Class: Chef::Expander::Flattener

Inherits:
Object
  • Object
show all
Defined in:
lib/chef/expander/flattener.rb

Overview

Flattens and expands nested Hashes representing Chef objects (e.g, Nodes, Roles, DataBagItems, etc.) into flat Hashes so the objects are suitable to be saved into Solr. This code is more or less copy-pasted from chef/solr/index which may or may not be a great idea, though that does minimize the dependencies and hopefully minimize the memory use of chef-expander.

Constant Summary collapse

UNDERSCORE = 
'_'
X = 
'X'
X_CHEF_id_CHEF_X = 
'X_CHEF_id_CHEF_X'
X_CHEF_database_CHEF_X = 
'X_CHEF_database_CHEF_X'
X_CHEF_type_CHEF_X = 
'X_CHEF_type_CHEF_X'

Instance Method Summary collapse

Constructor Details

#initialize(item) ⇒ Flattener

Returns a new instance of Flattener.



39
40
41
 
# File 'lib/chef/expander/flattener.rb', line 39

def initialize(item)
  @item = item
end

Instance Method Details

#add_field_value(keys, value) ⇒ Object 



72
73
74
75
76
 
# File 'lib/chef/expander/flattener.rb', line 72

def add_field_value(keys, value)
  value = value.to_s
  @flattened_item[keys.join(UNDERSCORE)] << value
  @flattened_item[keys.last] << value
end

#flatten_and_expand ⇒ Object 



47
48
49
50
51
52
53
54
55
56
 
# File 'lib/chef/expander/flattener.rb', line 47

def flatten_and_expand
  @flattened_item = Hash.new {|hash, key| hash[key] = []}

  @item.each do |key, value|
    flatten_each([key.to_s], value)
  end

  @flattened_item.each_value { |values| values.uniq! }
  @flattened_item
end

#flatten_each(keys, values) ⇒ Object 



58
59
60
61
62
63
64
65
66
67
68
69
70
 
# File 'lib/chef/expander/flattener.rb', line 58

def flatten_each(keys, values)
  case values
  when Hash
    values.each do |child_key, child_value|
      add_field_value(keys, child_key)
      flatten_each(keys + [child_key.to_s], child_value)
    end
  when Array
    values.each { |child_value| flatten_each(keys, child_value) }
  else
    add_field_value(keys, values)
  end
end

#flattened_item ⇒ Object 



43
44
45
 
# File 'lib/chef/expander/flattener.rb', line 43

def flattened_item
  @flattened_item || flatten_and_expand
end