Setting values in array iteratively in ruby

Question

Is there a simpler way to do this in ruby?

ops_schema_name = "ops"
tables.each do |table|
  table.schema_name = ops_schema_name
end

When reading properties, is it as simple as tables.collect(&:schema_name)? I am assuming there is a shortcut for setters.

Jörg W Mittag · Accepted Answer · 2014-03-09 08:05:20Z

2

You could do

schema_name_updater = -> table { table.schema_name = 'ops' }
tables.each(&schema_name_updater)

answered Mar 9, 2014 at 8:05

Jörg W Mittag

371k79 gold badges457 silver badges666 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

Wayne Conrad Over a year ago

Good example. Not simpler, but probably the simplest alternative way of doing it that there is.

sawa Over a year ago

&->x{ versus {|x|. It is subtle whether you can call this a shortcut.

Rafa Paez · Accepted Answer · 2014-03-09 16:07:39Z

0

Based on the good Jörg's answer, I came up with this generic solution, for any kind of objects and any number of attributes:

attrs_setter = -> obj, attrs { attrs.each { |k, v| obj.send("#{k}=", v) } }

$> tables.each { |table| attrs_setter.call(table, { :name => 'ops' }) }

$> Obj = Struct.new(:a, :b)
# => Obj
$> objs = Array.new(2) { |i| i = Obj.new('hi', 'there') }
# => [#<struct Obj a="hi", b="there">, #<struct Obj a="hi", b="there">] 
$> objs.each { |obj| attrs_setter.call(obj, { a: 'good', b: 'bye' } ) }
# => [#<struct Obj a="good", b="bye">, #<struct Obj a="good", b="bye">]

answered Mar 9, 2014 at 16:07

Rafa Paez

4,87023 silver badges35 bronze badges

Collectives™ on Stack Overflow

Setting values in array iteratively in ruby

2 Answers 2

2 Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

2 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related