ?", spec_options.to_json)
}
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