Add Surat Keluar

migrations/000035_add_parent_department_id.down.sql

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+-- Drop the view
+DROP VIEW IF EXISTS department_hierarchy;
+
+-- Drop the functions
+DROP FUNCTION IF EXISTS get_department_hierarchy_path(UUID);
+DROP FUNCTION IF EXISTS check_department_hierarchy();
+
+-- Drop the trigger
+DROP TRIGGER IF EXISTS check_department_hierarchy_trigger ON departments;
+
+-- Drop the index
+DROP INDEX IF EXISTS idx_departments_parent_id;
+
+-- Remove the parent_department_id column
+ALTER TABLE departments DROP COLUMN IF EXISTS parent_department_id;

migrations/000035_add_parent_department_id.up.sql

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+-- 1) Schema changes
+ALTER TABLE departments
+    ADD COLUMN parent_department_id UUID REFERENCES departments(id) ON DELETE CASCADE;
+
+CREATE INDEX idx_departments_parent_id ON departments(parent_department_id);
+
+-- (Optional but recommended for ltree lookups)
+-- CREATE EXTENSION IF NOT EXISTS ltree;
+-- CREATE INDEX idx_departments_path_gist ON departments USING GIST (path);
+-- CREATE INDEX idx_departments_path_nlevel ON departments ((nlevel(path)));
+
+-- 2) Migrate parent ids from existing ltree path
+-- Use ltree helpers: nlevel() and subpath()
+UPDATE departments d1
+SET parent_department_id = d2.id
+    FROM departments d2
+WHERE nlevel(d1.path) > 1
+  AND d2.path = subpath(d1.path, 0, nlevel(d1.path) - 1);
+
+-- 3) Guard against cycles/self-parent via trigger
+CREATE OR REPLACE FUNCTION check_department_hierarchy()
+RETURNS TRIGGER AS $$
+DECLARE
+current_id UUID;
+    max_depth INT := 100;
+    depth INT := 0;
+BEGIN
+    IF NEW.parent_department_id IS NULL THEN
+        RETURN NEW;
+END IF;
+
+    -- self-reference
+    IF NEW.parent_department_id = NEW.id THEN
+        RAISE EXCEPTION 'Department cannot be its own parent';
+END IF;
+
+    -- walk up the tree
+    current_id := NEW.parent_department_id;
+    WHILE current_id IS NOT NULL AND depth < max_depth LOOP
+        IF current_id = NEW.id THEN
+            RAISE EXCEPTION 'Circular reference detected in department hierarchy';
+END IF;
+
+SELECT parent_department_id INTO current_id
+FROM departments
+WHERE id = current_id;
+
+depth := depth + 1;
+END LOOP;
+
+    IF depth >= max_depth THEN
+        RAISE EXCEPTION 'Department hierarchy too deep (max: %)', max_depth;
+END IF;
+
+RETURN NEW;
+END;
+$$ LANGUAGE plpgsql;
+
+DROP TRIGGER IF EXISTS check_department_hierarchy_trigger ON departments;
+
+CREATE TRIGGER check_department_hierarchy_trigger
+    BEFORE INSERT OR UPDATE OF parent_department_id ON departments
+    FOR EACH ROW
+    EXECUTE FUNCTION check_department_hierarchy();
+
+-- 4) Helper to rebuild dotted text path from codes (top.down.leaf)
+CREATE OR REPLACE FUNCTION get_department_hierarchy_path(dept_id UUID)
+RETURNS TEXT AS $$
+DECLARE
+path_text TEXT := '';
+    current_dept RECORD;
+    current_id UUID := dept_id;
+BEGIN
+    WHILE current_id IS NOT NULL LOOP
+SELECT id, name, parent_department_id, code
+INTO current_dept
+FROM departments
+WHERE id = current_id;
+
+IF current_dept IS NULL THEN
+            EXIT;
+END IF;
+
+        IF path_text = '' THEN
+            path_text := current_dept.code;
+ELSE
+            path_text := current_dept.code || '.' || path_text;
+END IF;
+
+        current_id := current_dept.parent_department_id;
+END LOOP;
+
+RETURN path_text;
+END;
+$$ LANGUAGE plpgsql;
+
+-- 5) View for easy hierarchy queries
+CREATE OR REPLACE VIEW department_hierarchy AS
+WITH RECURSIVE dept_tree AS (
+    -- roots
+    SELECT 
+        id,
+        name,
+        code,
+        parent_department_id,
+        path,
+        0  AS level,
+        ARRAY[id]   AS hierarchy_ids,
+        ARRAY[name] AS hierarchy_names
+    FROM departments
+    WHERE parent_department_id IS NULL
+
+    UNION ALL
+
+    -- children
+    SELECT 
+        d.id,
+        d.name,
+        d.code,
+        d.parent_department_id,
+        d.path,
+        dt.level + 1,
+        dt.hierarchy_ids   || d.id,
+        dt.hierarchy_names || d.name
+    FROM departments d
+    JOIN dept_tree dt ON d.parent_department_id = dt.id
+)
+SELECT * FROM dept_tree;