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module FileColumnHelpers
class << self
def file_column_fields(klass)
klass.instance_methods.grep(/_just_uploaded\?$/).collect{|m| m[0..-16].to_sym }
end
def generate_delete_helpers(klass)
file_column_fields(klass).each { |field|
klass.send :class_eval, <<-EOF, __FILE__, __LINE__ + 1 unless klass.methods.include?("#{field}_with_delete=")
attr_reader :delete_#{field}
def delete_#{field}=(value)
value = (value=="true") if String===value
return unless value
# passing nil to the file column causes the file to be deleted. Don't delete if we just uploaded a file!
self.#{field} = nil unless self.#{field}_just_uploaded?
end
EOF
}
end
def klass_has_file_column_fields?(klass)
true unless file_column_fields(klass).empty?
end
end
def file_column_fields
@file_column_fields||=FileColumnHelpers.file_column_fields(self)
end
def options_for_file_column_field(field)
self.allocate.send("#{field}_options")
end
def field_has_image_version?(field, version="thumb")
begin
# the only way to get to the options of a particular field is to use the instance method
options = options_for_file_column_field(field)
versions = options[:magick][:versions]
raise unless versions.stringify_keys[version]
true
rescue
false
end
end
def generate_delete_helpers
FileColumnHelpers.generate_delete_helpers(self)
end
end
Version data entries
103 entries across 103 versions & 4 rubygems