diff options
Diffstat (limited to 'app/models/internal_id.rb')
| -rw-r--r-- | app/models/internal_id.rb | 20 |
1 files changed, 18 insertions, 2 deletions
diff --git a/app/models/internal_id.rb b/app/models/internal_id.rb index 4673dffa842..6419cdc5b67 100644 --- a/app/models/internal_id.rb +++ b/app/models/internal_id.rb @@ -17,6 +17,8 @@ class InternalId < ActiveRecord::Base validates :usage, presence: true + REQUIRED_SCHEMA_VERSION = 20180305095250 + # Increments #last_value and saves the record # # The operation locks the record and gathers a `ROW SHARE` lock (in PostgreSQL). @@ -30,8 +32,22 @@ class InternalId < ActiveRecord::Base class << self def generate_next(subject, scope, usage, init) + # Shortcut if `internal_ids` table is not available (yet) + # This can be the case in other (unrelated) migration specs + return (init.call(subject) || 0) + 1 unless available? + InternalIdGenerator.new(subject, scope, usage, init).generate end + + def available? + @available_flag ||= ActiveRecord::Migrator.current_version >= REQUIRED_SCHEMA_VERSION # rubocop:disable Gitlab/PredicateMemoization + end + + # Flushes cached information about schema + def reset_column_information + @available_flag = nil + super + end end class InternalIdGenerator @@ -49,12 +65,12 @@ class InternalId < ActiveRecord::Base # subject: The instance we're generating an internal id for. Gets passed to init if called. # scope: Attributes that define the scope for id generation. # usage: Symbol to define the usage of the internal id, see InternalId.usages - # init: Block that gets called to initialize InternalId record if not yet present (optional) + # init: Block that gets called to initialize InternalId record if not present attr_reader :subject, :scope, :init, :scope_attrs, :usage def initialize(subject, scope, usage, init) @subject = subject @scope = scope - @init = init || ->(s) { 0 } + @init = init @usage = usage raise 'scope is not well-defined, need at least one column for scope (given: 0)' if scope.empty? |