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module ActiveRecord
module RelationalCalculations
def count(*args)
column_name, options = construct_count_options_from_args(*args)
distinct = options[:distinct] ? true : false
column = if @klass.column_names.include?(column_name.to_s)
Arel::Attribute.new(@relation.table, column_name)
else
Arel::SqlLiteral.new(column_name == :all ? "*" : column_name.to_s)
end
relation = select(column.count(distinct))
@klass.connection.select_value(relation.to_sql).to_i
end
private
def construct_count_options_from_args(*args)
options = {}
column_name = :all
# We need to handle
# count()
# count(:column_name=:all)
# count(options={})
# count(column_name=:all, options={})
# selects specified by scopes
# TODO : relation.projections only works when .select() was last in the chain. Fix it!
case args.size
when 0
column_name = @relation.send(:select_clauses).join(', ') if @relation.respond_to?(:projections) && @relation.projections.present?
when 1
if args[0].is_a?(Hash)
column_name = @relation.send(:select_clauses).join(', ') if @relation.respond_to?(:projections) && @relation.projections.present?
options = args[0]
else
column_name = args[0]
end
when 2
column_name, options = args
else
raise ArgumentError, "Unexpected parameters passed to count(): #{args.inspect}"
end
[column_name || :all, options]
end
end
end
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