fix: single query methods should be exact by default (#1756)

src/core/queryCache.ts

@@ -109,6 +109,11 @@ export class QueryCache extends Subscribable<QueryCacheListener> {
     arg2?: QueryFilters
   ): Query<TQueryFnData, TError, TData> | undefined {
     const [filters] = parseFilterArgs(arg1, arg2)
+
+    if (typeof filters.exact === 'undefined') {
+      filters.exact = true
+    }
+
     return this.queries.find(query => matchQuery(filters, query))
   }
 

src/core/tests/queryClient.test.tsx

@@ -153,6 +153,25 @@ describe('queryClient', () => {
     })
   })
 
+  describe('getQueryData', () => {
+    test('should return the query data if the query is found', () => {
+      const key = queryKey()
+      queryClient.setQueryData([key, 'id'], 'bar')
+      expect(queryClient.getQueryData([key, 'id'])).toBe('bar')
+    })
+
+    test('should return undefined if the query is not found', () => {
+      const key = queryKey()
+      expect(queryClient.getQueryData(key)).toBeUndefined()
+    })
+
+    test('should match exact by default', () => {
+      const key = queryKey()
+      queryClient.setQueryData([key, 'id'], 'bar')
+      expect(queryClient.getQueryData([key])).toBeUndefined()
+    })
+  })
+
   describe('fetchQuery', () => {
     // https://github.com/tannerlinsley/react-query/issues/652
     test('should not retry by default', async () => {