Class: DohDb::WritableRow

Inherits:
AbstractRow show all
Defined in:
lib/dohmysql/writable_row.rb

Instance Attribute Summary collapse

Attributes inherited from AbstractRow

#keys, #values

Instance Method Summary collapse

Methods inherited from AbstractRow

#at, #each_pair, #empty_field?, #get, #inspect, #key?, #size, #to_a, #to_h

Constructor Details

#initialize(*args) ⇒ WritableRow

can accept 2 arguments: keys array, values array or 1 argument: a hash



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# File 'lib/dohmysql/writable_row.rb', line 12

def initialize(*args)
  keys, values = parse_initialize_args(*args)
  @keys = keys.dup
  @values = values.dup
  @changed_keys = Set.new
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(sym, *args) ⇒ Object

Raises:

  • (RuntimeError) 


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# File 'lib/dohmysql/writable_row.rb', line 41

def method_missing(sym, *args)
  name = sym.to_s
  if name.lastn(1) == '='
    key = name[0..-2]
    assign = true
  else
    key = name
  end
  raise RuntimeError.new("unknown field: " + name) unless key?(key)

  if assign
    set(key, args.first)
  else
    get(key)
  end
end

Instance Attribute Details

#changed_keys ⇒ Object (readonly)

Returns the value of attribute changed_keys.



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# File 'lib/dohmysql/writable_row.rb', line 8

def changed_keys
  @changed_keys
end

Instance Method Details

#clear_changed_keys ⇒ Object 



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# File 'lib/dohmysql/writable_row.rb', line 37

def clear_changed_keys
  @changed_keys.clear
end

#initialize_copy(orig) ⇒ Object 



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# File 'lib/dohmysql/writable_row.rb', line 19

def initialize_copy(orig)
  super(orig)
  @changed_keys = Set.new
end

#set(key, value) ⇒ Object Also known as: []= 



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# File 'lib/dohmysql/writable_row.rb', line 24

def set(key, value)
  index = @keys.index(key)
  if index
    @values[index] = value
  else
    @keys.push(key)
    @values.push(value)
  end
  @changed_keys.add(key)
  value
end