conditional chaining in ruby
chaining, ruby
Solution
You could put your methods into an array and then execute everything in this array
l= []
l << :method_a if a
l << :method_b if b
l << :method_c if c
l.inject(object) { |obj, method| obj.send(method) }
`Object#send` executes the method with the given name. `Enumerable#inject` iterates over the array, while giving the block the last returned value and the current array item.
If you want your method to take arguments you could also do it this way
l= []
l << [:method_a, arg_a1, arg_a2] if a
l << [:method_b, arg_b1] if b
l << [:method_c, arg_c1, arg_c2, arg_c3] if c
l.inject(object) { |obj, method_and_args| obj.send(*method_and_args) }
Problem
Is there a good way to chain methods conditionally in Ruby? What I want to do functionally is ``` if a && b && c my_object.some_method_because_of_a.some_method_because_of_b.some_method_because_of_c elsif a && b && !c my_object.some_method_because_of_a.some_method_because_of_b elsif a && !b && c my_object.some_method_because_of_a.some_method_because_of_c etc... ``` So depending on a number of conditions I want to work out what methods to call in the method chain. So far my best attempt to do this in a "good way" is to conditionally build the string of methods, and use `eval`, but surely there is a better, more ruby, way?