Metadata Docs added

Author: sfxcode

src/main/paradox/dao/gridfs_dao.md

@@ -3,6 +3,7 @@
 ## Info
 
 GridFSDAO adds MongoDB [GridFS](https://docs.mongodb.com/manual/core/gridfs/) support.
+
 It provides easy upload, download and metadata handling.
 
 Sometimes also normal collections can be helpful for storing data.

src/main/paradox/gridfs/crud.md

@@ -2,9 +2,10 @@
 
 ## Create
 
-You need a fiename, an input stream and some kind of meatadata.
+You need a filename, an input stream and some kind of metadata.
 
 Possible Metadata types:
+
 * Document
 * Map
 * Scala Case Class
@@ -28,6 +29,7 @@ Do not use GridFS if you need to update the content of the entire file atomicall
 GridFSFile will be deleted by a given ObjectID.
 
 With implicit conversion you can use for oid Parameter:
+
 * ObjectID
 * GridFSFile
 * String

src/main/paradox/gridfs/metadata.md

@@ -0,0 +1,32 @@
+# GridFSDAO - Metadata
+
+Metadata can be updated by the GridFSDAO.
+
+## Update complete Metadata
+
+UpdateMetadata function will replace the whole metadata for one file.
+
+```scala
+
+val value = Map("index"->11, "category"->"templates")
+ImageFilesDAO.updateMetadata(oid, value)
+
+```
+
+## Update Metadata elements
+
+UpdateMetadataElement/s update some part of the metadata by a given filter.
+
+
+```scala
+
+ val elements =  Map("category"->"logos")
+ val filter = Map() // all files
+ ImageFilesDAO.updateMetadataElements(filter, elements)
+
+
+```
+
+
+
+

src/main/paradox/index.md

@@ -48,6 +48,7 @@ libraryDependencies += "com.sfxcode.nosql" %% "simple-mongo" % $app-version$
  - [MongoDAO Search](dao/search.md)
  - [GridFSDAO](dao/gridfs_dao.md)
  - [GridFSDAO CRUD](gridfs/crud.md)
+ - [GridFSDAO Metadata](gridfs/metadata.md)
  - [Feature Aggregation](features/aggregation.md)
  - [Feature Relationships](features/relationships.md)
  - [Feature Observable](features/observable.md)