Class: Pcrd::Readiness::Manifest

Inherits:
Object
  • Object
show all
Defined in:
lib/pcrd/readiness/manifest.rb

Overview

Builds the target-readiness manifest: for each migrated table, which secondary objects exist on the source, whether the target already has them, and runnable DDL to create the missing ones before cutover.

The load DDL (Schema::DDL) creates only table + primary key; indexes, constraints, grants, etc. are deferred so the bulk load is fast. This turns that deferral from tribal knowledge into an explicit checklist.

Rename/drop aware: an object referencing a dropped column is reported as not-recreatable; one referencing a renamed column is flagged for manual regeneration (its source DDL is shown commented out) rather than emitting silently-wrong SQL.

Sequences/identity are reported as informational — they are restored automatically by ‘pcrd cutover` (Cutover::Sequences), so the manifest does not emit competing DDL for them.

Defined Under Namespace

Classes: Entry, Result, Table

Constant Summary collapse

KIND_LABEL = 
{ "f" => "foreign key", "u" => "unique constraint", "c" => "check constraint" }.freeze

Instance Method Summary collapse

Constructor Details

#initialize(source_pool:, target_pool:, config:) ⇒ Manifest

Returns a new instance of Manifest.



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# File 'lib/pcrd/readiness/manifest.rb', line 31

def initialize(source_pool:, target_pool:, config:)
  @source = source_pool
  @target = target_pool
  @config = config
end

Instance Method Details

#build ⇒ Object 



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# File 'lib/pcrd/readiness/manifest.rb', line 37

def build
  src = Schema::ObjectReader.new(@source)
  tgt = Schema::ObjectReader.new(@target)

  tables = (@config.migrate&.tables || []).map do |table_config|
    Table.new(table_name: table_config.name, entries: entries_for(table_config, src, tgt))
  end

  Result.new(tables: tables)
end