class Daru::IO::Exporters::Base
Base
Exporter Class that contains generic helper methods, to be used by other Exporters
via inheritence
Public Class Methods
new(dataframe)
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Checks whether the first argument given to any `Daru::IO::<Exporter>` module is a `Daru::DataFrame`. Raises an error when it's not a `Daru::DataFrame`.
@param dataframe [Daru::DataFrame] A DataFrame
to initialize
@example Stores the dataframe
df = Daru::DataFrame.new([[1,2],[3,4]], order: [:a, :b]) Daru::IO::Exporters::Base.new(df) #=> #<Daru::IO::Exporters::Base:0x007f899081af08 @dataframe=#<Daru::DataFrame(2x2)> # a b # 0 1 3 # 1 2 4>
@example Raises error when not a DataFrame
Daru::IO::Exporters::Base.new(nil) #=> ArgumentError: Expected first argument to be a Daru::DataFrame, received NilClass instead
# File lib/daru/io/exporters/base.rb, line 27 def initialize(dataframe) unless dataframe.is_a?(Daru::DataFrame) raise ArgumentError, 'Expected first argument to be a Daru::DataFrame, '\ "received #{dataframe.class} instead." end @dataframe = dataframe end
Public Instance Methods
to_s()
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Exports an Exporter instance to a file-writable String.
@return A file-writable `String`
@example Getting a file-writable string from Avro
Exporter instance
instance = Daru::IO::Exporters::Format.new(opts) instance.to_s #! same as df.to_format_string(opts)
# File lib/daru/io/exporters/base.rb, line 44 def to_s tempfile = Tempfile.new('tempfile') path = tempfile.path write(path) File.read(path) end