Add Patch

[ashtonian]

Proper patch, multi resource, support multiple resources same query. diff between null, undefined, and "" or 0.

[ashtonian]

example body:

[
{
   "op":"test",
   "path":"/a/b/c",
   "value":"foo"
 },
 {
   "op":"remove",
   "path":"/a/b/c"
 },
 {
   "op":"add",
   "path":"/a/b/c",
   "value":[
     "foo",
     "bar"
   ]
 },
 {
   "op":"replace",
   "path":"/a/b/c",
   "value":42
 },
 {
   "op":"move",
   "from":"/a/b/c",
   "path":"/a/b/d"
 },
 {
   "op":"copy",
   "from":"/a/b/d",
   "path":"/a/b/e"
 }
]

limit to replace (+ maybe remove) implementation initially.

Ideal:
ParseFields, verify name, verify type, verify op is allowed.

[ashtonian]

Patchy:

type Op struct {
Operation string 
From string 
Path String 
Value interface{}
}

// created using reflection once, then used every query to generate sql. 
type PatchSpec struct {
TargetResource string 
Fields  []PatchField
}

type PatchField struct {
AllowedOps string
TargetType string
Validator func // only need two funcs
Converter func
Filter func
}

func (op *Op) GetValue() interface{} {
} 

type Error struct {
Attempted Op
Reason string 
Code int // custom 
}

allow 201 status code with soft rejections. SQL util to generate sql statement from []OP.

[ashtonian]

https://tools.ietf.org/html/rfc6902

[ashtonian]

https://tools.ietf.org/html/rfc5789