#' UnionRelation
#'
#' @export
#' @format \code{\link{R6Class}} object, super class \code{\link{Relation}}.
#' @field id of type String inherited from super class \code{\link{IdObject}}.
#' @field relations list of class \code{\link{Relation}}.
UnionRelation <- R6::R6Class("UnionRelation", inherit = Relation, public = list(relations = NULL,
initialize = function(json = NULL) {
super$initialize(json = json)
}, init = function() {
super$init()
self$relations = list()
}, initJson = function(json) {
super$initJson(json)
self$relations = lapply(json$relations, createObjectFromJson)
}, toTson = function() {
m = super$toTson()
m$kind = tson.scalar("UnionRelation")
m$relations = lapply(self$relations, function(each) each$toTson())
return(m)
}))
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