> I was under the impression it wouldn't omit the array if it had zero length, hence my question.
Using omitempty omits the array/slice field in the encoding if it is zero length. Check out https://play.golang.org/p/B1LcICyEfeK. Related encoding/json <https://golang.org/pkg/encoding/json/> package doc for omitempty: The "omitempty" option specifies that the field should be omitted from the encoding if the field has an empty value, defined as false, 0, a nil pointer, a nil interface value, and any empty array, slice, map, or string. where "empty array, slice" means a slice that is nil or is of zero length. On Friday, September 4, 2020 at 4:12:13 AM UTC+5:30 bbse...@gmail.com wrote: > On Thu, Sep 3, 2020 at 2:32 PM Alexander Mills > <alexande...@gmail.com> wrote: > > > > I was under the impression it wouldn't omit the array if it had zero > length, hence my question.. > > i mean at some point we want an empty array in JSON, so I assume it's > included by default > > If you define boolField as a type, then you can have a custom > marshaler that checks array sizes, something like this: > > func (b boolField) MarshalJSON() ([]byte,error) { > data:=map[string]interface{}{} > if len(b.Must)>0 { > data["must"]=b.Must > } > ... > return json.Marshal(data) > } > > > > > On Thursday, September 3, 2020 at 3:35:05 AM UTC-7 nishanth...@gmail.com > wrote: > >> > >> > how do I omit an array on boolField if the array is empty? > >> > >> Do you mean how to omit an empty array's field in the serialized JSON? > If so, you can use "omitempty" like you did in the other type. > >> > >> var boolField struct { > >> Must []HasTermOrMatch `json:"must,omitempty"` > >> MustNot []HasTermOrMatch `json:"must_not,omitempty"` > >> Filter []HasTermOrMatch `json:"filter,omitempty"` > >> Should []HasTermOrMatch `json:"should,omitempty"` > >> } > >> > >> This should omit the slice field in the serialized JSON if the slice is > nil or zero length. > >> On Thursday, September 3, 2020 at 1:08:00 AM UTC+5:30 Alexander Mills > wrote: > >>> > >>> I have this code used to construct an ElasticSearch json query: > >>> > >>> ``` > >>> type Term = map[string]interface{} > >>> type QueryString = map[string]interface{} > >>> type Range = map[string]interface{} > >>> type Match = map[string]string > >>> > >>> type HasTermOrMatch = struct { > >>> Term `json:"term,omitempty"` > >>> QueryString `json:"query_string,omitempty"` > >>> Match `json:"match,omitempty"` > >>> Range `json:"range,omitempty"` > >>> } > >>> > >>> var boolField struct { > >>> Must []HasTermOrMatch `json:"must"` > >>> MustNot []HasTermOrMatch `json:"must_not"` > >>> Filter []HasTermOrMatch `json:"filter"` > >>> Should []HasTermOrMatch `json:"should"` > >>> } > >>> ``` > >>> > >>> my question is - how do I omit an array on boolField if the array is > empty? > >>> > >>> I hear there might be an interface I can add something like this: > >>> > >>> > >>> func (v Match) IsZero() bool { > >>> return len(v) < 1 > >>> } > >>> > >>> func (v Term) IsZero() bool { > >>> return len(v) < 1 > >>> } > >>> > >>> func (v Range) IsZero() bool { > >>> return len(v) < 1 > >>> } > >>> > >>> func (v QueryString) IsZero() bool { > >>> return len(v) < 1 > >>> } > >>> > >>> > >>> anyone know how to do this? > >>> thanks > >>> -alex > >>> > >>> > >>> > >>> > > -- > > You received this message because you are subscribed to the Google > Groups "golang-nuts" group. > > To unsubscribe from this group and stop receiving emails from it, send > an email to golang-nuts...@googlegroups.com. > > To view this discussion on the web visit > https://groups.google.com/d/msgid/golang-nuts/7df1c875-ed2e-46c4-a6f3-2064485de805n%40googlegroups.com > . > -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/golang-nuts/acd36ffe-124d-4415-ad23-beb0f9377c21n%40googlegroups.com.
