Module: Sequel::Model::DatasetMethods
- Defined in:
- lib/sequel/model/base.rb
Overview
Dataset methods are methods that the model class extends its dataset with in the call to set_dataset.
Instance Attribute Summary collapse
-
#model ⇒ Object
The model class associated with this dataset.
Instance Method Summary collapse
-
#destroy ⇒ Object
Destroy each row in the dataset by instantiating it and then calling destroy on the resulting model object.
-
#to_hash(key_column = nil, value_column = nil) ⇒ Object
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.
Instance Attribute Details
#model ⇒ Object
The model class associated with this dataset
Artist.dataset.model # => Artist
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# File 'lib/sequel/model/base.rb', line 1413 def model @model end |
Instance Method Details
#destroy ⇒ Object
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)
# ...
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# File 'lib/sequel/model/base.rb', line 1424 def destroy pr = proc{all{|r| r.destroy}.length} model.use_transactions ? @db.transaction(&pr) : pr.call end |
#to_hash(key_column = nil, value_column = nil) ⇒ Object
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, ...}>,
# ...}
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# File 'lib/sequel/model/base.rb', line 1437 def to_hash(key_column=nil, value_column=nil) if key_column super else raise(Sequel::Error, "No primary key for model") unless model and pk = model.primary_key super(pk, value_column) end end |