class Tempo::Model::Base

Attributes

id[R]

Public Class Methods

delete(instance) click to toggle source
# File lib/tempo/models/base.rb, line 146
def delete(instance)
  id = instance.id
  index.delete( instance )
  ids.delete( id )
end
file() click to toggle source

example: Tempo::Model::Animal -> tempo_animals.yaml

# File lib/tempo/models/base.rb, line 40
def file
  FileRecord::FileUtility.new(self).filename
end
find(key, value) click to toggle source

example: Tempo::Model.find(“id”, 1)

# File lib/tempo/models/base.rb, line 126
def find(key, value)
  key = "@#{key}".to_sym
  matches = []
  index.each do |i|
    stored_value = i.instance_variable_get( key )

    if stored_value.kind_of? String
      if value.kind_of? Regexp
        matches << i if value.match stored_value
      else
        matches << i if stored_value.downcase.include? value.to_s.downcase
      end

    elsif stored_value.kind_of? Integer
      matches << i if stored_value == value.to_i
    end
  end
  matches
end
find_by_id(id) click to toggle source

find by id should be exact, so we remove the array wrapper

# File lib/tempo/models/base.rb, line 119
def find_by_id(id)
  matches = find "id", id
  match = matches[0]
end
id_counter() click to toggle source

Maintain an array of unique ids for the class. Initialize new members with the next numberical id Ids can be assigned on init (for the purpose of reading in records of previous instances). An error will be raised if there is already an instance with that id.

# File lib/tempo/models/base.rb, line 27
def id_counter
  @id_counter ||= 1
end
ids() click to toggle source
# File lib/tempo/models/base.rb, line 31
def ids
  @ids ||= []
end
index() click to toggle source
# File lib/tempo/models/base.rb, line 35
def index
  @index ||= []
end
instances_have_attributes?(attrs) click to toggle source
# File lib/tempo/models/base.rb, line 84
def instances_have_attributes?(attrs)
    finder_attrs = attrs.map { |key| "@#{key}".to_sym }
    model_attrs = index.map { |i| i.instance_variables }.flatten.uniq

    # Make sure all attributes are present in index objects
    (model_attrs & finder_attrs).size == finder_attrs.size
end
method_missing(meth, *args, &block) click to toggle source
Calls superclass method
# File lib/tempo/models/base.rb, line 54
def method_missing(meth, *args, &block)
  if respond_to? meth
    if meth.to_s =~ /^find_by_(.+)$/
      self.class.send(:define_method, meth) do |*args|
        run_find_by_method($1, *args)
      end
      self.send(meth, *args)

    elsif meth.to_s =~ /^sort_by_(.+)$/
      self.class.send(:define_method, meth) do |*args, &block|
        run_sort_by_method($1, *args, &block)
      end
      self.send(meth, *args, &block)

    else
      super
    end
  else
    super
  end
end
new(options={}) click to toggle source
# File lib/tempo/models/base.rb, line 153
def initialize(options={})
  id_candidate = options[:id]
  if !id_candidate
    @id = self.class.next_id
  elsif self.class.ids.include? id_candidate
    raise IdentityConflictError, "Id #{id_candidate} already exists"
  else
    @id = id_candidate
  end
  self.class.add_id @id
  self.class.add_to_index self
end
read_from_file(options={}) click to toggle source

pass custom directory through in options

# File lib/tempo/models/base.rb, line 50
def read_from_file(options={})
  FileRecord::Record.read_model self, options
end
respond_to?(method_id, include_private = false) click to toggle source
Calls superclass method
# File lib/tempo/models/base.rb, line 76
def respond_to?(method_id, include_private = false)
  if method_id.to_s =~ /^find_by_(.+)$/ || method_id.to_s =~ /^sort_by_(.+)$/
    instances_have_attributes? $1.split('_and_')
  else
    super
  end
end
run_find_by_method(attrs, *args) click to toggle source
# File lib/tempo/models/base.rb, line 99
def run_find_by_method(attrs, *args)
  # Make an array of attribute names
  attrs = attrs.split('_and_')

  attrs_with_args = [attrs, args].transpose

  filtered = index.clone
  attrs_with_args.each do | kv |
    matches = find kv[0], kv[1]

    return matches if matches.empty?
    matches.each do |match|
      matches.delete match unless filtered.include? match
      filtered = matches
    end
  end
  filtered
end
run_sort_by_method(attribute, args=@index.clone, &block) click to toggle source
# File lib/tempo/models/base.rb, line 92
def run_sort_by_method(attribute, args=@index.clone, &block)
  attr = "@#{attribute}".to_sym
  args.sort! { |a,b| a.instance_variable_get( attr ) <=> b.instance_variable_get( attr ) }
  return args unless block
  block.call args
end
save_to_file(options={}) click to toggle source

pass custom directory through in options

# File lib/tempo/models/base.rb, line 45
def save_to_file(options={})
  FileRecord::Record.save_model self, options
end

Protected Class Methods

add_id(id) click to toggle source
# File lib/tempo/models/base.rb, line 190
def self.add_id(id)
  @ids ||=[]
  @ids << id
  @ids.sort!
end
add_to_index(member) click to toggle source
# File lib/tempo/models/base.rb, line 184
def self.add_to_index(member)
  @index ||= []
  @index << member
  @index.sort! { |a,b| a.id <=> b.id }
end
increase_id_counter() click to toggle source
# File lib/tempo/models/base.rb, line 196
def self.increase_id_counter
  @id_counter ||= 0
  @id_counter = @id_counter.next
end
next_id() click to toggle source
# File lib/tempo/models/base.rb, line 201
def self.next_id
  while ids.include? id_counter
    increase_id_counter
  end
  id_counter
end

Public Instance Methods

delete() click to toggle source
# File lib/tempo/models/base.rb, line 178
def delete
  self.class.delete self
end
freeze_dry() click to toggle source

record the state of all instance variables as a hash

# File lib/tempo/models/base.rb, line 167
def freeze_dry
  record = {}
  state = instance_variables
  state.each do |attr|
    key = attr[1..-1].to_sym
    val = instance_variable_get attr
    record[key] = val
  end
  record
end