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.

Methods

destroy   to_hash  

Attributes

model  [RW]  The model class associated with this dataset
  Artist.dataset.model # => Artist

Public Instance methods

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)
  # ...

[Source]

      # File lib/sequel/model/base.rb, line 1424
1424:       def destroy
1425:         pr = proc{all{|r| r.destroy}.length}
1426:         model.use_transactions ? @db.transaction(&pr) : pr.call
1427:       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, ...}>,
  #     ...}

[Source]

      # File lib/sequel/model/base.rb, line 1437
1437:       def to_hash(key_column=nil, value_column=nil)
1438:         if key_column
1439:           super
1440:         else
1441:           raise(Sequel::Error, "No primary key for model") unless model and pk = model.primary_key
1442:           super(pk, value_column) 
1443:         end
1444:       end

[Validate]