document.go

Documentation: github.com/go-kivik/kivik/v4

     1  // Licensed under the Apache License, Version 2.0 (the "License"); you may not
     2  // use this file except in compliance with the License. You may obtain a copy of
     3  // the License at
     4  //
     5  //  http://www.apache.org/licenses/LICENSE-2.0
     6  //
     7  // Unless required by applicable law or agreed to in writing, software
     8  // distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
     9  // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
    10  // License for the specific language governing permissions and limitations under
    11  // the License.
    12  
    13  package kivik
    14  
    15  import (
    16  	"encoding/json"
    17  )
    18  
    19  // document represents any CouchDB document.
    20  type document struct {
    21  	ID          string                 `json:"_id"`
    22  	Rev         string                 `json:"_rev"`
    23  	Attachments *Attachments           `json:"_attachments,omitempty"`
    24  	Data        map[string]interface{} `json:"-"`
    25  }
    26  
    27  // MarshalJSON satisfies the json.Marshaler interface
    28  func (d *document) MarshalJSON() ([]byte, error) {
    29  	var data []byte
    30  	doc, err := json.Marshal(*d)
    31  	if err != nil {
    32  		return nil, err
    33  	}
    34  	if len(d.Data) > 0 {
    35  		var err error
    36  		if data, err = json.Marshal(d.Data); err != nil {
    37  			return nil, err
    38  		}
    39  		doc[len(doc)-1] = ','
    40  		return append(doc, data[1:]...), nil
    41  	}
    42  	return doc, nil
    43  }
    44  
    45  // UnmarshalJSON satisfies the json.Unmarshaler interface.
    46  func (d *document) UnmarshalJSON(p []byte) error {
    47  	type internalDoc document
    48  	doc := &internalDoc{}
    49  	if err := json.Unmarshal(p, &doc); err != nil {
    50  		return err
    51  	}
    52  	data := make(map[string]interface{})
    53  	if err := json.Unmarshal(p, &data); err != nil {
    54  		return err
    55  	}
    56  	delete(data, "_id")
    57  	delete(data, "_rev")
    58  	delete(data, "_attachments")
    59  	*d = document(*doc)
    60  	d.Data = data
    61  	return nil
    62  }
    63
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