From bb74b451d60327727dfa1a262f4229966fb93b8c Mon Sep 17 00:00:00 2001
From: tomit4 <mosssap@gmail.com>
Date: Fri, 3 Sep 2021 04:23:25 -0700
Subject: [PATCH] notes on database relations

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 db_relations_notes.txt | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)
 create mode 100644 db_relations_notes.txt

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+# Taken from Tom Nurkkala's Youtube Video on Object-RElational Mapping, which uses KnexJS and ObjectionJS to demonstrate
+# Basic SQL relationships
+
+Models in relation
+    source: model containing relationMappings definition
+    related: model at other end of relation
+
+Relation        Attribute                   FK(s) in
+One-toMany      BelongsToOneRelation        Source
+                HasManyRelation             Related
+
+Many-to-Many    ManyToManyRelation          Source
+
+One-to-One      BelongsToOneRelation        Source
+                HasOneRelation              Related
+                HasOneThroughRelation       Join table
+
+See video at around 48:00 for further details.
+Also look up Database Relations and also ObjectionJS docs for further details on each one.