Class: LcpRuby::Import::AutoMapper

Inherits:
Object
  • Object
show all
Defined in:
lib/lcp_ruby/import/auto_mapper.rb

Overview

Automatically maps source CSV/XLSX column headers to target model field names.

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(source_headers, target_fields) ⇒ AutoMapper

Returns a new instance of AutoMapper.



12
13
14
15
16
 
# File 'lib/lcp_ruby/import/auto_mapper.rb', line 12

def initialize(source_headers, target_fields)
  @source_headers = source_headers
  @target_fields = target_fields
  @used_fields = Set.new
end

Class Method Details

.auto_map(source_headers, target_fields) ⇒ Hash

Returns { “Source Column” => “field_name”, … } for matched columns.

Parameters:

  • source_headers (Array<String>) —

    column headers from the source file

  • target_fields (Array<Hash>) —

    field entries from FieldTreeBuilder (name, label, type)

Returns:

  • (Hash) —

    { “Source Column” => “field_name”, … } for matched columns



8
9
10
 
# File 'lib/lcp_ruby/import/auto_mapper.rb', line 8

def self.auto_map(source_headers, target_fields)
  new(source_headers, target_fields).map
end

Instance Method Details

#map ⇒ Object 



18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
 
# File 'lib/lcp_ruby/import/auto_mapper.rb', line 18

def map
  result = {}

  # Build reverse lookup indexes
  by_name = {}
  by_label = {}

  # Sentinel value to mark suffix collisions between nested fields.
  nested_collision = Object.new

  @target_fields.each do |field|
    name = field["name"].to_s
    label = field["label"].to_s
    by_name[name.downcase] = name
    by_label[label.downcase] = name unless label.empty?

    # Nested fields: also index by suffix so "Starting Salary" can match
    # "hire_detail.starting_salary". Direct fields take priority.
    next unless name.include?(".")

    suffix_key = name.split(".", 2).last.downcase
    if by_name.key?(suffix_key)
      existing = by_name[suffix_key]
      # Another nested field owns it → collision, remove both.
      # Direct field or collision sentinel → leave as is (direct always wins).
      if existing.is_a?(String) && existing.include?(".")
        by_name[suffix_key] = nested_collision
      end
    else
      by_name[suffix_key] = name
    end

    short_label = label.sub(/^.+→\s*/i, "").strip.downcase
    unless short_label.empty?
      if by_label.key?(short_label)
        existing = by_label[short_label]
        if existing.is_a?(String) && existing.include?(".")
          by_label[short_label] = nested_collision
        end
      else
        by_label[short_label] = name
      end
    end
  end

  # Clean up collision sentinels
  by_name.reject! { |_k, v| v.equal?(nested_collision) }
  by_label.reject! { |_k, v| v.equal?(nested_collision) }

  @source_headers.each do |header|
    next if header.nil? || header.strip.empty?
    normalized = header.strip.downcase

    # Strategy 1: exact field name match (case-insensitive)
    if by_name[normalized] && !@used_fields.include?(by_name[normalized])
      result[header] = by_name[normalized]
      @used_fields.add(by_name[normalized])
      next
    end

    # Strategy 2: humanized label match
    if by_label[normalized] && !@used_fields.include?(by_label[normalized])
      result[header] = by_label[normalized]
      @used_fields.add(by_label[normalized])
      next
    end

    # Strategy 3: underscore/humanize normalization
    underscored = normalized.gsub(/\s+/, "_").gsub(/[^a-z0-9_]/, "")
    if by_name[underscored] && !@used_fields.include?(by_name[underscored])
      result[header] = by_name[underscored]
      @used_fields.add(by_name[underscored])
      next
    end
  end

  result
end