{"ID", "Thing", "ThingID", "likes", "", false},
			},
		},
		Relation{
			Name: "Dislikes", Type: schema.Many2Many, Schema: "Person", FieldSchema: "Thing",
			JoinTable: JoinTable{Name: "dislikes", Table: "dislikes"},
			References: []Reference{
				{"ID", "Person", "PersonID", "dislikes", "", true},
				{"ID", "Thing", "ThingID", "dislikes", "", false},
			},
		},
	)
}

{* ../../docs_src/body_nested_models/tutorial002_py310.py hl[12] *}

## Set types { #set-types }

But then we think about it, and realize that tags shouldn't repeat, they would probably be unique strings.

And Python has a special data type for sets of unique items, the `set`.

Then we can declare `tags` as a set of strings:

        new ActivationOS().equals(new ActivationOS());
    }

    @Test
    void testEqualsIdentity() {
        ActivationOS thing = new ActivationOS();
        assertTrue(thing.equals(thing), "Expected " + thing + " to equal " + thing);
    }

    @Test
    void testToStringNullSafe() {
        assertNotNull(new ActivationOS().toString());
    }

        new PluginConfiguration().equals(new PluginConfiguration());
    }

    @Test
    void testEqualsIdentity() {
        PluginConfiguration thing = new PluginConfiguration();
        assertTrue(thing.equals(thing), "Expected " + thing + " to equal " + thing);
    }

    @Test
    void testToStringNullSafe() {
        assertNotNull(new PluginConfiguration().toString());
    }

        new ReportPlugin().equals(new ReportPlugin());
    }

    @Test
    void testEqualsIdentity() {
        ReportPlugin thing = new ReportPlugin();
        assertTrue(thing.equals(thing), "Expected " + thing + " to equal " + thing);
    }

    @Test
    void testToStringNullSafe() {
        assertNotNull(new ReportPlugin().toString());
    }

        new Reporting().equals(new Reporting());
    }

    @Test
    void testEqualsIdentity() {
        Reporting thing = new Reporting();
        assertTrue(thing.equals(thing), "Expected " + thing + " to equal " + thing);
    }

    @Test
    void testToStringNullSafe() {
        assertNotNull(new Reporting().toString());
    }

        new Relocation().equals(new Relocation());
    }

    @Test
    void testEqualsIdentity() {
        Relocation thing = new Relocation();
        assertTrue(thing.equals(thing), "Expected " + thing + " to equal " + thing);
    }

    @Test
    void testToStringNullSafe() {
        assertNotNull(new Relocation().toString());
    }

        new Contributor().equals(new Contributor());
    }

    @Test
    void testEqualsIdentity() {
        Contributor thing = new Contributor();
        assertTrue(thing.equals(thing), "Expected " + thing + " to equal " + thing);
    }

    @Test
    void testToStringNullSafe() {
        assertNotNull(new Contributor().toString());
    }

        new Extension().equals(new Extension());
    }

    @Test
    void testEqualsIdentity() {
        Extension thing = new Extension();
        assertTrue(thing.equals(thing), "Expected " + thing + " to equal " + thing);
    }

    @Test
    void testToStringNullSafe() {
        assertNotNull(new Extension().toString());
    }

        new PluginContainer().equals(new PluginContainer());
    }

    @Test
    void testEqualsIdentity() {
        PluginContainer thing = new PluginContainer();
        assertTrue(thing.equals(thing), "Expected " + thing + " to equal " + thing);
    }

    @Test
    void testToStringNullSafe() {
        assertNotNull(new PluginContainer().toString());
    }