我正在使用Postgres的json数据类型，但想对嵌套在json中的数据进行查询/排序。
我想订购或查询json数据类型上的.where。例如，我要查询关注者数量> 500的用户，或者要按关注者或关注者数量进行订购。
谢谢！
例：
model User
data: {
"photos"=>[
{"type"=>"facebook", "type_id"=>"facebook", "type_name"=>"Facebook", "url"=>"facebook.com"}
],
"social_profiles"=>[
{"type"=>"vimeo", "type_id"=>"vimeo", "type_name"=>"Vimeo", "url"=>"http://vimeo.com/", "username"=>"v", "id"=>"1"},
{"bio"=>"I am not a person, but a series of plants", "followers"=>1500, "following"=>240, "type"=>"twitter", "type_id"=>"twitter", "type_name"=>"Twitter", "url"=>"http://www.twitter.com/", "username"=>"123", "id"=>"123"}
]
}
对于任何偶然发现的人。我想出了一个使用ActiveRecord和Postgres的JSON数据类型的查询列表。随时对其进行编辑以使其更加清晰。
以下使用的JSON运算符的文档：https : //www.postgresql.org/docs/current/functions-json.html。
# Sort based on the Hstore data:
Post.order("data->'hello' DESC")
=> #<ActiveRecord::Relation [
#<Post id: 4, data: {"hi"=>"23", "hello"=>"22"}>,
#<Post id: 3, data: {"hi"=>"13", "hello"=>"21"}>,
#<Post id: 2, data: {"hi"=>"3", "hello"=>"2"}>,
#<Post id: 1, data: {"hi"=>"2", "hello"=>"1"}>]>
# Where inside a JSON object:
Record.where("data ->> 'likelihood' = '0.89'")
# Example json object:
r.column_data
=> {"data1"=>[1, 2, 3],
"data2"=>"data2-3",
"array"=>[{"hello"=>1}, {"hi"=>2}],
"nest"=>{"nest1"=>"yes"}}
# Nested search:
Record.where("column_data -> 'nest' ->> 'nest1' = 'yes' ")
# Search within array:
Record.where("column_data #>> '{data1,1}' = '2' ")
# Search within a value that's an array:
Record.where("column_data #> '{array,0}' ->> 'hello' = '1' ")
# this only find for one element of the array.
# All elements:
Record.where("column_data ->> 'array' LIKE '%hello%' ") # bad
Record.where("column_data ->> 'array' LIKE ?", "%hello%") # good
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