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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri">Thanks Youming,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri">Ok, thanks! I did try that, but I can’t seem to figure out how to make it actually get used in the decoding process. That being my preferred way, I tried it first. I chalked it not working
up to Swift not knowing which of the 2 init(from decoder:) functions to call, mine or theirs. But, maybe there’s something I’m missing here.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri">Any insight is appreciated.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri">Thanks!<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri">Brandon Sneed<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri"><o:p> </o:p></span></p>
<div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span style="font-family:Calibri;color:black">From: </span>
</b><span style="font-family:Calibri;color:black">Youming Lin <ylin@us.ibm.com><br>
<b>Date: </b>Wednesday, August 30, 2017 at 1:18 PM<br>
<b>To: </b>"Sneed, Brandon" <brsneed@ebay.com><br>
<b>Cc: </b>Tony Parker <anthony.parker@apple.com>, "swift-corelibs-dev@swift.org" <swift-corelibs-dev@swift.org>, "swift-corelibs-dev-bounces@swift.org" <swift-corelibs-dev-bounces@swift.org><br>
<b>Subject: </b>Re: [swift-corelibs-dev] Adding type conversion capabilities to JSON encode/decode<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<p><span style="font-size:10.0pt">Brandon<br>
<br>
></span>JSON’s types effectively end up matching specifically to primitives, of which there is no mechanism to override the behavior of how a String gets decoded for instance.<br>
<span style="font-size:10.0pt"><br>
You can override the default behavior with your own custom init(from:) implementation for your Codable struct:
</span><a href="https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdeveloper.apple.com%2Fdocumentation%2Fswift%2Fdecodable%2F2894081-init&data=02%7C01%7Cbrsneed%40ebay.com%7C6290a819253b47b0eb2408d4efe454ae%7C46326bff992841a0baca17c16c94ea99%7C0%7C0%7C636397211330551372&sdata=oLr1Q10%2BztzwG%2BCXpMinBzJNTwSy%2FjoBsKm9Glg1%2FxY%3D&reserved=0"><span style="font-size:10.0pt">https://developer.apple.com/documentation/swift/decodable/2894081-init</span></a><span style="font-size:10.0pt"><br>
<br>
You can check Foundation source code (i.e., the URL struct) on how this can be implemented.<br>
</span><br>
<span style="font-size:10.0pt">Thanks,<br>
<br>
Youming Lin<br>
IBM Cloud, Swift@IBM, Kitura developer<br>
Austin, TX<br>
GitHub: @youming-lin</span><br>
<br>
<img border="0" width="16" height="16" id="_x0000_i1025" src="cid:image001.gif@01D3219A.55A6C7B0" alt="nactive hide details for "Sneed, Brandon via swift-corelibs-dev" ---08/30"><span style="font-size:10.0pt;color:#424282">"Sneed, Brandon via swift-corelibs-dev"
---08/30/2017 03:07:05 PM---Hi Tony, I like the idea that the type itself is responsible for the conversion. My own json encode</span><br>
<br>
<span style="font-size:10.0pt;color:#5F5F5F">From: </span><span style="font-size:10.0pt">"Sneed, Brandon via swift-corelibs-dev" <swift-corelibs-dev@swift.org></span><br>
<span style="font-size:10.0pt;color:#5F5F5F">To: </span><span style="font-size:10.0pt">Tony Parker <anthony.parker@apple.com></span><br>
<span style="font-size:10.0pt;color:#5F5F5F">Cc: </span><span style="font-size:10.0pt">"swift-corelibs-dev@swift.org" <swift-corelibs-dev@swift.org></span><br>
<span style="font-size:10.0pt;color:#5F5F5F">Date: </span><span style="font-size:10.0pt">08/30/2017 03:07 PM</span><br>
<span style="font-size:10.0pt;color:#5F5F5F">Subject: </span><span style="font-size:10.0pt">Re: [swift-corelibs-dev] Adding type conversion capabilities to JSON encode/decode</span><br>
<span style="font-size:10.0pt;color:#5F5F5F">Sent by: </span><span style="font-size:10.0pt">swift-corelibs-dev-bounces@swift.org</span><o:p></o:p></p>
<div class="MsoNormal">
<hr size="2" width="100%" noshade="" style="color:#8091A5" align="left">
</div>
<p class="MsoNormal" style="margin-bottom:12.0pt"><br>
<br>
<br>
Hi Tony,<br>
<br>
I like the idea that the type itself is responsible for the conversion. My own json encode/decode library worked this way and it was really great, however in trying to leverage Swift4 into it, or to replace it, I just don’t see how that’s possible given how
it’s currently structured.<br>
<br>
JSON’s types effectively end up matching specifically to primitives, of which there is no mechanism to override the behavior of how a String gets decoded for instance. The only way I can think of to accomplish that is to create *<b>another</b>* type, JSONString
for example, but since String is a struct, I can’t subclass it, and instead need to have the real value buried inside of it … it seems to start getting messy very quickly. It also adds the obfuscation of dealing with yet another type, which I’m not against,
but just feels less than ideal.<br>
<br>
<br>
Brandon Sneed<br>
<br>
<b>From: </b><anthony.parker@apple.com> on behalf of Tony Parker <anthony.parker@apple.com><b><br>
Date: </b>Wednesday, August 30, 2017 at 11:30 AM<b><br>
To: </b>"Sneed, Brandon" <brsneed@ebay.com><b><br>
Cc: </b>Itai Ferber <iferber@apple.com>, "swift-corelibs-dev@swift.org" <swift-corelibs-dev@swift.org><b><br>
Subject: </b>Re: [swift-corelibs-dev] Adding type conversion capabilities to JSON encode/decode<br>
<br>
I’m still not convinced that we should actually provide such a strategy. <br>
<br>
Conversions like those below seem like the domain of each type that is being decoded. If, in a particular type, the “number” can be either a true number or a string, then that type can try decoding it as one or the other and fall back as required. That puts
the responsibility of doing that kind of conversion in the type itself.<br>
<br>
JSON has very few types already. I’m not sure we want to blur the line between numbers and strings automatically…<br>
<br>
- Tony<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">On Aug 30, 2017, at 11:24 AM, Sneed, Brandon via swift-corelibs-dev <<a href="mailto:swift-corelibs-dev@swift.org">swift-corelibs-dev@swift.org</a>> wrote:<br>
<br>
Hi Itai,<br>
<br>
No problem! Thanks for the heads up. Is there any way I could be involved? Happy to do the work to whatever guidance your team might have. I’m mostly just interested in it being there soon, hence volunteering.
<br>
<br>
Thanks!<br>
<br>
<br>
Brandon Sneed<br>
<br>
<b>From: </b><<a href="mailto:iferber@apple.com">iferber@apple.com</a>> on behalf of Itai Ferber <<a href="mailto:iferber@apple.com">iferber@apple.com</a>><b><br>
Date: </b>Wednesday, August 30, 2017 at 11:22 AM<b><br>
To: </b>"Sneed, Brandon" <<a href="mailto:brsneed@ebay.com">brsneed@ebay.com</a>><b><br>
Cc: </b>"<a href="mailto:swift-corelibs-dev@swift.org">swift-corelibs-dev@swift.org</a>" <<a href="mailto:swift-corelibs-dev@swift.org">swift-corelibs-dev@swift.org</a>><b><br>
Subject: </b>Re: [swift-corelibs-dev] Adding type conversion capabilities to JSON encode/decode<br>
<br>
<span style="font-family:Helvetica">Hi Brandon,</span><br>
<span style="font-family:Helvetica">Thanks for looking at this! We’ve got plans internally to potentially add a strategy to
</span><span style="font-size:10.0pt;font-family:"Courier New"">JSONEncoder</span><span style="font-family:Helvetica">/</span><span style="font-size:10.0pt;font-family:"Courier New"">JSONDecoder</span><span style="font-family:Helvetica"> to allow lenient conversions
like this — i.e. implicitly stringify numbers (or parse them from string input), among some others.<br>
This would be opt-in for consumers of </span><span style="font-size:10.0pt;font-family:"Courier New"">JSONDecoder</span><span style="font-family:Helvetica"> while not requiring any special annotations on
</span><span style="font-size:10.0pt;font-family:"Courier New"">Codable</span><span style="font-family:Helvetica"> types.</span><br>
<span style="font-family:Helvetica">— Itai</span><br>
<span style="font-family:Helvetica">On 30 Aug 2017, at 10:59, Sneed, Brandon via swift-corelibs-dev wrote:</span><br>
<span style="color:#777777">Hi everyone,</span><br>
<br>
<span style="color:#777777">Just throwing this out to see if anyone else is working on this, or has opinions/suggestions on how it’s implemented. I’d like to add this to the Codable/JSONDecoder/JSONEncoder system if no one else is working on it.</span><br>
<br>
<span style="color:#777777">Type type conversion, I mean given this JSON payload:</span><br>
<br>
<span style="color:#777777">{</span><br>
<span style="color:#777777">"name": "Endeavor”,</span><br>
<span style="color:#777777">"abv": 8.9,</span><br>
<span style="color:#777777">"brewery": "Saint Arnold”,</span><br>
<span style="color:#777777">"style": "ipa"</span><br>
<span style="color:#777777">}</span><br>
<br>
<span style="color:#777777">and a struct defined as:</span><br>
<br>
<span style="color:#777777">struct Beer: Codable {</span><br>
<span style="color:#777777">let name: String</span><br>
<span style="color:#777777">let abv: String</span><br>
<span style="color:#777777">let brewery: String</span><br>
<span style="color:#777777">let style: BeerStyle</span><br>
<span style="color:#777777">}</span><br>
<br>
<span style="color:#777777">Notice that “abv” is a number in the JSON, but a String in the struct. I’d like to make it such that I can let the system know it’s ok to convert it from a number to a string as opposed to throwing an exception. The benefits are:</span><br>
<br>
<span style="color:#777777">1. It’s defensive; service types can change without causing my application to crash.</span><br>
<span style="color:#777777">2. It allows a developer to work with the types they want to work with as opposed to what the server provides, thus saving them time of writing a custom encode/decode code for all members.</span><br>
<br>
<span style="color:#777777">The argument against it that I’ve heard is generally “it’s a service bug, make them fix it”, which is valid but the reality is we’re not all in control of the services we injest. The same type of logic could be applied to a member
name changing, though I haven’t seen this happen often in practice. I do see types in a json payload change with some frequency though. I think much of the reason stems from the fact that type conversion in javascript is effectively free, ie: you ask for a
String, you get a String if possible.</span><br>
<br>
<span style="color:#777777">To implement this type conversion in practice, looking at it from the point of view using Codable/JSON(en/de)coder, one way would be to make it opt-in:</span><br>
<br>
<span style="color:#777777">struct Beer: Codable, CodingConvertible {</span><br>
<span style="color:#777777">let name: String</span><br>
<span style="color:#777777">let abv: String</span><br>
<span style="color:#777777">let brewery: String</span><br>
<span style="color:#777777">let style: BeerStyle</span><br>
<span style="color:#777777">}</span><br>
<br>
<span style="color:#777777">I like this because looking at the struct, the members still remain clear and relatively unambiguous. The downside is it’s unknown which member is likely to get converted. And since it’s opt-in, conversion doesn’t happen if the CodingConvertible
conformance isn’t adhered to.</span><br>
<br>
<span style="color:#777777">Another option would be to box each type, like so:</span><br>
<br>
<span style="color:#777777">struct Beer: Codable {</span><br>
<span style="color:#777777">let name: String</span><br>
<span style="color:#777777">let abv: Convertible<String></span><br>
<span style="color:#777777">let brewery: String</span><br>
<span style="color:#777777">let style: BeerStyle</span><br>
<span style="color:#777777">}</span><br>
<br>
<span style="color:#777777">This seems tedious for developers, but would show which types are being converted. It does however seriously weaken benefit #1 above.</span><br>
<br>
<span style="color:#777777">Those example usages above aside, I do think it’d be best if this conversion behavior was the default and no end-developer changes required. I think that could be done without impact to code that’s been already been written against
the JSON en/decode bits.</span><br>
<br>
<span style="color:#777777">I’m very open to alternatives, other ideas, or anything else you might have to say on the subject. Thanks for reading!</span><br>
<br>
<br>
<br>
<span style="color:#777777">Brandon Sneed</span><br>
<br>
<br>
<br>
<br>
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