method

column_alias_for

v3.2.1 - Show latest stable - 0 notes - Class: ActiveRecord::Calculations

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What's this?

column_alias_for(*keys) private

Converts the given keys to the value that the database adapter returns as a usable column name:

column_alias_for("users.id")                 # => "users_id"
column_alias_for("sum(id)")                  # => "sum_id"
column_alias_for("count(distinct users.id)") # => "count_distinct_users_id"
column_alias_for("count(*)")                 # => "count_all"
column_alias_for("count", "id")              # => "count_id"

Show source

# File activerecord/lib/active_record/relation/calculations.rb, line 305
    def column_alias_for(*keys)
      table_name = keys.join(' ')
      table_name.downcase!
      table_name.gsub!(/\*/, 'all')
      table_name.gsub!(/\W+/, ' ')
      table_name.strip!
      table_name.gsub!(/ +/, '_')

      @klass.connection.table_alias_for(table_name)
    end

column_alias_for

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