Class: ReportingEntry

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

Overview

This class represents a single reporting entry. Casting for numerical values and a ‘+’ for the addition of different object is included.

Constant Summary collapse

SUMMABLE_INT_FIELDS_REGEXP =

These constants define fields which are casted to integers/float in the accessor. Also these fields are added when adding two SuperReportingEntries.

DON’T USE THIS FOR IDs (e.g. ad_id)

/OVERWRITE_THIS_IN_SUBCLASS/
SUMMABLE_FLOAT_FIELDS_REGEXP = 
/OVERWRITE_THIS_IN_SUBCLASS/
NOT_SUMMABLE_FIELDS =

Columns listed in this array are explicitely not summable

%w(

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(attributes = {}) ⇒ ReportingEntry

Standard constructor takes attributes as hash (like OpenStruct)



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# File 'lib/reporting/reporting_entry.rb', line 21

def initialize(attributes = {})
  @attributes = HashWithIndifferentAccess.new(attributes)
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(method_id, *args) ⇒ Object

Offers an OpenStruct like access to the values stored in @attributes Uses the information from SUMMABLE_*_FIELDS_REGEXP to cast to numerical values.



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# File 'lib/reporting/reporting_entry.rb', line 28

def method_missing(method_id, *args)
  return self.send("lazy_#{method_id}", *args) if self.respond_to?("lazy_#{method_id}")
  if @attributes.has_key?(method_id) || method_id.to_s =~ summable_fields_regexp
    return cast(method_id, @attributes[method_id])
  end
  super(method_id, *args)
end

Instance Attribute Details

#attributes ⇒ Object (readonly)

The raw attributes hash



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# File 'lib/reporting/reporting_entry.rb', line 6

def attributes
  @attributes
end

Class Method Details

.composite(entries) ⇒ Object

Returns a composite element which lazily sums up the summable values of the children



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# File 'lib/reporting/reporting_entry.rb', line 70

def self.composite(entries)
  public_methods         = self.instance_methods - Object.public_methods
  summable_methods       = public_methods.select { |method| method.to_s =~ summable_fields_regexp }

  klass = Class.new(self) do
    define_method(:method_missing) do |method_id, *args|
      if (method_id.to_s =~ summable_fields_regexp)
        return entries.inject(0) do |sum, entry|
          sum + entry.send(method_id, *args)
        end
      else
        return entries.first.send(method_id, *args)
      end
    end

    # Delegate all summable method calls to the children
    # by using the method_missing method
    summable_methods.each do |method_id|
      define_method(method_id) do |*args|
        self.method_missing(method_id, *args)
      end
    end
    
    # For better debuggability
    #
    define_method :inspect do
      "CompositeReportingEntry [entries: #{entries.inspect} ]"
    end
  end
  klass.new
end

Instance Method Details

#+(other) ⇒ Object

Add another SuperReportingEntry and returns the resulting entry. All attributes specified by SUMMABLE_FIELD_REGEXP are summed up. Further attributes are merged (the own values has priority).



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# File 'lib/reporting/reporting_entry.rb', line 39

def +(other)
  return self.class.composite([self, other])
end

#is_sum_entry? ⇒ Boolean

Returns true if entry is a sum entry (like returned by to_sum_entry)

Returns:

  • (Boolean) 


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# File 'lib/reporting/reporting_entry.rb', line 103

def is_sum_entry?
  return false
end

#to_sum_entry ⇒ Object

Returns a ReportingEntry object with all non addable values set to nil This is thought be used for sum(mary) rows



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# File 'lib/reporting/reporting_entry.rb', line 45

def to_sum_entry
  subject = self
  klass = Class.new(self.class) do
    # overwrite explicitely not summable columns
    #
    subject.send(:not_summable_fields).each do |method_id|
      define_method(method_id) { nil }
    end
    
    # method missing decides if the columns is displayed or not
    #
    define_method(:method_missing) do |method_id, *args|
      (method_id.to_s =~ summable_fields_regexp) ? subject.send(method_id, *args) : nil
    end

    # yes, this actually is a sum entry ;-)
    #
    def is_sum_entry?
      return true
    end
  end
  klass.new
end