Class: Yrby::Generators::TablesGenerator

Inherits:
Rails::Generators::Base
  • Object
show all
Includes:
ActiveRecord::Generators::Migration
Defined in:
lib/generators/yrby/tables/tables_generator.rb

Overview

bin/rails generate yrby:tables — the migration for the gem-owned document models (Y::Document + Y::DocumentUpdate). Invoked by yrby:install, and by other gems building on the same storage.

Template notes (kept here, not in the emitted migration): state is 4.gigabytes - 1 (longblob on MySQL — a compacted snapshot is the whole document; a 16 MB cap would break compaction) and payload is 16.megabytes - 1 (one update can carry a big paste or a client's accumulated offline edits — the 64 KB default blob is too small). The partial unique index's WHERE only keeps key-only rows out of the index: uniqueness holds without it, since unique indexes treat NULLs as distinct on every supported database, and MySQL drops the predicate harmlessly. y_document_updates indexes (document_id, pending) instead of bare document_id: the prefix serves the tail and foreign-key lookups, and the pair serves the clean-row count every append runs.

Instance Method Summary collapse

Instance Method Details

#create_migration_file ⇒ Object 



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# File 'lib/generators/yrby/tables/tables_generator.rb', line 29

def create_migration_file
  migration_template "create_y_tables.rb",
                     File.join(db_migrate_path, "create_y_tables.rb")
end