A specialized architectural tool for selecting the optimal database persistence strategy for object-oriented inheritance hierarchies.
Install & Download
1. ClawHub CLI
The fastest way to install a skill directly from the registry.
npx clawhub@latest install bookforge-inheritance-mapping-selector
2. Manual Installation
Copy the skill folder to one of these locations
~/.openclaw/skills/ <project>/skills/ Priority: Workspace > Local > Bundled
3. Prompt Installation
Copy this prompt to OpenClaw to install it automatically.
Help me install bookforge-inheritance-mapping-selector using Clawhub. If Clawhub is not installed, install it first (npm i -g clawhub).
Prefer to download?
Get the raw skill files in a ZIP archive.
What is Inheritance Mapping Selector?
The Inheritance Mapping Selector is a technical framework designed to bridge the gap between object-oriented programming and relational database design. Based on the foundational patterns defined by Martin Fowler, this Openclaw Skills asset helps developers choose between Single Table Inheritance (STI), Class Table Inheritance (CTI), and Concrete Table Inheritance. It provides a structured approach to mapping class trees into database tables, ensuring that architectural decisions are backed by data regarding polymorphic performance and schema integrity.
By utilizing this skill, engineering teams can avoid common pitfalls such as excessive null values in wide tables or performance degradation caused by complex multi-table joins. It translates high-level architectural decisions into concrete ORM configurations for popular frameworks like Hibernate, Rails, Django, and SQLAlchemy, making it an essential tool for greenfield schema design or legacy system refactoring.
Inheritance Mapping Selector Use Cases
- Designing a new database schema for a complex domain model with deep inheritance trees.
- Configuring JPA or Hibernate @Inheritance strategies to optimize application performance.
- Refactoring wide, sparse tables where Single Table Inheritance has led to poor data density.
- Improving polymorphic query speeds in systems suffering from excessive JOIN operations.
- Documenting formal Architecture Decision Records (ADRs) for persistence layer strategies in Openclaw Skills projects.
How Inheritance Mapping Selector Works
- Hierarchy Mapping: The skill starts by identifying all abstract and concrete classes, analyzing tree depth, and mapping where specific fields are clustered.
- Trade-off Analysis: It evaluates the requirements against six critical dimensions: join frequency, wasted space, FK enforcement, readability, refactoring flexibility, and polymorphism cost.
- Primary Routing: Based on the scoring, it selects a primary strategy (STI, CTI, or Concrete) that aligns with the dominant technical needs of the project.
- Mixing Assessment: It determines if different branches of the hierarchy require divergent strategies, recommending the Inheritance Mappers pattern if necessary.
- ORM Mapping: The selected strategy is translated into framework-specific code snippets and configuration properties.
- Documentation Generation: The process concludes with a full Inheritance Mapping Decision Record, including SQL sketches and migration paths.
Inheritance Mapping Selector Setup
To integrate this skill into your workflow via the CLI tools, use the following commands:
# Install the skill from the central repository
clawhub install bookforge-inheritance-mapping-selector
# Run the selector within your agent environment
openclaw run inheritance-mapping-selector --input hierarchy_description.md
Inheritance Mapping Selector Data Schema & Taxonomy
The skill organizes its analysis and recommendations using a structured taxonomy to ensure clarity in Openclaw Skills implementations:
| Data Component | Description |
|---|---|
| Hierarchy Metadata | Taxonomy of abstract vs. concrete classes and field distribution. |
| Trade-off Matrix | A comparison table scoring STI, CTI, and Concrete strategies across 6 dimensions. |
| SQL Sketch | Simplified DDL (CREATE TABLE) statements illustrating the recommended schema. |
| ORM Snippets | Language-specific configuration (e.g., Java/JPA, Python/Django, Ruby/Rails). |
| Migration Logic | Step-by-step instructions for transitioning from current to target state. |
Inheritance Mapping Selector Advanced Features
- Multi-Strategy Mixing: Supports the Inheritance Mappers pattern to allow different persistence strategies within a single class hierarchy.
- ORM Idiom Translation: Automatically maps architectural decisions to the specific syntax of Hibernate, Django, SQLAlchemy, Rails, and Doctrine.
- Cross-Table Key Coordination: Provides strategies for maintaining ID uniqueness across Concrete Table Inheritance implementations using UUIDs or shared sequences.
- Polymorphic Query Optimization: Identifies when to use UNION ALL versus JOIN based on read-frequency estimates provided in the input.
SKILL.md
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