Class: Classifieds::Item

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

Overview

describes the thing in a listing that is for sale

Direct Known Subclasses

Vehicle

Constant Summary collapse

COLUMN_SEPARATION = 
5

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(title, price, condition, detail_url) ⇒ Item

It is expected to be subclassed based on the type of item for sale (e.g., vehicle, clothing, furniture, etc.) To improve response time, an item’s detail_values are only loaded on demand (from the detail url)



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# File 'lib/classifieds/item.rb', line 5

def initialize(title, price, condition, detail_url)
  @title = title
  @price = price
  @detail_url = detail_url
  @condition = condition
  @detail_values = {}
end

Class Method Details

.clear ⇒ Object

Empty list of created objects



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# File 'lib/classifieds/item.rb', line 14

def self.clear
  # all.clear  # not used, for now.
end

Instance Method Details

#details_to_string(addon_details) ⇒ Object

Return an item’s detail data formatted for display



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# File 'lib/classifieds/item.rb', line 21

def details_to_string(addon_details)
  Classifieds::Listing.scrape_listing_details(self.class, @detail_url, @condition, @detail_values) if @detail_values.empty?

  # Setup attribute/value details array
  detail_values_array = @detail_values.to_a
  addon_details.delete(:Phone) if detail_phone?  # do not addon phone if item details has a phone.
  detail_values_array.concat(addon_details.to_a)
  col2_offset = ((detail_values_array.size-1) / 2) + ((detail_values_array.size-1) % 2) # remove 1 from array size for description. It will get its own row.

  col_attr_width = []
  col_width = []

  # Calculate column 1 widths
  widths = max_col_widths(detail_values_array, 0, col2_offset)  # [max_attr_width, max_val_width, max_column_width]
  col_attr_width[0] = widths[0]
  col_width[0] = [widths[2], Classifieds::Item.col_width_limit(1)].min  # limit col width to max col width
  col_width[0] += COLUMN_SEPARATION

  # Calculate column 2 widths
  widths = max_col_widths(detail_values_array, col2_offset+1, detail_values_array.size)  # [max_attr_width, max_val_width, max_column_width]
  col_attr_width[1] = widths[0]
  col_width[1] = [widths[2], Classifieds::Item.col_width_limit(2)].min  # limit col width to max col width

  # Description value spans all columns.
  attribute = detail_values_array[0][0].to_s
  value = detail_values_array[0][1]
  result = "  #{Classifieds::Listing.format_detail(attribute, col_attr_width[0], value)}\n"

  # Then display remaining details in two column format.
  (1..col2_offset).each { |index|
    result << "  #{Classifieds::Item.format_pair(detail_values_array, index,             col_attr_width[0], col_width[0])}"
    next if (index+col2_offset) == detail_values_array.size  # when odd number of details.
    result << "  #{Classifieds::Item.format_pair(detail_values_array, index+col2_offset, col_attr_width[1], col_width[1])}\n"
  }
  result
end