• Chris Bare (21/21) Feb 12 2021 I'm working on a project with vibe.d and ddbc to access my
• Steven Schveighoffer (5/26) Feb 12 2021 Does @ignore work? That's a UDA that tells vibe to ignore the field.
• Chris Bare (5/12) Feb 13 2021 @ignore just prevents it from throwing an error if the field is

Chris Bare <chris bareflix.com> writes:

I'm working on a project with vibe.d and ddbc to access my 
database.
Both have powerful functions that operate on Struct types to 
avoid a lot of boilerplate code.
I have a web site that sends a json message to update a record.
deserializeJson creates a new Foo record containing the json data.
However, there are some fields in the record which are not in the 
json, and these get default values.
I have another Foo that has the original values.

What would be the best way to merge the updated values into the 
original?
Obviously I can copy from one Foo to the other, but that's pretty 
inelegant.
If I could pass an existing Foo to deserializeJson and have only 
some fields filled in, that would be perfect.
I tried this:

deserializeJson!Foo(foo, req.json);

but it completely overwrites all the fields in foo.

Any suggestions? Is there a trick I'm just not seeing?

--
Chris

Steven Schveighoffer <schveiguy gmail.com> writes:

On 2/12/21 6:22 PM, Chris Bare wrote:
 I'm working on a project with vibe.d and ddbc to access my database.
 Both have powerful functions that operate on Struct types to avoid a lot 
 of boilerplate code.
 I have a web site that sends a json message to update a record.
 deserializeJson creates a new Foo record containing the json data.
 However, there are some fields in the record which are not in the json, 
 and these get default values.
 I have another Foo that has the original values.
 
 What would be the best way to merge the updated values into the original?
 Obviously I can copy from one Foo to the other, but that's pretty 
 inelegant.
 If I could pass an existing Foo to deserializeJson and have only some 
 fields filled in, that would be perfect.
 I tried this:
 
 deserializeJson!Foo(foo, req.json);
 
 but it completely overwrites all the fields in foo.
 
 Any suggestions? Is there a trick I'm just not seeing?

Does  ignore work? That's a UDA that tells vibe to ignore the field. 
Though I don't know if it means it leaves it alone completely.

https://vibed.org/api/vibe.data.serialization/ignore

-Steve

Chris Bare <chris bareflix.com> writes:

On Saturday, 13 February 2021 at 01:21:56 UTC, Steven 
Schveighoffer wrote:
 On 2/12/21 6:22 PM, Chris Bare wrote:
 [...]

 Does  ignore work? That's a UDA that tells vibe to ignore the 
 field. Though I don't know if it means it leaves it alone 
 completely.

 https://vibed.org/api/vibe.data.serialization/ignore

 -Steve

 ignore just prevents it from throwing an error if the field is 
not in the json. The field still gets overwritten with it's 
default value in the struct.