#' Generate a line-delimited JSON string for use in Elasticsearch bulk updates
#'
#' Generate a line-delimited JSON string for use in Elasticsearch bulk updates
#' Type can be either one of three values:
#' set: set the value of [varname] to x
#' add: add x to the values of [varname]
#' varname: When using ud, the ud field will be updated instead of a computerCodes field
#' @param x A single-row data frame, or a string containing the variables and/or values that should be updated (a data frame is converted to a JSON object, strings are stored as-is)
#' @param index The name of the Elasticsearch index to update
#' @param varname String indicating the parent variable that should be updated (when it does not exist, it will be created, all varnames are prefixed by computerCodes)
#' @param type Type of updating to be done, can be either 'set', 'add', or 'addnested'
#' @param ver Short string (preferably a single word/sequence) indicating the version of the updated document (i.e. for a udpipe update this string might be 'udV2')
#' @return A string usable as Elasticsearch bulk update command, in line-delimited JSON
#' @export
#' @examples
#' bulk_writer(x, index = 'maml')
#################################################################################################
#################################### Bulk update writer ################################
#################################################################################################
bulk_writer <- function ( x , index = ' maml' , varname , type , ver ) {
### Create a json object if more than one variable besides _id, otherwise use value as-is
if ( length ( x ) > 2 ) {
json <- toJSON ( list ( x [ -1 ] ) , collapse = T )
} else {
names ( x ) <- NULL
json <- toJSON ( x [ -1 ] , collapse = T )
}
if ( varname == " ud" ) {
return (
paste0 ( ' {"update": {"_index": "' , index , ' ", "_type": "_doc", "_id": "' , x [1 ] , ' " } }
{ " script" : { " source" : " ctx._source.version = \\" ' ,ver,' \ \ " ; ctx._source.ud = params.code; ctx._source.remove(\\" tokens \ \ " )" , " lang" : " painless" , " params" : { " code" : ' ,json,' } } } ' )
)
}
if ( type == ' set' ) {
return (
paste0 ( ' {"update": {"_index": "' , index , ' ", "_type": "_doc", "_id": "' , x [1 ] , ' " } }
{ " script" : { " source" : " ctx._source.version = \\" ' ,ver,' \ \ " ; if (ctx._source.computerCodes != null) {ctx._source.computerCodes.',varname,' = params.code} else {ctx._source.computerCodes = params.object}" , " lang" : " painless" , " params" : { " code" : ' ,json,' , " object" : { " ',varname,'" : ' ,json,' } } } } ' )
)
}
if ( type == " add" ) {
return (
paste0 ( ' {"update": {"_index": "' , index , ' ", "_type": "_doc", "_id": "' , x [1 ] , ' " } }
{ " script" : { " source" : " ctx._source.version = \\" ' ,ver,' \ \ " ; if (ctx._source.computerCodes != null && ctx._source.computerCodes.containsKey(\\" ' ,varname,' \ \ " )) {ctx._source.computerCodes.',varname,'.addAll(params.code)} else if (ctx._source.computerCodes != null) {ctx._source.computerCodes.',varname,' = params.code} else {ctx._source.computerCodes = params.object}" , " lang" : " painless" , " params" : { " code" : ' ,json,' , " object" : { " ',varname,'" : ' ,json,' } } } } '
)
)
}
}
