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require 'clevic/delegates/combo_delegate'
require 'clevic/dataset_roller.rb'
module Clevic
# Display a collection of possible related entities in the combo box.
# TODO this should be a module
class RelationalDelegate
def needs_combo?
dataset.count > 0
end
def empty_set_message
"There must be records in #{field.related_class} for this field to be editable."
end
def population
# dataset contains the set of all possible related entities,
# dataset is defined in Delegate
# entity is set in init_component
# field and entity are used by FieldValuer
# including the current entity.
# Could also use
# dataset.or( entity_class.primary_key => entity_key.pk )
# but that would put current entity in the list somewhere
# other than the top, which seems to be the most sensible
# place for it. Could also create a special enumerator
# which gives back the entity first, followed by the dataset.
dataset.all.with do |values|
# make sure there's only one instance of the current value,
# and make sure it's at the top of the list
values.delete( attribute_value )
values.unshift( attribute_value )
end
end
# don't allow new values
def restricted?; true; end
protected
# Return an instance of the ORM dataset,
# right now that's Sequel::Dataset.
# This exists because convincing this functionality to
# coexist in the same method as dataset would be tricky.
def dataset
unless field.find_options.empty?
require 'clevic/ar_methods'
field.related_class.plugin :ar_methods
field.related_class.translate( field.find_options )
else
field.dataset_roller.dataset
end
end
end
end
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10 entries across 10 versions & 1 rubygems