Add migration to store frequencies in database

client/metadata.js

@@ -80,9 +80,7 @@ Template.metadata.helpers({
   },
   rank() {
     const glyph = Session.get('editor.glyph');
-    if (!glyph) return '?';
+    return (glyph && glyph.metadata.frequency) || '?';
-    const data = cjklib.getCharacterData(glyph.character);
-    return data.frequency || '?';
   },
   references() {
     const glyph = Session.get('editor.glyph');

lib/glyphs.js

@@ -7,7 +7,10 @@ const defaultGlyph = (character) => {
   return {
     character: character,
     codepoint: character.codePointAt(0),
-    metadata: {kangxi_index: data.kangxi_index},
+    metadata: {
+      frequency: data.frequency,
+      kangxi_index: data.kangxi_index,
+    },
     stages: {},
   }
 }

server/migration.js

@@ -1,5 +1,11 @@
 "use strict";
 
+const addFrequencyField = (glyph) => {
+  const data = cjklib.getCharacterData(glyph.character);
+  glyph.metadata.frequency = data.frequency;
+  Glyphs.save(glyph);
+}
+
 const checkStrokeExtractorStability = (glyph) => {
   const strokes = stroke_extractor.getStrokes(
       glyph.stages.path, glyph.stages.bridges);
@@ -36,6 +42,7 @@ const migrateOldGlyphSchemaToNew = (glyph) => {
     codepoint: codepoint,
     metadata: {
       definition: undefined,
+      frequency: data.frequency,
       kangxi_index: data.kangxi_index,
       pinyin: undefined,
       strokes: undefined,