instance method
delete_all
Ruby on Rails 4.2.9
Since v3.0.20Signature
delete_all(conditions = nil)Deletes the records matching conditions without instantiating the records first, and hence not calling the destroy method nor invoking callbacks. This is a single SQL DELETE statement that goes straight to the database, much more efficient than destroy_all. Be careful with relations though, in particular :dependent rules defined on associations are not honored. Returns the number of rows affected.
Post.delete_all("person_id = 5 AND (category = 'Something' OR category = 'Else')")
Post.delete_all(["person_id = ? AND (category = ? OR category = ?)", 5, 'Something', 'Else'])
Post.where(person_id: 5).where(category: ['Something', 'Else']).delete_all
Both calls delete the affected posts all at once with a single DELETE statement. If you need to destroy dependent associations or call your before_* or after_destroy callbacks, use the destroy_all method instead.
If an invalid method is supplied, delete_all raises an ActiveRecord error:
Post.limit(100).delete_all
# => ActiveRecord::ActiveRecordError: delete_all doesn't support limit
Parameters
-
conditionsopt = nil
Source
# File activerecord/lib/active_record/relation.rb, line 452
def delete_all(conditions = nil)
invalid_methods = INVALID_METHODS_FOR_DELETE_ALL.select { |method|
if MULTI_VALUE_METHODS.include?(method)
send("#{method}_values").any?
else
send("#{method}_value")
end
}
if invalid_methods.any?
raise ActiveRecordError.new("delete_all doesn't support #{invalid_methods.join(', ')}")
end
if conditions
where(conditions).delete_all
else
stmt = Arel::DeleteManager.new(arel.engine)
stmt.from(table)
if joins_values.any?
@klass.connection.join_to_delete(stmt, arel, table[primary_key])
else
stmt.wheres = arel.constraints
end
bvs = arel.bind_values + bind_values
affected = @klass.connection.delete(stmt, 'SQL', bvs)
reset
affected
end
end
Defined in activerecord/lib/active_record/relation.rb line 452
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Defined in ActiveRecord::Relation