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Class: CSV::Row

Relationships & Source Files
Super Chains via Extension / Inclusion / Inheritance
Class Chain:
self, Forwardable
Instance Chain:
self, Enumerable
Inherits: Object
Defined in: lib/csv/row.rb

Overview

A CSV::Row instance represents a CSV table row. (see class CSV).

The instance may have:

  • Fields: each is an object, not necessarily a String.

  • Headers: each serves a key, and also need not be a String.

Instance Methods

CSV::Row has three groups of instance methods:

  • Its own internally defined instance methods.

  • Methods included by module Enumerable.

  • Methods delegated to class ::Array.:

    • Array#empty?

    • Array#length

    • Array#size

Creating a CSV::Row Instance

Commonly, a new CSV::Row instance is created by parsing CSV source that has headers:

source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
table = CSV.parse(source, headers: true)
table.each {|row| p row }

Output:

#<CSV::Row "Name":"foo" "Value":"0">
#<CSV::Row "Name":"bar" "Value":"1">
#<CSV::Row "Name":"baz" "Value":"2">

You can also create a row directly. See .new.

Headers

Like a CSV::Table, a CSV::Row has headers.

A CSV::Row that was created by parsing CSV source inherits its headers from the table:

source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
table = CSV.parse(source, headers: true)
row = table.first
row.headers # => ["Name", "Value"]

You can also create a new row with headers; like the keys in a Hash, the headers need not be Strings:

row = CSV::Row.new([:name, :value], ['foo', 0])
row.headers # => [:name, :value]

The new row retains its headers even if added to a table that has headers:

table << row # => #<CSV::Table mode:col_or_row row_count:5>
row.headers # => [:name, :value]
row[:name] # => "foo"
row['Name'] # => nil

Accessing Fields

You may access a field in a CSV::Row with either its Integer index (Array-style) or its header (Hash-style).

Fetch a field using method #[]:

row = CSV::Row.new(['Name', 'Value'], ['foo', 0])
row[1] # => 0
row['Value'] # => 0

Set a field using method #[]=:

row = CSV::Row.new(['Name', 'Value'], ['foo', 0])
row # => #<CSV::Row "Name":"foo" "Value":0>
row[0] = 'bar'
row['Value'] = 1
row # => #<CSV::Row "Name":"bar" "Value":1>

Class Method Summary

Instance Attribute Summary

Instance Method Summary

Constructor Details

.new(headers, fields, header_row = false) ⇒ Row

Returns the new CSV::Row instance constructed from arguments #headers and #fields; both should be Arrays; note that the fields need not be Strings:

row = CSV::Row.new(['Name', 'Value'], ['foo', 0])
row # => #<CSV::Row "Name":"foo" "Value":0>

If the Array lengths are different, the shorter is nil-filled:

row = CSV::Row.new(['Name', 'Value', 'Date', 'Size'], ['foo', 0])
row # => #<CSV::Row "Name":"foo" "Value":0 "Date":nil "Size":nil>

Each CSV::Row object is either a field row or a header row; by default, a new row is a field row; for the row created above:

row.field_row? # => true
row.header_row? # => false

If the optional argument header_row is given as true, the created row is a header row:

row = CSV::Row.new(['Name', 'Value'], ['foo', 0], header_row = true)
row # => #<CSV::Row "Name":"foo" "Value":0>
row.field_row? # => false
row.header_row? # => true
[ GitHub ] 

  


# File 'lib/csv/row.rb', line 105



def initialize(headers, fields, header_row = false)
  @header_row = header_row
  headers.each { |h| h.freeze if h.is_a? String }

  # handle extra headers or fields
  @row = if headers.size >= fields.size
    headers.zip(fields)
  else
    fields.zip(headers).each(&:reverse!)
  end
end


  







Instance Attribute Details



  

    #field_row?  ⇒ Boolean  (readonly)  



  

    

Returns true if this is a field row, false otherwise.


  



  [ GitHub ]


  

  


# File 'lib/csv/row.rb', line 148



def field_row?
  not header_row?
end


  








  

    #header_row?  ⇒ Boolean  (readonly)  



  

    

Returns true if this is a header row, false otherwise.


  



  [ GitHub ]


  

  


# File 'lib/csv/row.rb', line 140



def header_row?
  @header_row
end


  








  

    #row   (readonly, protected)
  



  

    

Internal data format used to compare equality.


  



  [ GitHub ]


  

  


# File 'lib/csv/row.rb', line 118



attr_reader :row


  







Instance Method Details



  

    

      #row(<< [header, value])  ⇒ self 
      #<<(hash)  ⇒ self 
      #<<(value)  ⇒ self 
    

  



  

    

Adds a field to self; returns self:



If the argument is a 2-element Array [header, value], a field is added with the given header and value:



source = "Name,Name,Name\nFoo,Bar,Baz\n"
table = CSV.parse(source, headers: true)
row = table[0]
row << ['NAME', 'Bat']
row # => #<CSV::Row "Name":"Foo" "Name":"Bar" "Name":"Baz" "NAME":"Bat">



If the argument is a Hash, each key-value pair is added as a field with header key and value value.



source = "Name,Name,Name\nFoo,Bar,Baz\n"
table = CSV.parse(source, headers: true)
row = table[0]
row << {NAME: 'Bat', name: 'Bam'}
row # => #<CSV::Row "Name":"Foo" "Name":"Bar" "Name":"Baz" NAME:"Bat" name:"Bam">



Otherwise, the given value is added as a field with no header.



source = "Name,Name,Name\nFoo,Bar,Baz\n"
table = CSV.parse(source, headers: true)
row = table[0]
row << 'Bag'
row # => #<CSV::Row "Name":"Foo" "Name":"Bar" "Name":"Baz" nil:"Bag">


  





  


  [ GitHub ]


  

  


# File 'lib/csv/row.rb', line 389



def <<(arg)
  if arg.is_a?(Array) and arg.size == 2  # appending a header and name
    @row << arg
  elsif arg.is_a?(Hash)                  # append header and name pairs
    arg.each { |pair| @row << pair }
  else                                   # append field value
    @row << [nil, arg]
  end

  self  # for chaining
end


  








  

    #==(other)  ⇒ Boolean   



  

    

Returns true if other is a /CSV::Row that has the same fields (headers and values) in the same order as self; otherwise returns false:



source = "Name,Name,Name\nFoo,Bar,Baz\n"
table = CSV.parse(source, headers: true)
row = table[0]
other_row = table[0]
row == other_row # => true
other_row = table[1]
row == other_row # => false


  



  [ GitHub ]


  

  


# File 'lib/csv/row.rb', line 633



def ==(other)
  return @row == other.row if other.is_a? CSV::Row
  @row == other
end


  








  

    #[](header_or_index, minimum_index = 0)  
  



  

    

Alias for #field.


  



  [ GitHub ]


  

  


# File 'lib/csv/row.rb', line 215



alias_method :[], :field


  








  

    

      #[]=(index, value)  ⇒ value 
      #[]=(header, offset, value)  ⇒ value 
      #[]=(header, value)  ⇒ value 
    

  



  

    

Assigns the field value for the given #index or header; returns value.





Assign field value by Integer index:



source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
table = CSV.parse(source, headers: true)
row = table[0]
row[0] = 'Bat'
row[1] = 3
row # => #<CSV::Row "Name":"Bat" "Value":3>



Counts backward from the last column if #index is negative:



row[-1] = 4
row[-2] = 'Bam'
row # => #<CSV::Row "Name":"Bam" "Value":4>



Extends the row with nil:nil if positive #index is not in the row:



row[4] = 5
row # => #<CSV::Row "Name":"bad" "Value":4 nil:nil nil:nil nil:5>



Raises IndexError if negative #index is too small (too far from zero).





Assign field value by header (first found):



source = "Name,Name,Name\nFoo,Bar,Baz\n"
table = CSV.parse(source, headers: true)
row = table[0]
row['Name'] = 'Bat'
row # => #<CSV::Row "Name":"Bat" "Name":"Bar" "Name":"Baz">



Assign field value by header, ignoring offset leading fields:



source = "Name,Name,Name\nFoo,Bar,Baz\n"
table = CSV.parse(source, headers: true)
row = table[0]
row['Name', 2] = 4
row # => #<CSV::Row "Name":"Foo" "Name":"Bar" "Name":4>



Append new field by (new) header:



source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
table = CSV.parse(source, headers: true)
row = table[0]
row['New'] = 6
row# => #<CSV::Row "Name":"foo" "Value":"0" "New":6>


  





  


  [ GitHub ]


  

  


# File 'lib/csv/row.rb', line 339



def []=(*args)
  value = args.pop

  if args.first.is_a? Integer
    if @row[args.first].nil?  # extending past the end with index
      @row[args.first] = [nil, value]
      @row.map! { |pair| pair.nil? ? [nil, nil] : pair }
    else                      # normal index assignment
      @row[args.first][1] = value
    end
  else
    index = index(*args)
    if index.nil?             # appending a field
      self << [args.first, value]
    else                      # normal header assignment
      @row[index][1] = value
    end
  end
end


  








  

    #deconstruct  ⇒ Array   



  

    

Returns the new Array suitable for pattern matching containing the values of the row.


  



  [ GitHub ]


  

  


# File 'lib/csv/row.rb', line 682



def deconstruct
  fields
end


  








  

    #deconstruct_keys(keys)  ⇒ Hash   



  

    

Returns the new Hash suitable for pattern matching containing only the keys specified as an argument.


  



  [ GitHub ]


  

  


# File 'lib/csv/row.rb', line 667



def deconstruct_keys(keys)
  if keys.nil?
    to_h
  else
    keys.to_h { |key| [key, self[key]] }
  end
end


  








  

    

      #delete(index)  ⇒ Array, value 
      #delete(header)  ⇒ Array, value 
      #delete(header, offset)  ⇒ Array, value 
    

  



  

    

Removes a specified field from self; returns the 2-element Array [header, value] if the field exists.



If an Integer argument #index is given, removes and returns the field at offset #index, or returns nil if the field does not exist:



source = "Name,Name,Name\nFoo,Bar,Baz\n"
table = CSV.parse(source, headers: true)
row = table[0]
row.delete(1) # => ["Name", "Bar"]
row.delete(50) # => nil



Otherwise, if the single argument header is given, removes and returns the first-found field with the given header, of returns a new empty Array if the field does not exist:



source = "Name,Name,Name\nFoo,Bar,Baz\n"
table = CSV.parse(source, headers: true)
row = table[0]
row.delete('Name') # => ["Name", "Foo"]
row.delete('NAME') # => []



If argument header and Integer argument offset are given, removes and returns the first-found field with the given header whose #index is at least as large as offset:



source = "Name,Name,Name\nFoo,Bar,Baz\n"
table = CSV.parse(source, headers: true)
row = table[0]
row.delete('Name', 1) # => ["Name", "Bar"]
row.delete('NAME', 1) # => []


  





  


  [ GitHub ]


  

  


# File 'lib/csv/row.rb', line 451



def delete(header_or_index, minimum_index = 0)
  if header_or_index.is_a? Integer                 # by index
    @row.delete_at(header_or_index)
  elsif i = index(header_or_index, minimum_index)  # by header
    @row.delete_at(i)
  else
    [ ]
  end
end


  








  

    #delete_if {|header, value| ... } ⇒ self   



  

    

Removes fields from self as selected by the block; returns self.



Removes each field for which the block returns a truthy value:



source = "Name,Name,Name\nFoo,Bar,Baz\n"
table = CSV.parse(source, headers: true)
row = table[0]
row.delete_if {|header, value| value.start_with?('B') } # => true
row # => #<CSV::Row "Name":"Foo">
row.delete_if {|header, value| header.start_with?('B') } # => false



If no block is given, returns a new Enumerator:



row.delete_if # => #<Enumerator: #<CSV::Row "Name":"Foo">:delete_if>


  



  [ GitHub ]


  

  


# File 'lib/csv/row.rb', line 476



def delete_if(&block)
  return enum_for(__method__) { size } unless block_given?

  @row.delete_if(&block)

  self  # for chaining
end


  








  

    #dig(index_or_header, *identifiers)  ⇒ Object   



  

    

Finds and returns the object in nested object that is specified by index_or_header and specifiers.



The nested objects may be instances of various classes. See Dig Methods.



Examples:



source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
table = CSV.parse(source, headers: true)
row = table[0]
row.dig(1) # => "0"
row.dig('Value') # => "0"
row.dig(5) # => nil


  



  [ GitHub ]


  

  


# File 'lib/csv/row.rb', line 715



def dig(index_or_header, *indexes)
  value = field(index_or_header)
  if value.nil?
    nil
  elsif indexes.empty?
    value
  else
    unless value.respond_to?(:dig)
      raise TypeError, "#{value.class} does not have \#dig method"
    end
    value.dig(*indexes)
  end
end


  








  

    #each {|header, value| ... } ⇒ self     Also known as: #each_pair
  



  

    

Calls the block with each header-value pair; returns self:



source = "Name,Name,Name\nFoo,Bar,Baz\n"
table = CSV.parse(source, headers: true)
row = table[0]
row.each {|header, value| p [header, value] }



Output:



["Name", "Foo"]
["Name", "Bar"]
["Name", "Baz"]



If no block is given, returns a new Enumerator:



row.each # => #<Enumerator: #<CSV::Row "Name":"Foo" "Name":"Bar" "Name":"Baz">:each>


  



  [ GitHub ]


  

  


# File 'lib/csv/row.rb', line 610



def each(&block)
  return enum_for(__method__) { size } unless block_given?

  @row.each(&block)

  self  # for chaining
end


  








  

    #each_pair(&block)  
  



  

    

Alias for #each.


  



  [ GitHub ]


  

  


# File 'lib/csv/row.rb', line 618



alias_method :each_pair, :each


  








  

    

      #fetch(header)  ⇒ value 
      #fetch(header, default)  ⇒ value 
      #fetch(header) {|row| ... } ⇒ value 
    

  



  

    

Returns the field value as specified by header.





With the single argument header, returns the field value for that header (first found):



source = "Name,Name,Name\nFoo,Bar,Baz\n"
table = CSV.parse(source, headers: true)
row = table[0]
row.fetch('Name') # => "Foo"



Raises exception KeyError if the header does not exist.





With arguments header and default given, returns the field value for the header (first found) if the header exists, otherwise returns default:



source = "Name,Name,Name\nFoo,Bar,Baz\n"
table = CSV.parse(source, headers: true)
row = table[0]
row.fetch('Name', '') # => "Foo"
row.fetch(:nosuch, '') # => ""





With argument header and a block given, returns the field value for the header (first found) if the header exists; otherwise calls the block and returns its return value:



source = "Name,Name,Name\nFoo,Bar,Baz\n"
table = CSV.parse(source, headers: true)
row = table[0]
row.fetch('Name') {|header| fail 'Cannot happen' } # => "Foo"
row.fetch(:nosuch) {|header| "Header '#{header} not found'" } # => "Header 'nosuch not found'"


  





  
Raises:


    
  
  • 
    (ArgumentError)
  
    • 





  [ GitHub ]


  

  


# File 'lib/csv/row.rb', line 258



def fetch(header, *varargs)
  raise ArgumentError, "Too many arguments" if varargs.length > 1
  pair = @row.assoc(header)
  if pair
    pair.last
  else
    if block_given?
      yield header
    elsif varargs.empty?
      raise KeyError, "key not found: #{header}"
    else
      varargs.first
    end
  end
end


  








  

    

      #field(index)  ⇒ value 
      #field(header)  ⇒ value 
      #field(header, offset)  ⇒ value 
    

    Also known as: #[]
  



  

    

Returns the field value for the given #index or header.





Fetch field value by Integer index:



source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
table = CSV.parse(source, headers: true)
row = table[0]
row.field(0) # => "foo"
row.field(1) # => "bar"



Counts backward from the last column if #index is negative:



row.field(-1) # => "0"
row.field(-2) # => "foo"



Returns nil if #index is out of range:



row.field(2) # => nil
row.field(-3) # => nil





Fetch field value by header (first found):



source = "Name,Name,Name\nFoo,Bar,Baz\n"
table = CSV.parse(source, headers: true)
row = table[0]
row.field('Name') # => "Foo"



Fetch field value by header, ignoring offset leading fields:



source = "Name,Name,Name\nFoo,Bar,Baz\n"
table = CSV.parse(source, headers: true)
row = table[0]
row.field('Name', 2) # => "Baz"



Returns nil if the header does not exist.


  





  


  [ GitHub ]


  

  


# File 'lib/csv/row.rb', line 203



def field(header_or_index, minimum_index = 0)
  # locate the pair
  finder = (header_or_index.is_a?(Integer) || header_or_index.is_a?(Range)) ? :[] : :assoc
  pair   = @row[minimum_index..-1].public_send(finder, header_or_index)

  # return the field if we have a pair
  if pair.nil?
    nil
  else
    header_or_index.is_a?(Range) ? pair.map(&:last) : pair.last
  end
end


  








  

    #field?(value)  ⇒ Boolean   



  

    

Returns true if value is a field in this row, false otherwise:



source = "Name,Name,Name\nFoo,Bar,Baz\n"
table = CSV.parse(source, headers: true)
row = table[0]
row.field?('Bar') # => true
row.field?('BAR') # => false


  



  [ GitHub ]


  

  


# File 'lib/csv/row.rb', line 589



def field?(data)
  fields.include? data
end


  








  

    #fields(*specifiers)  ⇒ array_of_fields     Also known as: #values_at
  



  

    

Returns field values per the given specifiers, which may be any mixture of:


  • 

    Integer index.
    

  • 

    Range of Integer indexes.
    

  • 

    2-element Array containing a header and offset.
    

  • 

    Header.
    

  • 

    Range of headers.
    




For specifier in one of the first four cases above, returns the result of self.field(specifier);  see #field.



Although there may be any number of specifiers, the examples here will illustrate one at a time.



When the specifier is an Integer #index, returns self.field(index)L



source = "Name,Name,Name\nFoo,Bar,Baz\n"
table = CSV.parse(source, headers: true)
row = table[0]
row.fields(1) # => ["Bar"]



When the specifier is a Range of Integers range, returns self.field(range):



row.fields(1..2) # => ["Bar", "Baz"]



When the specifier is a 2-element Array array, returns self.field(array)L



row.fields('Name', 1) # => ["Foo", "Bar"]



When the specifier is a header header, returns self.field(header)L



row.fields('Name') # => ["Foo"]



When the specifier is a Range of headers range, forms a new Range new_range from the indexes of range.start and range.end, and returns self.field(new_range):



source = "Name,NAME,name\nFoo,Bar,Baz\n"
table = CSV.parse(source, headers: true)
row = table[0]
row.fields('Name'..'NAME') # => ["Foo", "Bar"]



Returns all fields if no argument given:



row.fields # => ["Foo", "Bar", "Baz"]


  



  [ GitHub ]


  

  


# File 'lib/csv/row.rb', line 530



def fields(*headers_and_or_indices)
  if headers_and_or_indices.empty?  # return all fields--no arguments
    @row.map(&:last)
  else                              # or work like values_at()
    all = []
    headers_and_or_indices.each do |h_or_i|
      if h_or_i.is_a? Range
        index_begin = h_or_i.begin.is_a?(Integer) ? h_or_i.begin :
                                                    index(h_or_i.begin)
        index_end   = h_or_i.end.is_a?(Integer)   ? h_or_i.end :
                                                    index(h_or_i.end)
        new_range   = h_or_i.exclude_end? ? (index_begin...index_end) :
                                            (index_begin..index_end)
        all.concat(fields.values_at(new_range))
      else
        all << field(*Array(h_or_i))
      end
    end
    return all
  end
end


  








  

    #has_key?(header)  ⇒ Boolean     Also known as: #include?, #key?, #member?, #header?
  



  

    

Returns true if there is a field with the given header, false otherwise.


  



  [ GitHub ]


  

  


# File 'lib/csv/row.rb', line 279



def has_key?(header)
  !!@row.assoc(header)
end


  








  

    #header?(header)  
  



  

    

Alias for #has_key?.


  



  [ GitHub ]


  

  


# File 'lib/csv/row.rb', line 285



alias_method :header?,  :has_key?


  








  

    #headers  ⇒ array_of_headers   



  

    

Returns the headers for this row:



source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
table = CSV.parse(source, headers: true)
row = table.first
row.headers # => ["Name", "Value"]


  



  [ GitHub ]


  

  


# File 'lib/csv/row.rb', line 160



def headers
  @row.map(&:first)
end


  








  

    #include?(header)  
  



  

    

Alias for #has_key?.


  



  [ GitHub ]


  

  


# File 'lib/csv/row.rb', line 282



alias_method :include?, :has_key?


  








  

    

      #index(header)  ⇒ index 
      #index(header, offset)  ⇒ index 
    

  



  

    

Returns the index for the given header, if it exists; otherwise returns nil.



With the single argument header, returns the index of the first-found field with the given header:



source = "Name,Name,Name\nFoo,Bar,Baz\n"
table = CSV.parse(source, headers: true)
row = table[0]
row.index('Name') # => 0
row.index('NAME') # => nil



With arguments header and offset, returns the index of the first-found field with given header, but ignoring the first offset fields:



row.index('Name', 1) # => 1
row.index('Name', 3) # => nil


  





  


  [ GitHub ]


  

  


# File 'lib/csv/row.rb', line 573



def index(header, minimum_index = 0)
  # find the pair
  index = headers[minimum_index..-1].index(header)
  # return the index at the right offset, if we found one
  index.nil? ? nil : index + minimum_index
end


  








  

    #initialize_copy(other_row)  ⇒ self   



  

    

Calls superclass method.


  



  [ GitHub ]


  

  


# File 'lib/csv/row.rb', line 130



def initialize_copy(other)
  super_return_value = super
  @row = @row.collect(&:dup)
  super_return_value
end


  








  

    #inspect  ⇒ String   



  

    

Returns an ASCII-compatible String showing:


  • 

    Class CSV::Row.
    

  • 

    Header-value pairs.
    




Example:



source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
table = CSV.parse(source, headers: true)
row = table[0]
row.inspect # => "#<CSV::Row \"Name\":\"foo\" \"Value\":\"0\">"


  



  [ GitHub ]


  

  


# File 'lib/csv/row.rb', line 740



def inspect
  str = ["#<", self.class.to_s]
  each do |header, field|
    str << " " << (header.is_a?(Symbol) ? header.to_s : header.inspect) <<
           ":" << field.inspect
  end
  str << ">"
  begin
    str.join('')
  rescue  # any encoding error
    str.map do |s|
      e = Encoding::Converter.asciicompat_encoding(s.encoding)
      e ? s.encode(e) : s.force_encoding("ASCII-8BIT")
    end.join('')
  end
end


  








  

    #key?(header)  
  



  

    

Alias for #has_key?.


  



  [ GitHub ]


  

  


# File 'lib/csv/row.rb', line 283



alias_method :key?,     :has_key?


  








  

    #member?(header)  
  



  

    

Alias for #has_key?.


  



  [ GitHub ]


  

  


# File 'lib/csv/row.rb', line 284



alias_method :member?,  :has_key?


  








  

    #push(*values)  ⇒ self   



  

    

Appends each of the given values to self as a field; returns self:



source = "Name,Name,Name\nFoo,Bar,Baz\n"
table = CSV.parse(source, headers: true)
row = table[0]
row.push('Bat', 'Bam')
row # => #<CSV::Row "Name":"Foo" "Name":"Bar" "Name":"Baz" nil:"Bat" nil:"Bam">


  



  [ GitHub ]


  

  


# File 'lib/csv/row.rb', line 410



def push(*args)
  args.each { |arg| self << arg }

  self  # for chaining
end


  








  

    #to_ary  
  

  [ GitHub ]


  

  


# File 'lib/csv/row.rb', line 675



alias_method :to_ary, :to_a


  








  

    #to_csv  ⇒ csv_string     Also known as: #to_s
  



  

    

Returns the row as a CSV ::String. Headers are not included:



source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
table = CSV.parse(source, headers: true)
row = table[0]
row.to_csv # => "foo,0\n"


  



  [ GitHub ]


  

  


# File 'lib/csv/row.rb', line 694



def to_csv(**options)
  fields.to_csv(**options)
end


  








  

    #to_h  ⇒ Hash     Also known as: #to_hash
  



  

    

Returns the new Hash formed by adding each header-value pair in self as a key-value pair in the Hash.



source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
table = CSV.parse(source, headers: true)
row = table[0]
row.to_h # => {"Name"=>"foo", "Value"=>"0"}



Header order is preserved, but repeated headers are ignored:



source = "Name,Name,Name\nFoo,Bar,Baz\n"
table = CSV.parse(source, headers: true)
row = table[0]
row.to_h # => {"Name"=>"Foo"}


  



  [ GitHub ]


  

  


# File 'lib/csv/row.rb', line 653



def to_h
  hash = {}
  each do |key, _value|
    hash[key] = self[key] unless hash.key?(key)
  end
  hash
end


  








  

    #to_hash  
  



  

    

Alias for #to_h.


  



  [ GitHub ]


  

  


# File 'lib/csv/row.rb', line 660



alias_method :to_hash, :to_h


  








  

    #to_s(**options)  
  



  

    

Alias for #to_csv.


  



  [ GitHub ]


  

  


# File 'lib/csv/row.rb', line 697



alias_method :to_s, :to_csv


  








  

    #values_at(*headers_and_or_indices)  
  



  

    

Alias for #fields.


  



  [ GitHub ]


  

  


# File 'lib/csv/row.rb', line 551



alias_method :values_at, :fields