Class: ActiveRecord::ColumnMetadata

Inherits:
Object
  • Object
show all
Defined in:
lib/active_record/column_metadata/read.rb,
lib/active_record/column_metadata/version.rb

Constant Summary collapse

VERSION = 
"0.0.2"

Class Method Summary collapse

Class Method Details

.to_a(table_name) ⇒ Object

Retrieves metadata stored in the database for table_name as

[“col_name”, => “val”], …


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# File 'lib/active_record/column_metadata/read.rb', line 7

def self.to_a(table_name)
  res = ActiveRecord::Base.connection.query(<<-END_SQL, 'Get comments')
    SELECT a.attname,
           pg_catalog.col_description(a.attrelid, a.attnum)
      FROM pg_catalog.pg_attribute a
     WHERE a.attrelid = '#{table_name}'::regclass
       AND a.attnum > 0
       AND NOT a.attisdropped
  ORDER BY a.attname
  END_SQL
  res.map{ |tupple| [tupple.first, JSON.parse(tupple.last)] unless tupple.last.nil? }.compact
end