Class: CassandraModel::DataSet

Inherits:
Object
  • Object
show all
Includes:
TypeGuessing
Defined in:
lib/cassandra_model/data_set.rb

Defined Under Namespace

Classes: ColumnType, TableRotation

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from TypeGuessing

#guess_data_types!

Constructor Details

#initialize ⇒ DataSet

Returns a new instance of DataSet.



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# File 'lib/cassandra_model/data_set.rb', line 7

def initialize
  @columns = Hash.new { |hash, key| hash[key] = :text }
  @data_rotation = {}
  @clustering_columns = []
  @clustering_order = {}
end

Instance Attribute Details

#clustering_order ⇒ Object (readonly)

Returns the value of attribute clustering_order.



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# File 'lib/cassandra_model/data_set.rb', line 5

def clustering_order
  @clustering_order
end

#columns ⇒ Object (readonly)

Returns the value of attribute columns.



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# File 'lib/cassandra_model/data_set.rb', line 5

def columns
  @columns
end

#data_rotation ⇒ Object (readonly)

Returns the value of attribute data_rotation.



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# File 'lib/cassandra_model/data_set.rb', line 5

def data_rotation
  @data_rotation
end

Instance Method Details

#change_type_of(column) ⇒ Object 



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# File 'lib/cassandra_model/data_set.rb', line 41

def change_type_of(column)
  raise "Cannot retype unknown column #{column}" unless columns.include?(column)
  ColumnType.new(column, self)
end

#clustering_columns ⇒ Object 



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# File 'lib/cassandra_model/data_set.rb', line 52

def clustering_columns
  @clustering_columns ||= []
end

#counts(*columns) ⇒ Object 



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# File 'lib/cassandra_model/data_set.rb', line 24

def counts(*columns)
  if columns.empty?
    count_column(:count)
  else
    columns.map { |column| count_column(column) }
  end
end

#is_defined_by(*columns) ⇒ Object 



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# File 'lib/cassandra_model/data_set.rb', line 36

def is_defined_by(*columns)
  knows_about(*columns)
  clustering_columns.concat(columns)
end

#knows_about(*columns) ⇒ Object 



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# File 'lib/cassandra_model/data_set.rb', line 14

def knows_about(*columns)
  columns.each do |column|
    if @guess_data_types
      guess_data_type(column)
    else
      self.columns[column]
    end
  end
end

#rotates_storage_across(slices) ⇒ Object 



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# File 'lib/cassandra_model/data_set.rb', line 32

def rotates_storage_across(slices)
  TableRotation.new(slices, self)
end

#sorts(sorting) ⇒ Object 



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# File 'lib/cassandra_model/data_set.rb', line 46

def sorts(sorting)
  unknown_column = sorting.keys.find { |column, _| !columns.include?(column) }
  raise "Cannot sort unknown column #{unknown_column}" if unknown_column
  clustering_order.merge!(sorting)
end