feat(index-fields): allow defining own field schema for index files

Author: demshy

packages/decap-cms-core/index.d.ts

@@ -323,6 +323,7 @@ declare module 'decap-cms-core' {
 
     frontmatter_delimiter?: string[] | string;
     fields?: CmsField[];
+    index_fields?: CmsField[];
     filter?: { field: string; value: any };
     path?: string;
     media_folder?: string;

packages/decap-cms-core/src/constants/configSchema.js

@@ -242,6 +242,7 @@ function getConfigSchema() {
               },
             },
             fields: fieldsConfig(),
+            index_fields: fieldsConfig(),
             sortable_fields: {
               type: 'array',
               items: {

packages/decap-cms-core/src/reducers/collections.ts

@@ -43,6 +43,13 @@ function collections(state = defaultState, action: ConfigAction) {
   }
 }
 
+function isIndexFile(filePath: string) {
+  const fileSlug = filePath?.split('/').pop();
+  const indexFiles = Set(['_index', 'index']);
+
+  return fileSlug && indexFiles.has(fileSlug);
+}
+
 const selectors = {
   [FOLDER]: {
     entryExtension(collection: Collection) {
@@ -55,7 +62,10 @@ const selectors = {
 
       return ext.replace(/^\./, '');
     },
-    fields(collection: Collection) {
+    fields(collection: Collection, slug: string) {
+      if (collection.get('index_fields') && isIndexFile(slug)) {
+        return collection.get('index_fields');
+      }
       return collection.get('fields');
     },
     entryPath(collection: Collection, slug: string) {

packages/decap-cms-core/src/types/redux.ts

@@ -607,6 +607,7 @@ type CollectionObject = {
   folder?: string;
   files?: CollectionFiles;
   fields: EntryFields;
+  index_fields?: EntryFields;
   isFetching: boolean;
   media_folder?: string;
   public_folder?: string;