diff --git a/R/Groups.R b/R/Groups.R
new file mode 100644
index 0000000..740ed39
--- /dev/null
+++ b/R/Groups.R
@@ -0,0 +1,50 @@
+
+group_id <- function(name, ...) {
+  checkmate::assert_string(name)
+  conn_ref <- modb_conn_ref(args = list(...))
+
+  res <- .Call(c_rmodb_groupId, conn_ref, name)
+  return(res)
+}
+group_exists <- function(name, ...) {
+  return(!is.na(group_id(name)))
+}
+group_create <- function(name, id = NULL, ...) {
+  checkmate::assert_string(name)
+  if (!checkmate::test_null(id)) {
+    checkmate::assert_int(id)
+  } else {
+    id <- 0
+  }
+  conn_ref <- modb_conn_ref(args = list(...))
+
+  res <- .Call(c_rmodb_createGroup, conn_ref, as.integer(id), name)
+  return(res)
+}
+group_delete <- function(id, ...) {
+  checkmate::assert_int(id)
+  conn_ref <- modb_conn_ref(args = list(...))
+
+  res <- .Call(c_rmodb_deleteGroup, conn_ref, as.integer(id))
+  return(res)
+}
+group <- function(id, withMembers = TRUE, ...) {
+  checkmate::assert_int(id)
+  checkmate::assert_logical(withMembers)
+  conn_ref <- modb_conn_ref(args = list(...))
+
+  res <- .Call(c_rmodb_group, conn_ref, as.integer(id), as.logical(withMembers))
+  return(res)
+}
+groups <- function(withMembers = FALSE, withDeleted = FALSE, ...)
+{
+  checkmate::assert_logical(withMembers)
+  checkmate::assert_logical(withDeleted)
+  conn_ref <- modb_conn_ref(args = list(...))
+
+  res <- .Call(
+    c_rmodb_groups, conn_ref, as.logical(withMembers), as.logical(withDeleted)
+  )
+
+  return(res)
+}
\ No newline at end of file
diff --git a/R/Helpers.R b/R/Helpers.R
new file mode 100644
index 0000000..00f4852
--- /dev/null
+++ b/R/Helpers.R
@@ -0,0 +1,23 @@
+
+check_namesInclude = function(x, one.of = list(), all.of = list()) {
+  gotOne <- 0
+  gotX <- 0
+  for (n in x) {
+    if (n %in% one.of) {
+      return(TRUE)
+    }
+    if (n %in% all.of) {
+      gotX <- gotX + 1
+    }
+  }
+  if (gotX != length(all.of)) {
+    return(FALSE)
+  }
+  if (length(one.of) > 0 && gotOne == 0) {
+    return(FALSE)
+  }
+
+  return(TRUE)
+}
+test_namesInclude <- checkmate::makeTestFunction(check_namesInclude)
+assert_namesInclude <- checkmate:: makeAssertionFunction(check_namesInclude)
\ No newline at end of file
diff --git a/R/Metaobject.R b/R/Metaobject.R
new file mode 100644
index 0000000..be15122
--- /dev/null
+++ b/R/Metaobject.R
@@ -0,0 +1,100 @@
+
+metaobject_ids <- function(title, ...) {
+  checkmate::assert_string(title)
+  conn_ref <- modb_conn_ref(args = list(...))
+
+  res <- .Call(c_rmodb_metaobjectId, conn_ref, title)
+
+  return(res)
+}
+
+metaobject_create <- function(meta, obj, id = NULL, ...) {
+  if (!checkmate::test_null(id)) {
+    checkmate::assert_int(id)
+  } else {
+    id <- 0
+  }
+
+  checkmate::assert_list(meta)
+  checkmate::assert_names(names(meta), must.include = c("title"))
+  assert_namesInclude(names(meta), one.of = c("owner", "owner_id"))
+  if (test_namesInclude(names(meta), all.of = c("owner"))) {
+    checkmate::assert_class(meta$owner, "modb_user")
+    meta$owner_id <- meta$owner$id
+  } else {
+    checkmate::assert_int(meta$owner_id)
+  }
+  meta$owner_id <- as.integer(meta$owner_id)
+
+  assert_namesInclude(names(meta), one.of = c("groups", "group_ids"))
+  if (checkmate::test_null(meta$group_ids)) {
+    meta$group_ids <- list()
+  } else if (test_namesInclude(names(meta), all.of = c("groups"))) {
+    meta$group_ids <- list()
+    for (g in meta$groups) {
+      checkmate::assert_class(g, "modb_group")
+      meta$group_ids <- c(meta$group_ids, g$id)
+    }
+  } else if (checkmate::test_list(meta$group_ids)) {
+    if (length(meta$group_ids) > 0) {
+      checkmate::assert_integerish(unlist(meta$group_ids))
+    }
+  } else {
+    checkmate::assert_integerish(meta$group_ids)
+  }
+  meta$group_ids <- c(as.integer(meta$group_ids))
+
+  if (!checkmate::test_null(id)) {
+    checkmate::assert_int(id)
+    id <- id
+  } else {
+    if (test_namesInclude(names(meta), all.of = c("id"))) {
+      checkmate::assert_int(meta$id)
+      id <- meta$id
+    }
+  }
+
+  conn_ref <- modb_conn_ref(args = list(...))
+
+  meta_fields <- c(
+    "id", "title", "owner_id", "owner", "groups", "group_ids",
+    "created_on", "updated_on", "deleted_on"
+  )
+  ext <- meta[!(names(meta) %in% meta_fields)]
+  meta <- meta[names(meta) %in% c("title", "owner_id", "group_ids")]
+
+
+  utils::str(meta)
+  utils::str(ext)
+  utils::str(obj)
+
+  res <- .Call(c_rmodb_createMetaobject, conn_ref, as.integer(id), meta, obj, ext)
+
+  return(res)
+}
+metaobject_delete <- function(id, ...) {
+  checkmate::assert_int(id)
+  conn_ref <- modb_conn_ref(args = list(...))
+
+  res <- .Call(c_rmodb_deleteMetaobject, conn_ref, as.integer(id))
+  return(res)
+}
+metaobject <- function(id, ...) {
+  checkmate::assert_int(id)
+  conn_ref <- modb_conn_ref(args = list(...))
+
+  res <- .Call(c_rmodb_metaobject, conn_ref, as.integer(id))
+
+  return(res)
+}
+metaobjects <- function(withDeleted = FALSE, ...)
+{
+  checkmate::assert_logical(withDeleted)
+  conn_ref <- modb_conn_ref(args = list(...))
+
+  res <- .Call(
+    c_rmodb_metaobjects, conn_ref, as.logical(withDeleted)
+  )
+
+  return(res)
+}
\ No newline at end of file
diff --git a/R/UserGroups.R b/R/UserGroups.R
new file mode 100644
index 0000000..060f707
--- /dev/null
+++ b/R/UserGroups.R
@@ -0,0 +1,44 @@
+
+link_user_group <- function(user, group, ...) {
+  conn_ref <- modb_conn_ref(args = list(...))
+  if (checkmate::test_list(user)) {
+    checkmate::assert_names(names(user), must.include = c("id"))
+    user_id <- as.integer(user$id)
+  } else {
+  checkmate::assert_int(user)
+    user_id <- as.integer(user)
+  }
+  if (checkmate::test_list(group)) {
+    checkmate::assert_names(names(group), must.include = c("id"))
+    group_id <- as.integer(group$id)
+  } else {
+  checkmate::assert_int(group)
+    group_id <- as.integer(group)
+  }
+
+  res <- .Call(c_rmodb_userAddGroup, conn_ref, user_id, group_id)
+
+  return(res)
+}
+
+unlink_user_group <- function(user, group, ...) {
+  conn_ref <- modb_conn_ref(args = list(...))
+  if (checkmate::test_list(user)) {
+    checkmate::assert_names(names(user), must.include = c("id"))
+    user_id <- as.integer(user$id)
+  } else {
+    checkmate::assert_int(user)
+    user_id <- as.integer(user)
+  }
+  if (checkmate::test_list(group)) {
+    checkmate::assert_names(names(group), must.include = c("id"))
+    group_id <- as.integer(group$id)
+  } else {
+    checkmate::assert_int(group)
+    group_id <- as.integer(group)
+  }
+
+  res <- .Call(c_rmodb_userRemoveGroup, conn_ref, user_id, group_id)
+
+  return(res)
+}
\ No newline at end of file
diff --git a/R/Users.R b/R/Users.R
new file mode 100644
index 0000000..b601f93
--- /dev/null
+++ b/R/Users.R
@@ -0,0 +1,52 @@
+
+user_id <- function(name, ...) {
+  checkmate::assert_string(name)
+  conn_ref <- modb_conn_ref(args = list(...))
+
+  res <- .Call(c_rmodb_userId, conn_ref, name)
+  return(res)
+}
+user_exists <- function(name, ...) {
+  return(!is.na(user_id(name)))
+}
+user_create <- function(name, email,  id = NULL, ...) {
+  checkmate::assert_string(name)
+  checkmate::assert_string(email)
+  if (!checkmate::test_null(id)) {
+    checkmate::assert_int(id)
+  } else {
+    id <- 0
+  }
+  conn_ref <- modb_conn_ref(args = list(...))
+
+  res <- .Call(c_rmodb_createUser, conn_ref, as.integer(id), name, email)
+  return(res)
+}
+user_delete <- function(id, ...) {
+  checkmate::assert_int(id)
+  conn_ref <- modb_conn_ref(args = list(...))
+
+  res <- .Call(c_rmodb_deleteUser, conn_ref, as.integer(id))
+  return(res)
+}
+user <- function(id, withGroups = TRUE, ...) {
+  checkmate::assert_int(id)
+  checkmate::assert_logical(withGroups)
+  conn_ref <- modb_conn_ref(args = list(...))
+
+  res <- .Call(c_rmodb_user, conn_ref, as.integer(id), as.logical(withGroups))
+
+  return(res)
+}
+users <- function(withGroups = FALSE, withDeleted = FALSE, ...)
+{
+  checkmate::assert_logical(withGroups)
+  checkmate::assert_logical(withDeleted)
+  conn_ref <- modb_conn_ref(args = list(...))
+
+  res <- .Call(
+    c_rmodb_users, conn_ref, as.logical(withGroups), as.logical(withDeleted)
+  )
+
+  return(res)
+}
\ No newline at end of file