Class: Code0::ZeroTrack::Database::SchemaCleaner

Inherits:
Object
  • Object
show all
Defined in:
lib/code0/zero_track/database/schema_cleaner.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(original_schema) ⇒ SchemaCleaner

Returns a new instance of SchemaCleaner.



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# File 'lib/code0/zero_track/database/schema_cleaner.rb', line 16

def initialize(original_schema)
  @original_schema = original_schema
end

Instance Attribute Details

#original_schema ⇒ Object (readonly)

Returns the value of attribute original_schema.



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# File 'lib/code0/zero_track/database/schema_cleaner.rb', line 14

def original_schema
  @original_schema
end

Instance Method Details

#clean(io) ⇒ Object 



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# File 'lib/code0/zero_track/database/schema_cleaner.rb', line 20

def clean(io)
  structure = original_schema.dup

  # Remove noise
  structure.gsub!(/^COMMENT ON EXTENSION.*/, '')
  structure.gsub!(/^SET.+/, '')
  structure.gsub!(/^SELECT pg_catalog\.set_config\('search_path'.+/, '')
  structure.gsub!(/^--.*/, "\n")

  # We typically don't assume we're working with the public schema.
  # pg_dump uses fully qualified object names though, since we have multiple schemas
  # in the database.
  #
  # The intention here is to not introduce an assumption about the standard schema,
  # unless we have a good reason to do so.
  structure.gsub!(/public\.(\w+)/, '\1')
  structure.gsub!(
    /CREATE EXTENSION IF NOT EXISTS (\w+) WITH SCHEMA public;/,
    'CREATE EXTENSION IF NOT EXISTS \1;'
  )

  # Remove dynamic partition objects that are managed automatically at runtime.
  # These would cause schema drift on every partition rotation if left in the dump.
  remove_dynamic_partitions!(structure)

  structure.gsub!(/\n{3,}/, "\n\n")

  io << structure.strip
  io << "\n"

  nil
end