review the internal schema to allow to create schema without identifier; fix #513

meilisearch-core/src/database.rs

@@ -8,6 +8,7 @@ use crossbeam_channel::{Receiver, Sender};
 use heed::types::{Str, Unit};
 use heed::{CompactionOption, Result as ZResult};
 use log::debug;
+use meilisearch_schema::Schema;
 
 use crate::{store, update, Index, MResult};
 
@@ -242,6 +243,7 @@ impl Database {
                 index.main.put_name(&mut writer, name)?;
                 index.main.put_created_at(&mut writer)?;
                 index.main.put_updated_at(&mut writer)?;
+                index.main.put_schema(&mut writer, &Schema::new())?;
 
                 let env_clone = self.env.clone();
                 let update_env_clone = self.update_env.clone();

meilisearch-core/src/update/documents_addition.rs

@@ -115,7 +115,7 @@ pub fn apply_documents_addition<'a, 'b>(
         None => return Err(Error::SchemaMissing),
     };
 
-    let identifier = schema.identifier();
+    let identifier = schema.identifier().ok_or(Error::MissingIdentifier)?;
 
     // 1. store documents ids for future deletion
     for document in addition {
@@ -184,7 +184,7 @@ pub fn apply_documents_partial_addition<'a, 'b>(
         None => return Err(Error::SchemaMissing),
     };
 
-    let identifier = schema.identifier();
+    let identifier = schema.identifier().ok_or(Error::MissingIdentifier)?;
 
     // 1. store documents ids for future deletion
     for mut document in addition {

meilisearch-core/src/update/documents_deletion.rs

@@ -40,7 +40,7 @@ impl DocumentsDeletion {
     where
         D: serde::Serialize,
     {
-        let identifier = schema.identifier();
+        let identifier = schema.identifier().ok_or(Error::MissingIdentifier)?;
         let document_id = match extract_document_id(&identifier, &document)? {
             Some(id) => id,
             None => return Err(Error::MissingDocumentId),