instance method `column_alias_for`

Ruby on Rails 4.1.16

Since v3.0.20 Last seen in v6.1.7.10 Private

Available in: v3.0.20 v3.1.12 v3.2.22.5 v4.0.13 v4.1.16 v4.2.9 v5.2.8.1 v6.0.6 v6.1.7.10

Compare with:

column_alias_for(keys)

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"

Parameters

keys req

Source

# File activerecord/lib/active_record/relation/calculations.rb, line 352
    def column_alias_for(keys)
      if keys.respond_to? :name
        keys = "#{keys.relation.name}.#{keys.name}"
      end

      table_name = keys.to_s.downcase
      table_name.gsub!(/\*/, 'all')
      table_name.gsub!(/\W+/, ' ')
      table_name.strip!
      table_name.gsub!(/ +/, '_')

      @klass.connection.table_alias_for(table_name)
    end

Defined in activerecord/lib/active_record/relation/calculations.rb line 352 · View on GitHub · Improve this page · Find usages on GitHub

Defined in ActiveRecord::Calculations

Signature

Parameters