yourpart3/backend/models/trigger.js

import { sequelize } from '../utils/sequelize.js';

export async function createTriggers() {
    const createTriggerFunction = `
        CREATE OR REPLACE FUNCTION community.create_user_param_visibility_trigger()
        RETURNS TRIGGER AS $$
        BEGIN
            -- Check if UserParamVisibility already exists for this UserParam
            IF NOT EXISTS (
                SELECT 1 FROM community.user_param_visibility
                WHERE param_id = NEW.id
            ) THEN
                -- Insert the default visibility (Invisible)
                INSERT INTO community.user_param_visibility (param_id, visibility)
                VALUES (NEW.id, (
                    SELECT id FROM type.user_param_visibility WHERE description = 'Invisible'
                ));
            END IF;

            -- If NEW is null, then we have nothing to do
            IF NEW IS NULL THEN
                RETURN NULL;
            END IF;

            RETURN NEW;
        END;
        $$ LANGUAGE plpgsql;
    `;

    const createInsertTrigger = `
        CREATE OR REPLACE TRIGGER trigger_create_user_param_visibility
        AFTER INSERT ON community.user_param
        FOR EACH ROW
        WHEN (NEW.id IS NOT NULL)
        EXECUTE FUNCTION community.create_user_param_visibility_trigger();
    `;

    const createUpdateTrigger = `
        CREATE OR REPLACE TRIGGER trigger_update_user_param_visibility
        AFTER UPDATE ON community.user_param
        FOR EACH ROW
        WHEN (NEW.id IS NOT NULL)
        EXECUTE FUNCTION community.create_user_param_visibility_trigger();
    `;

    const createDiaryHistoryTriggerFunction = `
        CREATE OR REPLACE FUNCTION community.insert_diary_history()
        RETURNS TRIGGER AS $$
        BEGIN
            INSERT INTO community.diary_history (diary_id, user_id, old_text, old_created_at, old_updated_at)
            VALUES (OLD.id, OLD.user_id, OLD.text, OLD.created_at, OLD.updated_at);

            -- If NEW is null, then we have nothing to do
            IF NEW IS NULL THEN
                RETURN NULL;
            END IF;

            RETURN NEW;
        END;
        $$ LANGUAGE plpgsql;
    `;

    const createDiaryHistoryTrigger = `
        CREATE OR REPLACE TRIGGER diary_update_trigger
        BEFORE UPDATE ON community.diary
        FOR EACH ROW
        WHEN (OLD.id IS NOT NULL)
        EXECUTE FUNCTION community.insert_diary_history();
    `;

    const createTitleHistoryTriggerFunction = `
        CREATE OR REPLACE FUNCTION forum.insert_title_history()
        RETURNS TRIGGER AS $$
        BEGIN
            INSERT INTO forum.title_history (title_id, old_title, changed_by, old_updated_at)
            VALUES (OLD.id, OLD.title, OLD.created_by, OLD.updated_at);
            RETURN NEW;
        END;
        $$ LANGUAGE plpgsql;
    `;

    const createTitleHistoryTrigger = `
        CREATE OR REPLACE TRIGGER title_update_trigger
        BEFORE UPDATE ON forum.title
        FOR EACH ROW
        WHEN (OLD.id IS NOT NULL)
        EXECUTE FUNCTION forum.insert_title_history();
    `;

    const createCharacterCreationTriggerMethod = `
        CREATE OR REPLACE FUNCTION falukant_data.create_character_creation_trigger()
        RETURNS TRIGGER AS $$
        BEGIN
            INSERT INTO falukant_data.knowledge (product_id, character_id)
            SELECT id, NEW.id FROM falukant_type.product;
            RETURN NEW;
        END;
        $$ LANGUAGE plpgsql;
    `;

    const createCharacterCreationTrigger = `
        CREATE OR REPLACE TRIGGER character_creation_trigger
        AFTER INSERT ON falukant_data.character
        FOR EACH ROW
        WHEN (NEW.id IS NOT NULL)
        EXECUTE FUNCTION falukant_data.create_character_creation_trigger();
    `;

    const createKnowledgeTriggerMethod = `
        CREATE OR REPLACE FUNCTION falukant_data.create_knowledge_trigger()
        RETURNS TRIGGER AS $$
        BEGIN
            NEW.knowledge = random() * 61 + 20;
            RETURN NEW;
        END;
        $$ LANGUAGE plpgsql;
    `;

    const createKnowledgeTrigger = `
        CREATE OR REPLACE TRIGGER knowledge_trigger
        BEFORE INSERT ON falukant_data.knowledge
        FOR EACH ROW
        WHEN (NEW.id IS NOT NULL)
        EXECUTE FUNCTION falukant_data.create_knowledge_trigger();
    `;

    try {
        await sequelize.query(createTriggerFunction);
        await sequelize.query(createInsertTrigger);
        await sequelize.query(createUpdateTrigger);
        await sequelize.query(createDiaryHistoryTriggerFunction);
        await sequelize.query(createDiaryHistoryTrigger);
        await sequelize.query(createTitleHistoryTriggerFunction);
        await sequelize.query(createTitleHistoryTrigger);
        await sequelize.query(createCharacterCreationTriggerMethod);
        await sequelize.query(createCharacterCreationTrigger);
        await sequelize.query(createKnowledgeTriggerMethod);
        await sequelize.query(createKnowledgeTrigger);

        console.log('Triggers created successfully');
    } catch (error) {
        console.error('Error creating triggers:', error);
    }
}