Technology dependencies view

* Added SQL view that lists dependencies of technologies as
comma-separated lists of identifiers

legacyworlds-server-data/db-structure/parts/040-functions/026-technology-dependencies.sql

@@ -312,3 +312,26 @@ CREATE TRIGGER tg_techdeps_ai
 REVOKE EXECUTE
 	ON FUNCTION defs.tgf_techdeps_ai( )
 	FROM PUBLIC;
+
+
+/*
+ * Technology dependencies view
+ * -----------------------------
+ * 
+ * This view generates a parseable list of dependencies per technology.
+ * 
+ * Columns:
+ *		technology_name_id		The technology's name
+ *		technology_dependencies	A list of comma-separated technology name
+ *									identifiers
+ */
+DROP VIEW IF EXISTS defs.technology_dependencies_view CASCADE;
+CREATE VIEW defs.technology_dependencies_view
+	AS SELECT technology_name_id ,
+			array_to_string( array_agg( _name_str.name ) , ',' ) AS technology_dependencies
+		FROM defs.technologies _tech
+			LEFT OUTER JOIN defs.technology_dependencies
+				USING ( technology_name_id )
+			LEFT OUTER JOIN defs.strings _name_str
+				ON _name_str.id = technology_name_id_depends
+		GROUP BY technology_name_id;

legacyworlds-server-data/db-structure/tests/admin/040-functions/026-technology-dependencies/050-technology-dependencies-view.sql

@@ -0,0 +1,49 @@
+/*
+ * Unit tests for defs.technology_dependencies_view
+ */
+BEGIN;
+	\i utils/strings.sql
+	-- Make the columns we don't use in the technology definition table NULL-able
+	ALTER TABLE defs.technologies
+		ALTER technology_category_id DROP NOT NULL ,
+		ALTER technology_discovery_id DROP NOT NULL ,
+		ALTER technology_description_id DROP NOT NULL ,
+		ALTER technology_price DROP NOT NULL ,
+		ALTER technology_points DROP NOT NULL;
+
+	-- Create strings to use as the technologies' names
+	SELECT _create_test_strings( 4 , 'tech' );
+	
+	-- Insert the technologies
+	INSERT INTO defs.technologies ( technology_name_id )
+		VALUES ( _get_string( 'tech1' ) ) ,
+				( _get_string( 'tech2' ) ) ,
+				( _get_string( 'tech3' ) ) ,
+				( _get_string( 'tech4' ) );
+
+	-- Insert dependencies: tech3 -> {tech1,tech2} , tech4 -> {tech3}
+	INSERT INTO defs.technology_dependencies ( technology_name_id , technology_name_id_depends )
+		VALUES ( _get_string( 'tech3' ) , _get_string( 'tech1' ) ) ,
+			( _get_string( 'tech3' ) , _get_string( 'tech2' ) ) ,
+			( _get_string( 'tech4' ) , _get_string( 'tech3' ) );
+
+	-- ***** TESTS BEGIN HERE *****
+	SELECT plan( 3 );
+
+	SELECT diag_test_name( 'defs.technology_dependencies_view - Technologies with no dependencies' );
+	SELECT is( technology_dependencies , '' )
+		FROM defs.technology_dependencies_view
+		WHERE technology_name_id = _get_string( 'tech1' );
+
+	SELECT diag_test_name( 'defs.technology_dependencies_view - Technologies with a single dependency' );
+	SELECT is( technology_dependencies , 'tech3' )
+		FROM defs.technology_dependencies_view
+		WHERE technology_name_id = _get_string( 'tech4' );
+
+	SELECT diag_test_name( 'defs.technology_dependencies_view - Technologies with multiple dependencies' );
+	SELECT ok( technology_dependencies = 'tech1,tech2' OR technology_dependencies = 'tech2,tech1' )
+		FROM defs.technology_dependencies_view
+		WHERE technology_name_id = _get_string( 'tech3' );
+
+	SELECT * FROM finish( );
+ROLLBACK;

legacyworlds-server-data/db-structure/tests/user/040-functions/026-technology-dependencies/060-technology-dependencies-view.sql

@@ -0,0 +1,15 @@
+/*
+ * Test privileges on defs.technology_dependencies_view
+ */
+BEGIN;
+	\i utils/strings.sql
+
+	SELECT plan( 1 );
+
+	SELECT diag_test_name( 'defs.technology_dependencies_view - No SELECT privilege' );
+	SELECT throws_ok( $$
+		SELECT * FROM defs.technology_dependencies_view;
+	$$ , 42501 );
+
+	SELECT * FROM finish( );
+ROLLBACK;