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// Copyright 2012-2015 Oliver Eilhard. All rights reserved.
// Use of this source code is governed by a MIT-license.
// See http://olivere.mit-license.org/license.txt for details.
package elastic
// Filters documents where a specific field has no value in them.
// For details, see:
// http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/query-dsl-missing-filter.html
type MissingFilter struct {
Filter
name string
filterName string
nullValue *bool
existence *bool
}
func NewMissingFilter(name string) MissingFilter {
f := MissingFilter{name: name}
return f
}
func (f MissingFilter) FilterName(filterName string) MissingFilter {
f.filterName = filterName
return f
}
func (f MissingFilter) NullValue(nullValue bool) MissingFilter {
f.nullValue = &nullValue
return f
}
func (f MissingFilter) Existence(existence bool) MissingFilter {
f.existence = &existence
return f
}
func (f MissingFilter) Source() interface{} {
// {
// "missing" : {
// "field" : "..."
// }
// }
source := make(map[string]interface{})
params := make(map[string]interface{})
source["missing"] = params
params["field"] = f.name
if f.nullValue != nil {
params["null_value"] = *f.nullValue
}
if f.existence != nil {
params["existence"] = *f.existence
}
if f.filterName != "" {
params["_name"] = f.filterName
}
return source
}
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