Module: Bulldog::Interpolation

Defined in:
lib/bulldog/interpolation.rb

Constant Summary collapse

Error = 
Class.new(Bulldog::Error)

Class Method Summary collapse

Class Method Details

.interpolate(template, record, name, style, overrides = {}) ⇒ Object 



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# File 'lib/bulldog/interpolation.rb', line 5

def self.interpolate(template, record, name, style, overrides={})
  unless overrides[:extension]
    overrides = overrides.dup
    overrides[:extension] ||= style[:format]
    if overrides[:basename]
      overrides[:extension] ||= File.extname(overrides[:basename]).sub(/\A./, '')
    end
  end
  template.gsub(/:(?:(\w+)|\{(\w+?)\})/) do
    key = ($1 || $2).to_sym
    if (override = overrides[key])
      override
    elsif @interpolations.key?(key)
      @interpolations[key].call(record, name, style)
    else
      raise Error, "no such interpolation key: #{key}"
    end
  end
end

.reset ⇒ Object 



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# File 'lib/bulldog/interpolation.rb', line 29

def self.reset
  @interpolations = {}

  to_interpolate :class do |record, name, style|
    record.class.name.underscore.pluralize
  end

  to_interpolate :id do |record, name, style|
    record.send(record.class.primary_key)
  end

  to_interpolate :id_partition do |record, name, style|
    id = record.send(record.class.primary_key)
    ("%09d" % id).scan(/\d{3}/).join("/")
  end

  to_interpolate :attachment do |record, name, style|
    name
  end

  to_interpolate :style do |record, name, style|
    style.name
  end

  to_interpolate :basename do |record, name, style|
    reflection = record.attachment_reflection_for(name)
    column_name = reflection.column_name_for_stored_attribute(:file_name) or
      raise Error, ":basename interpolation requires storing the file name - add a column #{name}_file_name or use store_attributes"
    record.send(column_name)
  end

  to_interpolate :extension do |record, name, style|
    reflection = record.attachment_reflection_for(name)
    column_name = reflection.column_name_for_stored_attribute(:file_name) or
      raise Error, ":extension interpolation requires storing the file name - add a column #{name}_file_name or use store_attributes"
    basename = record.send(column_name) or
      raise Error, ":extension interpolation used when file_name not set - if you need to interpolate the url, pass a :basename override"
    File.extname(basename).sub(/\A\./, '')
  end

  to_interpolate(:root) do
    Bulldog.path_root
  end
end

.to_interpolate(key, &substitution) ⇒ Object 



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# File 'lib/bulldog/interpolation.rb', line 25

def self.to_interpolate(key, &substitution)
  @interpolations[key] = substitution
end