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114 lines
3.9 KiB
114 lines
3.9 KiB
#-- encoding: UTF-8
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#-- copyright
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# OpenProject is an open source project management software.
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# Copyright (C) 2012-2021 the OpenProject GmbH
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License version 3.
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#
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# OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
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# Copyright (C) 2006-2013 Jean-Philippe Lang
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# Copyright (C) 2010-2013 the ChiliProject Team
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License
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# as published by the Free Software Foundation; either version 2
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# of the License, or (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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#
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# See docs/COPYRIGHT.rdoc for more details.
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#++
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# OpenProject in its contracts has checks to govern which attributes are writable. Only attributes marked to be
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# writable, can be set by a user.
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# In some scenarios however, the system needs to set calculated attributes, e.g. if a default value is set - the current user
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# becomes the author of the work package.
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#
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# While an attribute should not be marked as writable, is sometimes still needs to be changed, thus.
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# Such attributes can be changed using this module.
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#
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# The flow would be
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#
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# # The model is an AR class like work package
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# model.extend(OpenProject::ChangedBySystem)
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# model.change_by_system do
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# model.author = current_user
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# end
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#
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# The contract checking later on can then query for
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#
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# model.changed_by_system
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#
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# This method will return the changes carried out inside a change_by_system block. It returns a hash of all the
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# changed attributes as well as the value it was changed from and the value it was changed to.
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#
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# Querying
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#
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# model.changed_by_user
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#
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# will return all attributes changed by the user instead.
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module OpenProject
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module ChangedBySystem
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def changed_by_system(attributes = nil)
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@changed_by_system ||= {}
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if attributes
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@changed_by_system.merge!(attributes)
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end
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@changed_by_system
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end
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# Wrapper to track changes carried out in the context of the system.
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#
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# model.change_by_system do
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# model.attribute = 1
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# end
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#
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# Attribute changes carried out within such a scope will not count to be changed
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# by the user. It can therefore be used to set calculated or default values.
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#
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# This should never be used with user provided values.
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#
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# No only the attribute is tracked but also the values. So it is safe to e.g. first
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# set a default value, and then mass assign attributes. If the default value is overwritten
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# by the mass assignment the change in value will give that away.
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def change_by_system
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prior_changes = non_no_op_changes
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ret = yield
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changed_by_system(changes_compared_to(prior_changes))
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ret
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end
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# Similar to #changed from ActiveRecord this returns all attributes that are
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# currently changed. But it will only include those attributes, that have not
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# been changed within a #change_by_system block and as such are caused by user input.
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def changed_by_user
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(changes.reject { |key, change| changed_by_system[key] == change }).keys
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end
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private
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def non_no_op_changes
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changes.reject { |_, (old, new)| old == 0 && new.nil? }
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end
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def changes_compared_to(prior_changes)
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changes.select { |c| !prior_changes[c] || prior_changes[c].last != changes[c].last }
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end
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end
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end
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