Implement return reasons model and distribution pipeline

[ricardotejedorsanz]

This PR implements the Ruby models and serialization layer for return reasons, integrating them into the existing taxonomy distribution pipeline. It also updates the category model to support return reasons. This enables both return reasons and categories (with their return reason mappings) to be published in distribution formats.

What's included:

1. Return Reason Model: ReturnReason Ruby class with validation, following the same patterns as Attribute and Category

   • Loads from data/return_reasons.yml
   • Validates uniqueness of IDs, names, handles, and friendly_ids
   • Provides lookup methods (find_by!, all)

2. Return Reason Distribution Serializers: Generate public-facing output files

   • json_serializer.rb: Creates dist/en/return_reasons.json with GIDs, names, handles, descriptions
   • txt_serializer.rb: Creates dist/en/return_reasons.txt in human-readable format

3. Return Reason Data Serializers: Internal data management

   • data_serializer.rb: Exports to YAML format for data dumps
   • localizations_serializer.rb: Syncs English localizations from data files

4. Category Model Updates: Enhanced to load and validate return_reasons from YAML

   • category.rb: Loads return_reasons field, returns ReturnReason objects
   • Validates all referenced return reasons exist

5. Category Serializer Updates: Include return reasons in distribution outputs

   • category/data/data_serializer.rb: Ensures all categories have return_reasons: [] field (even if empty)
   • category/dist/json_serializer.rb: Includes return reasons in categories.json and taxonomy.json

6. Pipeline Integration: Updates generate_dist_command.rb to include return reasons in the build process

Design decisions:

• GID format: gid://shopify/ReturnReasonDefinition/{id} (see PR 1 for GID naming discussion and rationale)
• Mirrored serializer structure from attributes for consistency
• Alphabetical sorting with special handling: "Unknown" second-to-last, "Other" last
• Distribution files follow existing taxonomy patterns (JSON + TXT formats)

Generated outputs:

• dist/en/return_reasons.json: 359 return reasons with full metadata
• dist/en/return_reasons.txt: Simple GID : Name format for quick reference
• dist/en/categories.json: Now includes return_reasons array for each category
• dist/en/taxonomy.json: Regenerated with updated categories

Review notes:

• Return reason model validation mirrors Attribute validation patterns
• Category model changes enable loading return_reasons from YAML (added in PR 1)
• Serializers are structured to support future multi-locale expansion
• Changes to dev/lib/product_taxonomy.rb add necessary requires for new classes
• This PR enables bundle exec ./bin/product_taxonomy dist to generate return reasons files
• Large dist files (categories.json, taxonomy.json) are regenerated with return reasons included
• Test coverage: Unit tests for models and serializers will be added in follow-up PRs

Files to Include

• dev/lib/product_taxonomy/models/return_reason.rb
• dev/lib/product_taxonomy/models/serializers/return_reason/dist/json_serializer.rb
• dev/lib/product_taxonomy/models/serializers/return_reason/dist/txt_serializer.rb
• dev/lib/product_taxonomy/models/serializers/return_reason/data/data_serializer.rb
• dev/lib/product_taxonomy/models/serializers/return_reason/data/localizations_serializer.rb
• dev/lib/product_taxonomy/models/category.rb (changes to support return_reasons)
• dev/lib/product_taxonomy/models/serializers/category/data/data_serializer.rb (ensures return_reasons field in YAML)
• dev/lib/product_taxonomy/models/serializers/category/dist/json_serializer.rb (includes return_reasons in output)
• dev/lib/product_taxonomy/commands/generate_dist_command.rb
• dev/lib/product_taxonomy.rb (changes to load return reasons)
• dist/en/return_reasons.json
• dist/en/return_reasons.txt
• dist/en/categories.json (regenerated with return_reasons)
• dist/en/taxonomy.json (regenerated with return_reasons)

Dependencies

• PR 1 (requires data files)

Review Focus

• Return reason implementation: Model, validation, and serializers
• Category model enhancements: Loading and validating return_reasons from YAML
• Distribution integration: Both new files (return_reasons.*) and updated files (categories.json, taxonomy.json)
• Pipeline integration: Updates to generate_dist command
• Regenerated files: Large JSON files expected (categories.json, taxonomy.json)

[ricardotejedorsanz]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
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• Implement return reasons model and distribution pipeline #790 : 2 dependent PRs (#792 , #795 ) 👈 (View in Graphite)
• Add return reasons data and category mappings #789
• main

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[jmignac]

Added some comments - on top of missing unit tests