Ability to resolve multiple implementations of same type #154
Conversation
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So the first question is why? I'm not sure of the use case or what problem this will solve. Secondarily, if you're nesting containers for mocking or modularization, then the current code only gets the first set of items it finds. It doesn't get "all" of them. |
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Valid question! To your first one: being able to resolve multiple instances of the same registered type is something I am used to when working with .Net. Microsofts Dependency Injection framework and Autofac provide options for that. Good catch on the nested containers, will look into that. |
…tions of some kind
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@hmlongco I addressed your feedback about the nested containers. Can you please review? |
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Went through this again and found that it still suffers from a bug when handling multiple containers. Functionally this mechanism gathers up all of the named containers and stuffs them into an array so you can call them as needed. Right? So what happens if container B is a child of container A... and container A has a named registration of "Fred" that was supposed to override the Fred in container B? In the current implementation both Freds will be gathered, returned and executed... and I don't think that's the desired result. |
…orrectly respecting the container hierarchy.
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Didn't consider that. Made some additions and adjustments. @hmlongco |
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Terribly sorry for the delay. Been working on getting Factory, my latest DI system, out the door. I'll put this in if you still want it, but one more change is needed; Throwing a fatal error if nothing is found doesn't make sense. Just return an empty array. |
Sources/Resolver/Resolver.swift
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| if let registrations = root.lookupAll(type) { | ||
| return registrations.compactMap { reg in return reg.resolve(resolver: root, args: args) } | ||
| } | ||
| fatalError("RESOLVER: '\(Service.self)' types not resolved.") |
Sources/Resolver/Resolver.swift
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| if let registrations = lookupAll(type) { | ||
| return registrations.compactMap { reg in return reg.scope.resolve(registration: reg, resolver: self, args: args) } | ||
| } | ||
| fatalError("RESOLVER: '\(Service.self)' types not resolved.") |
…e found for looking up multiple implementations and fixed registration key
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Addressed your PR review comments @hmlongco Sorry for my delay this time (was on PTO). |
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Hello, we need that too! @hmlongco did you have time to review the PR? |
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This PR adds the ability to resolve all registered implementations for a given type, where the implementations are differentiated by names.
Please let me know what I can optimize.