class CSV::Row

CSV::Row

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>

Attributes

row[R]

Internal data format used to compare equality.

Public Class Methods

CSV::Row.new(headers, fields, header_row = false) → csv_row click to toggle source

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
# File 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

Public Instance Methods

row << [header, value] → self click to toggle source
row << hash → self
row << 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">
# File 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
row == other → true or false click to toggle source

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
# File 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
row[index] = value → value click to toggle source
row[header, offset] = value → value
row[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>
# File 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 click to toggle source

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

# File csv/row.rb, line 682
def deconstruct
  fields
end
deconstruct_keys(keys) → hash click to toggle source

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

# File 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) → [header, value] or nil click to toggle source
delete(header) → [header, value] or empty_array
delete(header, offset) → [header, value] or empty_array

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) # => []
# File 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 click to toggle source

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>
# File 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 click to toggle source

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
# File 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 click to toggle source

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>
# File csv/row.rb, line 610
def each(&block)
  return enum_for(__method__) { size } unless block_given?

  @row.each(&block)

  self  # for chaining
end
Also aliased as: each_pair
each_pair(&block)
Alias for: each
fetch(header) → value click to toggle source
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'"
# File 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 click to toggle source
field(header) → value
field(header, offset) → value

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.

# File 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
Also aliased as: []
field?(value) → true or false click to toggle source

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
# File csv/row.rb, line 589
def field?(data)
  fields.include? data
end
field_row? → true or false click to toggle source

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

# File csv/row.rb, line 148
def field_row?
  not header_row?
end
fields(*specifiers) → array_of_fields click to toggle source

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"]
# File 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
Also aliased as: values_at
has_key?(header) → true or false click to toggle source

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

# File csv/row.rb, line 279
def has_key?(header)
  !!@row.assoc(header)
end
Also aliased as: include?, key?, member?, header?
header?(header)
Alias for: has_key?
header_row? → true or false click to toggle source

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

# File csv/row.rb, line 140
def header_row?
  @header_row
end
headers → array_of_headers click to toggle source

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"]
# File csv/row.rb, line 160
def headers
  @row.map(&:first)
end
include?(header)
Alias for: has_key?
index(header) → index click to toggle source
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
# File 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 click to toggle source

Calls superclass method.

Calls superclass method
# File csv/row.rb, line 130
def initialize_copy(other)
  super_return_value = super
  @row = @row.collect(&:dup)
  super_return_value
end
inspect → string click to toggle source

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\">"
# File 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?
member?(header)
Alias for: has_key?
push(*values) → self click to toggle source

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">
# File csv/row.rb, line 410
def push(*args)
  args.each { |arg| self << arg }

  self  # for chaining
end
to_csv → csv_string click to toggle source

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"
# File csv/row.rb, line 694
def to_csv(**options)
  fields.to_csv(**options)
end
Also aliased as: to_s
to_h → hash click to toggle source

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"}
# File csv/row.rb, line 653
def to_h
  hash = {}
  each do |key, _value|
    hash[key] = self[key] unless hash.key?(key)
  end
  hash
end
Also aliased as: to_hash
to_hash()
Alias for: to_h
to_s(**options)
Alias for: to_csv
values_at(*headers_and_or_indices)
Alias for: fields