diff options
Diffstat (limited to 'activerecord/lib/active_record/relation/calculation_methods.rb')
| -rw-r--r-- | activerecord/lib/active_record/relation/calculation_methods.rb | 172 |
1 files changed, 0 insertions, 172 deletions
diff --git a/activerecord/lib/active_record/relation/calculation_methods.rb b/activerecord/lib/active_record/relation/calculation_methods.rb deleted file mode 100644 index 91de89e607..0000000000 --- a/activerecord/lib/active_record/relation/calculation_methods.rb +++ /dev/null @@ -1,172 +0,0 @@ -module ActiveRecord - module CalculationMethods - - def count(*args) - calculate(:count, *construct_count_options_from_args(*args)) - end - - def average(column_name) - calculate(:average, column_name) - end - - def minimum(column_name) - calculate(:minimum, column_name) - end - - def maximum(column_name) - calculate(:maximum, column_name) - end - - def sum(column_name) - calculate(:sum, column_name) - end - - def calculate(operation, column_name, options = {}) - operation = operation.to_s.downcase - - if operation == "count" - joins = arel.joins(arel) - if joins.present? && joins =~ /LEFT OUTER/i - distinct = true - column_name = @klass.primary_key if column_name == :all - end - - distinct = nil if column_name.to_s =~ /\s*DISTINCT\s+/i - distinct ||= options[:distinct] - else - distinct = nil - end - - distinct = options[:distinct] || distinct - column_name = :all if column_name.blank? && operation == "count" - - if @group_values.any? - return execute_grouped_calculation(operation, column_name) - else - return execute_simple_calculation(operation, column_name, distinct) - end - rescue ThrowResult - 0 - end - - private - - def execute_simple_calculation(operation, column_name, distinct) #:nodoc: - column = if @klass.column_names.include?(column_name.to_s) - Arel::Attribute.new(@klass.unscoped, column_name) - else - Arel::SqlLiteral.new(column_name == :all ? "*" : column_name.to_s) - end - - relation = select(operation == 'count' ? column.count(distinct) : column.send(operation)) - type_cast_calculated_value(@klass.connection.select_value(relation.to_sql), column_for(column_name), operation) - end - - def execute_grouped_calculation(operation, column_name) #:nodoc: - group_attr = @group_values.first - association = @klass.reflect_on_association(group_attr.to_sym) - associated = association && association.macro == :belongs_to # only count belongs_to associations - group_field = associated ? association.primary_key_name : group_attr - group_alias = column_alias_for(group_field) - group_column = column_for(group_field) - - group = @klass.connection.adapter_name == 'FrontBase' ? group_alias : group_field - - aggregate_alias = column_alias_for(operation, column_name) - - select_statement = if operation == 'count' && column_name == :all - "COUNT(*) AS count_all" - else - Arel::Attribute.new(@klass.unscoped, column_name).send(operation).as(aggregate_alias).to_sql - end - - select_statement << ", #{group_field} AS #{group_alias}" - - relation = select(select_statement).group(group) - - calculated_data = @klass.connection.select_all(relation.to_sql) - - if association - key_ids = calculated_data.collect { |row| row[group_alias] } - key_records = association.klass.base_class.find(key_ids) - key_records = key_records.inject({}) { |hsh, r| hsh.merge(r.id => r) } - end - - calculated_data.inject(ActiveSupport::OrderedHash.new) do |all, row| - key = type_cast_calculated_value(row[group_alias], group_column) - key = key_records[key] if associated - value = row[aggregate_alias] - all[key] = type_cast_calculated_value(value, column_for(column_name), operation) - all - end - end - - def construct_count_options_from_args(*args) - options = {} - column_name = :all - - # Handles count(), count(:column), count(:distinct => true), count(:column, :distinct => true) - case args.size - when 0 - select = get_projection_name_from_chained_relations - column_name = select if select !~ /(,|\*)/ - when 1 - if args[0].is_a?(Hash) - select = get_projection_name_from_chained_relations - column_name = select if select !~ /(,|\*)/ - 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 - - # 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" - 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 - - def column_for(field) - field_name = field.to_s.split('.').last - @klass.columns.detect { |c| c.name.to_s == field_name } - end - - def type_cast_calculated_value(value, column, operation = nil) - case operation - when 'count' then value.to_i - when 'sum' then type_cast_using_column(value || '0', column) - when 'average' then value && (value.is_a?(Fixnum) ? value.to_f : value).to_d - else type_cast_using_column(value, column) - end - end - - def type_cast_using_column(value, column) - column ? column.type_cast(value) : value - end - - def get_projection_name_from_chained_relations - @select_values.join(", ") if @select_values.present? - end - - end -end |