Update Work Package subject using a Type defined blueprint

app/models/type.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 #-- copyright
 # OpenProject is an open source project management software.
 # Copyright (C) the OpenProject GmbH
@@ -34,10 +36,12 @@ class Type < ApplicationRecord
 
   include ::Scopes::Scoped
 
-  attribute :patterns, Types::PatternCollectionType.new
+  attribute :patterns, Types::Patterns::CollectionType.new
 
   before_destroy :check_integrity
 
+  belongs_to :color, optional: true, class_name: "Color"
+
   has_many :work_packages
   has_many :workflows, dependent: :delete_all do
     def copy_from_type(source_type)
@@ -52,21 +56,19 @@ def copy_from_type(source_type)
                           join_table: "#{table_name_prefix}custom_fields_types#{table_name_suffix}",
                           association_foreign_key: "custom_field_id"
 
-  belongs_to :color, optional: true, class_name: "Color"
-
   acts_as_list
 
   validates :name, presence: true, uniqueness: { case_sensitive: false }, length: { maximum: 255 }
-
   validates :is_default, :is_milestone, inclusion: { in: [true, false] }
 
   scopes :milestone
 
   default_scope { order("position ASC") }
 
   scope :without_standard, -> { where(is_standard: false).order(:position) }
+  scope :default, -> { where(is_default: true) }
 
-  def to_s; name end
+  delegate :to_s, to: :name
 
   def <=>(other)
     name <=> other.name
@@ -81,36 +83,45 @@ def self.statuses(types)
   end
 
   def self.standard_type
-    ::Type.where(is_standard: true).first
-  end
-
-  def self.default
-    ::Type.where(is_default: true)
+    where(is_standard: true).first
   end
 
   def self.enabled_in(project)
-    ::Type.includes(:projects).where(projects: { id: project })
+    includes(:projects).where(projects: { id: project })
   end
 
   def statuses(include_default: false)
     if new_record?
       Status.none
     elsif include_default
-      ::Type
-        .statuses([id])
-        .or(Status.where_default)
+      self.class.statuses([id]).or(Status.where_default)
     else
-      ::Type.statuses([id])
+      self.class.statuses([id])
     end
   end
 
   def enabled_in?(object)
     object.types.include?(self)
   end
 
+  def replacement_patterns_defined?
+    return false if patterns.blank?
+
+    patterns.all_enabled.any?
+  end
+
+  def enabled_patterns
+    return {} if patterns.blank?
+
+    patterns.all_enabled
+  end
+
   private
 
   def check_integrity
-    raise "Can't delete type" if WorkPackage.where(type_id: id).any?
+    throw :abort if is_standard?
+    throw :abort if WorkPackage.exists?(type_id: id)
+
+    true
   end
 end

app/models/types/pattern.rb

@@ -30,9 +30,10 @@
 
 module Types
   Pattern = Data.define(:blueprint, :enabled) do
-    def call(object)
-      # calculate string using object
-      blueprint.to_s + object.to_s
+    def enabled? = !!enabled
+
+    def resolve(work_package)
+      PatternResolver.new(blueprint).resolve(work_package)
     end
 
     def to_h

app/models/types/pattern_resolver.rb

@@ -0,0 +1,71 @@
+# frozen_string_literal: true
+
+#-- copyright
+# OpenProject is an open source project management software.
+# Copyright (C) the OpenProject GmbH
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License version 3.
+#
+# OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
+# Copyright (C) 2006-2013 Jean-Philippe Lang
+# Copyright (C) 2010-2013 the ChiliProject Team
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+#
+# See COPYRIGHT and LICENSE files for more details.
+#++
+
+module Types
+  class PatternResolver
+    TOKEN_REGEX = /{{[0-9A-Za-z_]+}}/
+    private_constant :TOKEN_REGEX
+
+    def initialize(pattern)
+      @mapper = Patterns::TokenPropertyMapper.new
+      @pattern = pattern
+      @tokens = pattern.scan(TOKEN_REGEX).map { |token| Patterns::Token.build(token) }
+    end
+
+    def resolve(work_package)
+      @tokens.inject(@pattern) do |pattern, token|
+        pattern.gsub(token.pattern, get_value(work_package, token))
+      end
+    end
+
+    private
+
+    def get_value(work_package, token)
+      context = if token.context == :work_package
+                  work_package
+                else
+                  work_package.public_send(token.context)
+                end
+
+      stringify(@mapper[token.key].call(context))
+    end
+
+    def stringify(value)
+      case value
+      when Date, Time, DateTime
+        value.strftime("%Y-%m-%d")
+      when NilClass
+        "N/A"
+      else
+        value.to_s
+      end
+    end
+  end
+end

app/models/types/patterns/collection.rb

@@ -0,0 +1,59 @@
+# frozen_string_literal: true
+
+#-- copyright
+# OpenProject is an open source project management software.
+# Copyright (C) the OpenProject GmbH
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License version 3.
+#
+# OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
+# Copyright (C) 2006-2013 Jean-Philippe Lang
+# Copyright (C) 2010-2013 the ChiliProject Team
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+#
+# See COPYRIGHT and LICENSE files for more details.
+#++
+
+module Types
+  module Patterns
+    Collection = Data.define(:patterns) do
+      private_class_method :new
+
+      def self.build(patterns:, contract: CollectionContract.new)
+        contract.call(patterns).to_monad.fmap { |success| new(success.to_h) }
+      end
+
+      def initialize(patterns:)
+        transformed = patterns.transform_values { Pattern.new(**_1) }.freeze
+
+        super(patterns: transformed)
+      end
+
+      def all_enabled
+        patterns.select { |_, pattern| pattern.enabled? }
+      end
+
+      def [](value)
+        patterns.fetch(value)
+      end
+
+      def to_h
+        patterns.stringify_keys.transform_values(&:to_h)
+      end
+    end
+  end
+end

app/models/types/pattern_collection_contract.rb → app/models/types/patterns/collection_contract.rb

@@ -29,11 +29,13 @@
 #++
 
 module Types
-  class PatternCollectionContract < Dry::Validation::Contract
-    params do
-      required(:subject).hash do
-        required(:blueprint).filled(:string)
-        required(:enabled).filled(:bool)
+  module Patterns
+    class CollectionContract < Dry::Validation::Contract
+      params do
+        required(:subject).hash do
+          required(:blueprint).filled(:string)
+          required(:enabled).filled(:bool)
+        end
       end
     end
   end

app/models/types/pattern_collection.rb → app/models/types/patterns/collection_type.rb

@@ -29,25 +29,28 @@
 #++
 
 module Types
-  PatternCollection = Data.define(:patterns) do
-    private_class_method :new
+  module Patterns
+    class CollectionType < ActiveModel::Type::Value
+      def assert_valid_value(value)
+        cast(value)
+      end
 
-    def self.build(patterns:, contract: PatternCollectionContract.new)
-      contract.call(patterns).to_monad.fmap { |success| new(success.to_h) }
-    end
+      def cast(value)
+        Collection.build(patterns: value).value_or { nil }
+      end
 
-    def initialize(patterns:)
-      transformed = patterns.transform_values { Pattern.new(**_1) }.freeze
+      def serialize(pattern)
+        return super if pattern.nil?
 
-      super(patterns: transformed)
-    end
+        YAML.dump(pattern.to_h)
+      end
 
-    def [](value)
-      patterns.fetch(value)
-    end
+      def deserialize(value)
+        return if value.blank?
 
-    def to_h
-      patterns.stringify_keys.transform_values(&:to_h)
+        data = YAML.safe_load(value)
+        cast(data)
+      end
     end
   end
 end

app/models/types/pattern_collection_type.rb → app/models/types/patterns/token.rb

@@ -29,26 +29,24 @@
 #++
 
 module Types
-  class PatternCollectionType < ActiveModel::Type::Value
-    def assert_valid_value(value)
-      cast(value)
-    end
+  module Patterns
+    Token = Data.define(:pattern, :key) do
+      private_class_method :new
 
-    def cast(value)
-      PatternCollection.build(patterns: value).value_or { nil }
-    end
+      def self.build(pattern)
+        new(pattern, pattern.tr("{}", "").to_sym)
+      end
 
-    def serialize(pattern)
-      return super if pattern.nil?
+      def custom_field? = key.to_s.include?("custom_field")
 
-      YAML.dump(pattern.to_h)
-    end
+      def context
+        return :work_package unless custom_field?
 
-    def deserialize(value)
-      return if value.blank?
+        context = key.to_s.gsub(/_?custom_field_\d+/, "")
+        return :work_package if context.blank?
 
-      data = YAML.safe_load(value)
-      cast(data)
+        context.to_sym
+      end
     end
   end
 end