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Asked: 2026-06-14T04:50:54+00:00

I’m a newbie to rails.I have a model called OfflineExport. In the table I

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I’m a newbie to rails.I have a model called OfflineExport. In the table I have data like this

#<OfflineExport id: 2, 
  parameters: 
      {"project_id"=>"3", 
       "type"=>"submissions", 
       "filters"=>{"task_type"=>"", 
       "corrections"=>"", "grade"=>"", 
       "min_duration"=>"", "after"=>"", 
       "max_duration"=>"", "reviews"=>"", 
       "before"=>""}, 
  "send_email"=>"true", 
  "options"=>{"offline_record_id"=>2}}>

Am trying to fetch parameters[“project_id”] in where clause like

 OfflineExport.where("parameters[project_id] = '3'")

But am getting error like:

ActiveRecord::StatementInvalid: PGError: ERROR:  cannot subscript type text because it is not an array

can anyone help me in solving this?

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1 Answer

  1. Editorial Team

    It seems that you have a serialized column in your model. Something like this: serialize :parameters. This means the data is stored in the database not in an easily readable format, which leads that you can not query on it. Same as here.

    Solution: extract the field you want to query on, and make a column for it.

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