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| ### Problem, rigid dependency injection ### | |
| class Demo | |
| def initialize | |
| @instancev = Something.new | |
| end | |
| def method_1 | |
| do_that | |
| @instancev.something | |
| end | |
| def method_2 | |
| filter_something | |
| @instancev.orother | |
| end | |
| end | |
| ### Solution (Factory method) ### | |
| class Demo | |
| def something | |
| Something | |
| end | |
| def will_use_something | |
| s = something.new | |
| s.awesome_stuff | |
| end | |
| # `will_use_something` has no side effects | |
| def change_something_state | |
| s = somthing.new.mutate | |
| s.awesome_stuff | |
| end | |
| end | |
| ### Solution (Singleton method) ### | |
| class Demo | |
| def something | |
| @something ||= Something.new | |
| end | |
| def will_use_something | |
| something.awesome_stuff | |
| end | |
| # Side effects as `will_use_something` might return something else now. | |
| def change_something_state | |
| something.mutate! | |
| end | |
| end | |
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