Module | Sequel::Model::DatasetMethods |
In: |
lib/sequel/model/base.rb
|
Dataset methods are methods that the model class extends its dataset with in the call to set_dataset.
model | [RW] |
The model class associated with this dataset
Artist.dataset.model # => Artist |
Destroy each row in the dataset by instantiating it and then calling destroy on the resulting model object. This isn‘t as fast as deleting the dataset, which does a single SQL call, but this runs any destroy hooks on each object in the dataset.
Artist.dataset.destroy # DELETE FROM artists WHERE (id = 1) # DELETE FROM artists WHERE (id = 2) # ...
# File lib/sequel/model/base.rb, line 1417 1417: def destroy 1418: pr = proc{all{|r| r.destroy}.length} 1419: model.use_transactions ? @db.transaction(&pr) : pr.call 1420: end
This allows you to call to_hash without any arguments, which will result in a hash with the primary key value being the key and the model object being the value.
Artist.dataset.to_hash # SELECT * FROM artists # => {1=>#<Artist {:id=>1, ...}>, # 2=>#<Artist {:id=>2, ...}>, # ...}
# File lib/sequel/model/base.rb, line 1430 1430: def to_hash(key_column=nil, value_column=nil) 1431: if key_column 1432: super 1433: else 1434: raise(Sequel::Error, "No primary key for model") unless model and pk = model.primary_key 1435: super(pk, value_column) 1436: end 1437: end