method

column_alias_for

v2.1.0 - Show latest stable - 0 notes - Class: ActiveRecord::Calculations::ClassMethods

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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/calculations.rb, line 256
        def column_alias_for(*keys)
          connection.table_alias_for(keys.join(' ').downcase.gsub(/\*/, 'all').gsub(/\W+/, ' ').strip.gsub(/ +/, '_'))
        end

column_alias_for

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