Postgres JSON data type Rails query

Question

I am using Postgres\' json data type but want to do a query/ordering with data that is nested within the json.

I want to order or query with .where on the json data

Answer 1

For any who stumbles upon this. I have come up with a list of queries using ActiveRecord and Postgres' JSON data type. Feel free to edit this to make it more clear.

Documentation to the JSON operators used below: https://www.postgresql.org/docs/current/functions-json.html.

# Sort based on the Hstore data:
Post.order("data->'hello' DESC")
=> #"23", "hello"=>"22"}>, 
    #"13", "hello"=>"21"}>, 
    #"3", "hello"=>"2"}>, 
    #"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