Class: Qdsl::ColumnSet

Inherits:
Object
  • Object
show all
Defined in:
lib/column_set.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(columns, block) ⇒ ColumnSet 



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# File 'lib/column_set.rb', line 5

def initialize(columns, block)
  @columns = columns.collect { |x| Column[x] }
  @block = block
end

Instance Attribute Details

#block ⇒ Object (readonly)

Returns the value of attribute block.



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# File 'lib/column_set.rb', line 3

def block
  @block
end

#columns ⇒ Object (readonly)

Returns the value of attribute columns.



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# File 'lib/column_set.rb', line 3

def columns
  @columns
end

Instance Method Details

#capture(source, join_sources) ⇒ Object 



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# File 'lib/column_set.rb', line 10

def capture(source, join_sources)
  sources = [source] + join_sources
  columns = @columns.collect { |x| x.with_source(source) } + if @block
    proxies = sources.collect { |x| ColumnProxy.new(x) }
    [*@block.call(Util::fix_block_params(proxies))]
  else
    []
  end

  undefined_columns = columns.select { |x| !x.exists? }
  raise "One or more undefined columns: #{undefined_columns.collect(&:name).join(', ')}" unless undefined_columns.empty?
  columns
end