Fix attachment duplication on add

client/src/selectors/boolean.js

@@ -0,0 +1,11 @@
+import { createSelector } from 'redux-orm';
+
+import orm from '../orm';
+
+// eslint-disable-next-line import/prefer-default-export
+export const attachmentWithIdExistsSelector = () =>
+  createSelector(
+    orm,
+    (_, id) => id,
+    ({ Attachment }, id) => Attachment.idExists(id),
+  );

client/src/selectors/index.js

@@ -3,4 +3,5 @@ export * from './all';
 export * from './path';
 export * from './current';
 export * from './by-id';
+export * from './boolean';
 export * from './next-position';