reorg: separate db::records from insertable models

kordophone-db/src/models/db/participant.rs

@@ -0,0 +1,37 @@
+use diesel::prelude::*;
+use crate::models::Participant;
+use crate::schema::conversation_participants;
+
+#[derive(Queryable, Selectable, AsChangeset, Clone, PartialEq, Debug, Identifiable)]
+#[diesel(table_name = crate::schema::participants)]
+pub struct Record {
+    pub id: i32,
+    pub display_name: String
+}
+
+#[derive(Identifiable, Selectable, Queryable, Associations, Debug)]
+#[diesel(belongs_to(super::conversation::Record, foreign_key = conversation_id))]
+#[diesel(belongs_to(Record, foreign_key = participant_id))]
+#[diesel(table_name = conversation_participants)]
+#[diesel(primary_key(conversation_id, participant_id))]
+pub struct ConversationParticipant {
+    pub conversation_id: String,
+    pub participant_id: i32,
+}
+
+impl From<Record> for Participant {
+    fn from(record: Record) -> Self {
+        Participant { 
+            display_name: record.display_name 
+        }
+    }
+}
+
+impl From<Participant> for Record {
+    fn from(participant: Participant) -> Self {
+        Record {
+            id: 0, // This will be set by the database
+            display_name: participant.display_name,
+        }
+    }
+}