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Rails PaperClip issue in SQL

The paperclip migration creates those 4 fields for internal use:

t.string   "image_file_name"
t.string   "image_content_type"
t.integer  "image_file_size"
t.datetime "image_updated_at" 

For Normal I get image through ORM direct call object.image but now I'm using SQL Raw Query, here I was unable to receive image URL and just getting nil column value.