instance method
update_all
Ruby on Rails 6.1.7.10
Since v3.0.20Signature
update_all(updates)Updates all records in the current relation with details given. This method constructs a single SQL UPDATE statement and sends it straight to the database. It does not instantiate the involved models and it does not trigger Active Record callbacks or validations. However, values passed to #update_all will still go through Active Record’s normal type casting and serialization. Returns the number of rows affected.
Note: As Active Record callbacks are not triggered, this method will not automatically update updated_at/updated_on columns.
Parameters
-
updates- A string, array, or hash representing the SET part of an SQL statement.
Examples
# Update all customers with the given attributes
Customer.update_all wants_email: true
# Update all books with 'Rails' in their title
Book.where('title LIKE ?', '%Rails%').update_all(author: 'David')
# Update all books that match conditions, but limit it to 5 ordered by date
Book.where('title LIKE ?', '%Rails%').order(:created_at).limit(5).update_all(author: 'David')
# Update all invoices and set the number column to its id value.
Invoice.update_all('number = id')
Parameters
-
updatesreq
Source
# File activerecord/lib/active_record/relation.rb, line 440
def update_all(updates)
raise ArgumentError, "Empty list of attributes to change" if updates.blank?
arel = eager_loading? ? apply_join_dependency.arel : build_arel
arel.source.left = table
stmt = Arel::UpdateManager.new
stmt.table(arel.source)
stmt.key = table[primary_key]
stmt.take(arel.limit)
stmt.offset(arel.offset)
stmt.order(*arel.orders)
stmt.wheres = arel.constraints
if updates.is_a?(Hash)
if klass.locking_enabled? &&
!updates.key?(klass.locking_column) &&
!updates.key?(klass.locking_column.to_sym)
attr = table[klass.locking_column]
updates[attr.name] = _increment_attribute(attr)
end
stmt.set _substitute_values(updates)
else
stmt.set Arel.sql(klass.sanitize_sql_for_assignment(updates, table.name))
end
klass.connection.update(stmt, "#{klass} Update All").tap { reset }
end
Defined in activerecord/lib/active_record/relation.rb line 440
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Defined in ActiveRecord::Relation