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rails--rails/actionpack/lib/action_controller/record_identifier.rb

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2009-05-13 04:10:37 -04:00
require 'active_support/core_ext/module'
module ActionController
# The record identifier encapsulates a number of naming conventions for dealing with records, like Active Records or
# Active Resources or pretty much any other model type that has an id. These patterns are then used to try elevate
# the view actions to a higher logical level. Example:
#
# # routes
# map.resources :posts
#
# # view
# <% div_for(post) do %> <div id="post_45" class="post">
# <%= post.body %> What a wonderful world!
# <% end %> </div>
#
# # controller
# def destroy
# post = Post.find(params[:id])
# post.destroy
#
# respond_to do |format|
# format.html { redirect_to(post) } # Calls polymorphic_url(post) which in turn calls post_url(post)
# format.js do
# # Calls: new Effect.fade('post_45');
# render(:update) { |page| page[post].visual_effect(:fade) }
# end
# end
# end
#
# As the example above shows, you can stop caring to a large extent what the actual id of the post is. You just know
# that one is being assigned and that the subsequent calls in redirect_to and the RJS expect that same naming
# convention and allows you to write less code if you follow it.
module RecordIdentifier
extend self
JOIN = '_'.freeze
NEW = 'new'.freeze
# The DOM class convention is to use the singular form of an object or class. Examples:
#
# dom_class(post) # => "post"
# dom_class(Person) # => "person"
#
# If you need to address multiple instances of the same class in the same view, you can prefix the dom_class:
#
# dom_class(post, :edit) # => "edit_post"
# dom_class(Person, :edit) # => "edit_person"
def dom_class(record_or_class, prefix = nil)
singular = singular_class_name(record_or_class)
prefix ? "#{prefix}#{JOIN}#{singular}" : singular
end
# The DOM id convention is to use the singular form of an object or class with the id following an underscore.
# If no id is found, prefix with "new_" instead. Examples:
#
# dom_id(Post.find(45)) # => "post_45"
# dom_id(Post.new) # => "new_post"
#
# If you need to address multiple instances of the same class in the same view, you can prefix the dom_id:
#
# dom_id(Post.find(45), :edit) # => "edit_post_45"
def dom_id(record, prefix = nil)
Adds #key and #to_param to the AMo interface This commit introduces two new methods that every AMo compliant object must implement. Below are the default implementations along with the implied interface contract. # Returns an Enumerable of all (primary) key # attributes or nil if new_record? is true def key new_record? ? nil : [1] end # Returns a string representing the object's key # suitable for use in URLs, or nil if new_record? # is true def to_param key ? key.first.to_s : nil end 1) The #key method Previously rails' record_identifier code, which is used in the #dom_id helper, relied on calling #id on the record to provide a reasonable DOM id. Now with rails3 being all ORM agnostic, it's not safe anymore to assume that every record ever will have an #id as its primary key attribute. Having a #key method available on every AMo object means that #dom_id can be implemented using record.to_model.key # instead of record.id Using this we're able to take composite primary keys into account (e.g. available in datamapper) by implementing #dom_id using a newly added record_key_for_dom_id(record) method. The user can overwrite this method to provide customized versions of the object's key used in #dom_id. Also, dealing with more complex keys that can contain arbitrary strings, means that we need to make sure that we only provide DOM ids that are valid according to the spec. For this reason, this patch sends the key provided through a newly added sanitize_dom_id(candidate_id) method, that makes sure we only produce valid HTML The reason to not just add #dom_id to the AMo interface was that it feels like providing a DOM id should not be a model concern. Adding #dom_id to the AMo interface would force these concern on the model, while it's better left to be implemented in a helper. Now one could say the same is true for #to_param, and actually I think that it doesn't really fit into the model either, but it's used in AR and it's a main part of integrating into the rails router. This is different from #dom_id which is only used in view helpers and can be implemented on top of a semantically more meaningful method like #key. 2) The #to_param method Since the rails router relies on #to_param to be present, AR::Base implements it and returns the id by default, allowing the user to overwrite the method if desired. Now with different ORMs integrating into rails, every ORM railtie needs to implement it's own #to_param implementation while already providing code to be AMo compliant. Since the whole point of AMo compliance seems to be to integrate any ORM seamlessly into rails, it seems fair that all we really need to do as another ORM, is to be AMo compliant. By including #to_param into the official interface, we can make sure that this code can be centralized in the various AMo compliance layers, and not be added separately by every ORM railtie. 3) All specs pass
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if record_id = record_key_for_dom_id(record)
"#{dom_class(record, prefix)}#{JOIN}#{record_id}"
else
dom_class(record, prefix || NEW)
end
end
Adds #key and #to_param to the AMo interface This commit introduces two new methods that every AMo compliant object must implement. Below are the default implementations along with the implied interface contract. # Returns an Enumerable of all (primary) key # attributes or nil if new_record? is true def key new_record? ? nil : [1] end # Returns a string representing the object's key # suitable for use in URLs, or nil if new_record? # is true def to_param key ? key.first.to_s : nil end 1) The #key method Previously rails' record_identifier code, which is used in the #dom_id helper, relied on calling #id on the record to provide a reasonable DOM id. Now with rails3 being all ORM agnostic, it's not safe anymore to assume that every record ever will have an #id as its primary key attribute. Having a #key method available on every AMo object means that #dom_id can be implemented using record.to_model.key # instead of record.id Using this we're able to take composite primary keys into account (e.g. available in datamapper) by implementing #dom_id using a newly added record_key_for_dom_id(record) method. The user can overwrite this method to provide customized versions of the object's key used in #dom_id. Also, dealing with more complex keys that can contain arbitrary strings, means that we need to make sure that we only provide DOM ids that are valid according to the spec. For this reason, this patch sends the key provided through a newly added sanitize_dom_id(candidate_id) method, that makes sure we only produce valid HTML The reason to not just add #dom_id to the AMo interface was that it feels like providing a DOM id should not be a model concern. Adding #dom_id to the AMo interface would force these concern on the model, while it's better left to be implemented in a helper. Now one could say the same is true for #to_param, and actually I think that it doesn't really fit into the model either, but it's used in AR and it's a main part of integrating into the rails router. This is different from #dom_id which is only used in view helpers and can be implemented on top of a semantically more meaningful method like #key. 2) The #to_param method Since the rails router relies on #to_param to be present, AR::Base implements it and returns the id by default, allowing the user to overwrite the method if desired. Now with different ORMs integrating into rails, every ORM railtie needs to implement it's own #to_param implementation while already providing code to be AMo compliant. Since the whole point of AMo compliance seems to be to integrate any ORM seamlessly into rails, it seems fair that all we really need to do as another ORM, is to be AMo compliant. By including #to_param into the official interface, we can make sure that this code can be centralized in the various AMo compliance layers, and not be added separately by every ORM railtie. 3) All specs pass
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# Returns a string representation of the key attribute(s) that is suitable for use in an HTML DOM id.
# This can be overwritten to customize the default generated string representation if desired.
# If you need to read back a key from a dom_id in order to query for the underlying database record,
# you should write a helper like 'person_record_from_dom_id' that will extract the key either based
# on the default implementation (which just joins all key attributes with '-') or on your own
# overwritten version of the method. By default, this implementation passes the key string through a
# method that replaces all characters that are invalid inside DOM ids, with valid ones. You need to
# make sure yourself that your dom ids are valid, in case you overwrite this method.
def record_key_for_dom_id(record)
return record.id unless record.respond_to?(:to_model)
AMo #key is now #to_key and CI is probably happy Obviously #key is a too common name to be included in the AMo interface, #to_key fits better and also relates nicely to #to_param. Thx wycats, koz and josevalim for the suggestion. AR's #to_key implementation now takes customized primary keys into account and there's a testcase for that too. The #to_param AMo lint makes no assumptions on how the method behaves in the presence of composite primary keys. It leaves the decision wether to provide a default, or to raise and thus signal to the user that implementing this method will need his special attention, up to the implementers. All AMo cares about is that #to_param is implemented and returns nil in case of a new_record?. The default CompliantObject used in lint_test provides a naive default implementation that just joins all key attributes with '-'. The #to_key default implementation in lint_test's CompliantObject now returns [id] instead of [1]. This was previously causing the (wrong) tests I added for AR's #to_key implementation to pass. The #to_key tests added with this patch should be better. The CI failure was caused by my lack of knowledge about the test:isolated task. The tests for the record_identifier code in action_controller are using fake non AR models and I forgot to stub the #to_key method over there. This issue didn't come up when running the test task, only test:isolated revealed it. This patch fixes that. All tests pass isolated or not, well, apart from one previously unpended test in action_controller that is unrelated to my patch.
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key = record.to_model.to_key
key ? sanitize_dom_id(key.join('_')) : key
Adds #key and #to_param to the AMo interface This commit introduces two new methods that every AMo compliant object must implement. Below are the default implementations along with the implied interface contract. # Returns an Enumerable of all (primary) key # attributes or nil if new_record? is true def key new_record? ? nil : [1] end # Returns a string representing the object's key # suitable for use in URLs, or nil if new_record? # is true def to_param key ? key.first.to_s : nil end 1) The #key method Previously rails' record_identifier code, which is used in the #dom_id helper, relied on calling #id on the record to provide a reasonable DOM id. Now with rails3 being all ORM agnostic, it's not safe anymore to assume that every record ever will have an #id as its primary key attribute. Having a #key method available on every AMo object means that #dom_id can be implemented using record.to_model.key # instead of record.id Using this we're able to take composite primary keys into account (e.g. available in datamapper) by implementing #dom_id using a newly added record_key_for_dom_id(record) method. The user can overwrite this method to provide customized versions of the object's key used in #dom_id. Also, dealing with more complex keys that can contain arbitrary strings, means that we need to make sure that we only provide DOM ids that are valid according to the spec. For this reason, this patch sends the key provided through a newly added sanitize_dom_id(candidate_id) method, that makes sure we only produce valid HTML The reason to not just add #dom_id to the AMo interface was that it feels like providing a DOM id should not be a model concern. Adding #dom_id to the AMo interface would force these concern on the model, while it's better left to be implemented in a helper. Now one could say the same is true for #to_param, and actually I think that it doesn't really fit into the model either, but it's used in AR and it's a main part of integrating into the rails router. This is different from #dom_id which is only used in view helpers and can be implemented on top of a semantically more meaningful method like #key. 2) The #to_param method Since the rails router relies on #to_param to be present, AR::Base implements it and returns the id by default, allowing the user to overwrite the method if desired. Now with different ORMs integrating into rails, every ORM railtie needs to implement it's own #to_param implementation while already providing code to be AMo compliant. Since the whole point of AMo compliance seems to be to integrate any ORM seamlessly into rails, it seems fair that all we really need to do as another ORM, is to be AMo compliant. By including #to_param into the official interface, we can make sure that this code can be centralized in the various AMo compliance layers, and not be added separately by every ORM railtie. 3) All specs pass
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end
# Replaces characters that are invalid in HTML DOM ids with valid ones.
def sanitize_dom_id(candidate_id)
candidate_id # TODO implement conversion to valid DOM id values
end
# Returns the plural class name of a record or class. Examples:
#
# plural_class_name(post) # => "posts"
# plural_class_name(Highrise::Person) # => "highrise_people"
def plural_class_name(record_or_class)
model_name_from_record_or_class(record_or_class).plural
end
# Returns the singular class name of a record or class. Examples:
#
# singular_class_name(post) # => "post"
# singular_class_name(Highrise::Person) # => "highrise_person"
def singular_class_name(record_or_class)
model_name_from_record_or_class(record_or_class).singular
end
private
def model_name_from_record_or_class(record_or_class)
(record_or_class.is_a?(Class) ? record_or_class : record_or_class.class).model_name
end
end
end