Module: Innate::Node
- Includes:
- Traited
- Defined in:
- lib/innate/node.rb
Overview
The nervous system of Innate, so you can relax.
Node may be included into any class to make it a valid responder to requests.
The major difference between this and the old Ramaze controller is that every Node acts as a standalone application with its own dispatcher.
What’s also an important difference is the fact that Node is a module, so we don’t have to spend a lot of time designing the perfect subclassing scheme.
This makes dispatching more fun, avoids a lot of processing that is done by Rack anyway and lets you tailor your application down to the last action exactly the way you want without worrying about side-effects to other Nodes.
Upon inclusion, it will also include Trinity and Helper to provide you with Request, Response, Session instances, and all the standard helper methods as well as the ability to simply add other helpers.
Please note that method_missing will not be considered when building an Action. There might be future demand for this, but for now you can simply use ‘def index(*args); end` to make a catch-all action.
Constant Summary collapse
- NODE_LIST =
Set.new
Instance Attribute Summary collapse
-
#layout_templates ⇒ Object
readonly
Returns the value of attribute layout_templates.
-
#method_arities ⇒ Object
readonly
Returns the value of attribute method_arities.
-
#view_templates ⇒ Object
readonly
Returns the value of attribute view_templates.
Class Method Summary collapse
- .generate_mapping(object_name = self.name) ⇒ Object
-
.included(into) ⇒ Object
Upon inclusion we make ourselves comfortable.
-
.setup ⇒ Object
node mapping procedure.
Instance Method Summary collapse
-
#action_found(action) ⇒ Innate::Response
Executed once an Action has been found.
-
#action_missing(path) ⇒ Object
The default handler in case no action was found, kind of method_missing.
-
#alias_view(to, from, node = nil) ⇒ Object
Aliasing one view from another.
-
#binding ⇒ Binding
For compatibility with new Kernel#binding behaviour in 1.9.
-
#call(env) ⇒ Array
This makes the Node a valid application for Rack.
- #fill_action(action, given_name) ⇒ Action?
-
#find_aliased_view(action_name, wish) ⇒ nil, String
Resolve one level of aliasing for the given
action_name
andwish
. -
#find_layout(name, wish) ⇒ Array?
Try to find a suitable value for the layout.
-
#find_method(name, params) ⇒ String, Symbol
We check arity if possible, but will happily dispatch to any method that has default parameters.
-
#find_provide(path) ⇒ Array
Resolve possible provides for the given
path
from #provides. -
#find_view(action_name, wish) ⇒ String?
Try to find the best template for the given basename and wish and respect aliased views.
-
#layout(layout_name = nil, &block) ⇒ Proc, String
Define a layout to use on this Node.
-
#layout_mappings ⇒ Array<String>+
Combine Innate.options.layouts with either the ‘ancestral_trait` or the #mapping if the trait yields an empty Array.
-
#map(location) ⇒ Object
Shortcut to map or remap this Node.
-
#map_layouts(*locations) ⇒ Node
Set the paths for lookup below the Innate.options.layouts paths.
-
#map_views(*locations) ⇒ Node
Set the paths for lookup below the Innate.options.views paths.
-
#mapping ⇒ String
Tries to find the relative url that this Node is mapped to.
-
#needs_method? ⇒ true, false
Whether an Action can be built without a method.
- #options ⇒ Object
-
#patterns_for(path) ⇒ Action
The innate beauty in Nitro, Ramaze, and Innate.
-
#possible_exts_for(wish) ⇒ Array
Answer with an array of possible extensions in order of significance for the given
wish
. -
#possible_paths_for(mappings) ⇒ Array
Answer with an array of possible paths in order of significance for template lookup of the given
mappings
. -
#provide(format, param = {}, &block) ⇒ Object
Specify which way contents are provided and processed.
- #provide_handlers ⇒ Hash
-
#provide_set? ⇒ true, false
This will return true if the only provides set are by Node.included.
-
#provides ⇒ Hash
Returns the list of provide handlers.
-
#resolve(path, options = {}) ⇒ nil, Action
Let’s get down to business, first check if we got any wishes regarding the representation from the client, otherwise we will assume he wants html.
-
#root_mappings ⇒ Array
make sure this is an Array and a new instance so modification on the wrapping array doesn’t affect the original option.
-
#to_layout(action_name, wish) ⇒ nil, String
Find the best matching action_name for the layout, if any.
-
#to_template(path, wish) ⇒ nil, String
Try to find a template at the given
path
forwish
. -
#to_view(action_name, wish) ⇒ String?
Try to find the best template for the given basename and wish.
-
#try_resolve(path) ⇒ Response
Let’s try to find some valid action for given
path
. - #update_layout_mappings ⇒ Object
- #update_mapping_shared(paths) ⇒ Object
-
#update_method_arities ⇒ Hash
Answer with a hash, keys are method names, values are method arities.
- #update_template_mappings ⇒ Object
- #update_view_mappings ⇒ Object
-
#view_mappings ⇒ Array<String>+
Combine Innate.options.views with either the ‘ancestral_trait` or the #mapping if the trait yields an empty Array.
Methods included from Traited
#ancestral_trait, #ancestral_trait_values, #class_trait, #each_ancestral_trait, #trait
Instance Attribute Details
#layout_templates ⇒ Object (readonly)
Returns the value of attribute layout_templates.
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# File 'lib/innate/node.rb', line 31 def layout_templates @layout_templates end |
#method_arities ⇒ Object (readonly)
Returns the value of attribute method_arities.
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# File 'lib/innate/node.rb', line 31 def method_arities @method_arities end |
#view_templates ⇒ Object (readonly)
Returns the value of attribute view_templates.
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# File 'lib/innate/node.rb', line 31 def view_templates @view_templates end |
Class Method Details
.generate_mapping(object_name = self.name) ⇒ Object
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# File 'lib/innate/node.rb', line 97 def self.generate_mapping(object_name = self.name) return '/' if NODE_LIST.size == 1 parts = object_name.split('::').map{|part| part.gsub(/^[A-Z]+/){|sub| sub.downcase }.gsub(/[A-Z]+[^A-Z]/, '_\&') } '/' << parts.join('/').downcase end |
.included(into) ⇒ Object
Upon inclusion we make ourselves comfortable.
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# File 'lib/innate/node.rb', line 70 def self.included(into) into.__send__(:include, Helper) into.extend(Trinity, self) NODE_LIST << into return if into.provide_set? into.provide(:html, :engine => :Etanni) into.trait(:provide_set => false) end |
.setup ⇒ Object
node mapping procedure
when Node is included into an object, it’s added to NODE_LIST when object::map(location) is sent, it maps the object into DynaMap when Innate.start is issued, it calls Node::setup Node::setup iterates NODE_LIST and maps all objects not in DynaMap by using Node::generate_mapping(object.name) as location
when object::map(nil) is sent, the object will be skipped in Node::setup
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# File 'lib/innate/node.rb', line 91 def self.setup NODE_LIST.each{|node| node.map(generate_mapping(node.name)) unless node.trait[:skip_node_map] } end |
Instance Method Details
#action_found(action) ⇒ Innate::Response
Executed once an Action has been found.
Reset the Response instance, catch :respond and :redirect. Action#call has to return a String.
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# File 'lib/innate/node.rb', line 328 def action_found(action) response = catch(:respond){ catch(:redirect){ action.call }} unless response.respond_to?(:finish) self.response.write(response) response = self.response end response['Content-Type'] ||= action.[:content_type] response end |
#action_missing(path) ⇒ Object
The default handler in case no action was found, kind of method_missing. Must modify the response in order to have any lasting effect.
Reasoning:
-
We are doing this is in order to avoid tons of special error handling code that would impact runtime and make the overall API more complicated.
-
This cannot be a normal action is that methods defined in Innate::Node will never be considered for actions.
To use a normal action with template do following:
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# File 'lib/innate/node.rb', line 375 def action_missing(path) response = Current.response response.status = 404 response['Content-Type'] = 'text/plain' response.write("No action found at: %p" % path) response end |
#alias_view(to, from, node = nil) ⇒ Object
Aliasing one view from another. The aliases are inherited, and the optional third node
parameter indicates the Node to take the view from.
The argument order is identical with ‘alias` and `alias_method`, which quite honestly confuses me, but at least we stay consistent.
Note that the parameters have been simplified in comparision with Ramaze::Controller::template where the second parameter may be a Controller or the name of the template. We take that now as an optional third parameter.
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# File 'lib/innate/node.rb', line 658 def alias_view(to, from, node = nil) trait[:alias_view] || trait(:alias_view => {}) trait[:alias_view][to.to_s] = node ? [from.to_s, node] : from.to_s end |
#binding ⇒ Binding
For compatibility with new Kernel#binding behaviour in 1.9
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# File 'lib/innate/node.rb', line 940 def binding; super end |
#call(env) ⇒ Array
This makes the Node a valid application for Rack. env
is the environment hash passed from the Rack::Handler
We rely on correct PATH_INFO.
As defined by the Rack spec, PATH_INFO may be empty if it wants the root of the application, so we insert ‘/’ to make our dispatcher simple.
Innate will not rescue any errors for you or do any error handling, this should be done by an underlying middleware.
We do however log errors at some vital points in order to provide you with feedback in your logs.
A lot of functionality in here relies on the fact that call is executed within Current#call which populates the variables used by Trinity. So if you use the Node directly as a middleware make sure that you #use Innate::Current as a middleware before it.
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# File 'lib/innate/node.rb', line 293 def call(env) path = env['PATH_INFO'] path << '/' if path.empty? response.reset try_resolve(path).finish end |
#fill_action(action, given_name) ⇒ Action?
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# File 'lib/innate/node.rb', line 457 def fill_action(action, given_name) needs_method = action.[:needs_method] wish = action.wish patterns_for(given_name) do |name, params| method = find_method(name, params) next unless method if needs_method next unless method if params.any? next unless (view = find_view(name, wish)) || method params.map!{|param| Rack::Utils.unescape(param) } action.merge!(:method => method, :view => view, :params => params, :layout => find_layout(name, wish)) end end |
#find_aliased_view(action_name, wish) ⇒ nil, String
Resolve one level of aliasing for the given action_name
and wish
.
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# File 'lib/innate/node.rb', line 673 def find_aliased_view(action_name, wish) aliased_name, aliased_node = ancestral_trait[:alias_view][action_name] return unless aliased_name aliased_node ||= self aliased_node.update_view_mappings aliased_node.find_view(aliased_name, wish) end |
#find_layout(name, wish) ⇒ Array?
allow layouts combined of method and view… hairy :)
Try to find a suitable value for the layout. This may be a template or the name of a method.
If a layout could be found, an Array with two elements is returned, the first indicating the kind of layout (:layout|:view|:method), the second the found value, which may be a String or Symbol.
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# File 'lib/innate/node.rb', line 492 def find_layout(name, wish) return unless layout = ancestral_trait[:layout] return unless layout = layout.call(name, wish) if layout.respond_to?(:call) if found = to_layout(layout, wish) [:layout, found] elsif found = find_view(layout, wish) [:view, found] elsif found = find_method(layout, []) [:method, found] end end |
#find_method(name, params) ⇒ String, Symbol
Once 1.9 is mainstream we can use Method#parameters to do accurate prediction
We check arity if possible, but will happily dispatch to any method that has default parameters. If you don’t want your method to be responsible for messing up a request you should think twice about the arguments you specify due to limitations in Ruby.
So if you want your method to take only one parameter which may have a default value following will work fine:
def index(foo = "bar", *rest)
But following will respond to /arg1/arg2 and then fail due to ArgumentError:
def index(foo = "bar")
Here a glance at how parameters are expressed in arity:
def index(a) # => 1
def index(a = :a) # => -1
def index(a, *r) # => -2
def index(a = :a, *r) # => -1
def index(a, b) # => 2
def index(a, b, *r) # => -3
def index(a, b = :b) # => -2
def index(a, b = :b, *r) # => -2
def index(a = :a, b = :b) # => -1
def index(a = :a, b = :b, *r) # => -1
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# File 'lib/innate/node.rb', line 546 def find_method(name, params) return unless arity = method_arities[name.to_s] name if arity == params.size || arity < 0 end |
#find_provide(path) ⇒ Array
Resolve possible provides for the given path
from #provides.
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# File 'lib/innate/node.rb', line 431 def find_provide(path) pr = provides name, wish, engine = path, 'html', pr['html_handler'] pr.find do |key, value| key = key[/(.*)_handler$/, 1] next unless path =~ /^(.+)\.#{key}$/i name, wish, engine = $1, key, value end return name, wish, engine end |
#find_view(action_name, wish) ⇒ String?
Try to find the best template for the given basename and wish and respect aliased views.
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# File 'lib/innate/node.rb', line 602 def find_view(action_name, wish) aliased = find_aliased_view(action_name, wish) return aliased if aliased to_view(action_name, wish) end |
#layout(layout_name = nil, &block) ⇒ Proc, String
Define a layout to use on this Node.
A Node can only have one layout, although the template being chosen can depend on #provides.
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# File 'lib/innate/node.rb', line 725 def layout(layout_name = nil, &block) if layout_name and block # default name, but still check with block trait(:layout => lambda{|name, wish| layout_name.to_s if block.call(name, wish) }) elsif layout_name # name of a method or template trait(:layout => layout_name.to_s) elsif block # call block every request with name and wish, returned value is name # of layout template or method trait(:layout => block) else # remove layout for this node trait(:layout => nil) end return ancestral_trait[:layout] end |
#layout_mappings ⇒ Array<String>+
Combine Innate.options.layouts with either the ‘ancestral_trait` or the #mapping if the trait yields an empty Array.
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# File 'lib/innate/node.rb', line 1009 def layout_mappings paths = [*ancestral_trait[:layouts]] paths = ['/'] if paths.empty? [[*.layouts].flatten, [*paths].flatten] end |
#map(location) ⇒ Object
Shortcut to map or remap this Node.
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# File 'lib/innate/node.rb', line 150 def map(location) trait :skip_node_map => true Innate.map(location, self) end |
#map_layouts(*locations) ⇒ Node
Set the paths for lookup below the Innate.options.layouts paths.
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# File 'lib/innate/node.rb', line 996 def map_layouts(*locations) trait :layouts => locations.flatten.uniq self end |
#map_views(*locations) ⇒ Node
Set the paths for lookup below the Innate.options.views paths.
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# File 'lib/innate/node.rb', line 965 def map_views(*locations) trait :views => locations.flatten.uniq self end |
#mapping ⇒ String
Tries to find the relative url that this Innate::Node is mapped to. If it cannot find one it will instead generate one based on the snake_cased name of itself.
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# File 'lib/innate/node.rb', line 121 def mapping Innate.to(self) end |
#needs_method? ⇒ true, false
Whether an Action can be built without a method.
The default is to allow actions that use only a view template, but you might want to turn this on, for example if you have partials in your view directories.
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# File 'lib/innate/node.rb', line 1041 def needs_method? ancestral_trait[:needs_method] end |
#options ⇒ Object
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# File 'lib/innate/node.rb', line 1016 def Innate. end |
#patterns_for(path) ⇒ Action
The innate beauty in Nitro, Ramaze, and Innate.
Will yield the name of the action and parameter for the action method in order of significance.
def foo__bar # responds to /foo/bar
def foo(bar) # also responds to /foo/bar
But foo__bar takes precedence because it’s more explicit.
The last fallback will always be the index action with all of the path turned into parameters.
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# File 'lib/innate/node.rb', line 782 def patterns_for(path) default_action_name = ancestral_trait[:default_action_name] separate_default_action = ancestral_trait[:separate_default_action] atoms = path.split('/') atoms.delete('') result = nil atoms.size.downto(0) do |len| action_name = atoms[0...len].join('__') next if separate_default_action && action_name == default_action_name params = atoms[len..-1] action_name = default_action_name if action_name.empty? && (separate_default_action || params != [default_action_name]) return result if result = yield(action_name, params) end return nil end |
#possible_exts_for(wish) ⇒ Array
Answer with an array of possible extensions in order of significance for the given wish
.
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# File 'lib/innate/node.rb', line 927 def possible_exts_for(wish) pr = provides return unless engine = pr["#{wish}_handler"] View.exts_of(engine).map{|e_ext| [[*wish].map{|w_ext| /#{w_ext}\.#{e_ext}$/ }, /#{e_ext}$/] }.flatten end |
#possible_paths_for(mappings) ⇒ Array
Answer with an array of possible paths in order of significance for template lookup of the given mappings
.
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# File 'lib/innate/node.rb', line 910 def possible_paths_for(mappings) root_mappings.map{|root| mappings.first.map{|inner| mappings.last.map{|outer| ::File.join(root, inner, outer, '/') }}}.flatten end |
#provide(format, param = {}, &block) ⇒ Object
The comment of this method may be too short for the effects it has on the rest of Innate, if you feel something is missing please let me know.
If you specify a block when calling this method you’ll have to take care of rendering views and the like yourself. If you merely want to set a extension and content type you can omit the block.
Specify which way contents are provided and processed.
Use this to set a templating engine, custom Content-Type, or pass a block to take over the processing of the Action and template yourself.
Provides set via this method will be inherited into subclasses.
The format
is extracted from the PATH_INFO, it simply represents the last extension name in the path.
The provide also has influence on the chosen templates for the Action.
Given a request to ‘/list.rss` the template lookup first tries to find `list.rss.erb`, if that fails it falls back to `list.erb`. If neither of these are available it will try to use the return value of the method in the Action as template.
A request to ‘/list.yaml` would match the format ’yaml’
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# File 'lib/innate/node.rb', line 229 def provide(format, param = {}, &block) if param.respond_to?(:to_hash) param = param.to_hash handler = block || View.get(param[:engine]) content_type = param[:type] else handler = View.get(param) end raise(ArgumentError, "Need an engine or block") unless handler trait("#{format}_handler" => handler, :provide_set => true) trait("#{format}_content_type" => content_type) if content_type end |
#provide_handlers ⇒ Hash
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# File 'lib/innate/node.rb', line 262 def provide_handlers ancestral_trait.reject { |key, value| key !~ /_handler$/ } end |
#provide_set? ⇒ true, false
This will return true if the only provides set are by included.
The reasoning behind this is to determine whether the user has touched the provides at all, in which case we will not override the provides in subclasses.
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# File 'lib/innate/node.rb', line 1057 def provide_set? ancestral_trait[:provide_set] end |
#provides ⇒ Hash
Returns the list of provide handlers. This list is cached after the first call to this method.
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# File 'lib/innate/node.rb', line 250 def provides if ancestral_trait[:cache_provides] return ancestral_trait[:provides_cache][self] ||= provide_handlers else return provide_handlers end end |
#resolve(path, options = {}) ⇒ nil, Action
Let’s get down to business, first check if we got any wishes regarding the representation from the client, otherwise we will assume he wants html.
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# File 'lib/innate/node.rb', line 396 def resolve(path, = {}) name, wish, engine = find_provide(path) node = (respond_to?(:ancestors) && respond_to?(:new)) ? self : self.class action = Action.create( :node => node, :wish => wish, :engine => engine, :path => path, :options => ) if !action..key?(:needs_method) action.[:needs_method] = node.needs_method? end if content_type = node.ancestral_trait["#{wish}_content_type"] action.[:content_type] = content_type end node.update_method_arities node.update_template_mappings node.fill_action(action, name) end |
#root_mappings ⇒ Array
make sure this is an Array and a new instance so modification on the wrapping array doesn’t affect the original option. [*arr].object_id == arr.object_id if arr is an Array
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# File 'lib/innate/node.rb', line 950 def root_mappings [*.roots].flatten end |
#to_layout(action_name, wish) ⇒ nil, String
Find the best matching action_name for the layout, if any.
This is mostly an abstract method that you might find handy if you want to do vastly different layout lookup.
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# File 'lib/innate/node.rb', line 695 def to_layout(action_name, wish) return unless files = layout_templates[wish.to_s] files[action_name.to_s] end |
#to_template(path, wish) ⇒ nil, String
Try to find a template at the given path
for wish
.
Since Innate supports multiple paths to templates the path
has to be an Array that may be nested one level.
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# File 'lib/innate/node.rb', line 845 def to_template(path, wish) to_view(path, wish) || to_layout(path, wish) end |
#to_view(action_name, wish) ⇒ String?
Try to find the best template for the given basename and wish.
This method is mostly here for symetry with #to_layout and to allow you overriding the template lookup easily.
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# File 'lib/innate/node.rb', line 623 def to_view(action_name, wish) return unless files = view_templates[wish.to_s] files[action_name.to_s] end |
#try_resolve(path) ⇒ Response
Let’s try to find some valid action for given path
. Otherwise we dispatch to #action_missing.
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# File 'lib/innate/node.rb', line 311 def try_resolve(path) action = resolve(path) action ? action_found(action) : action_missing(path) end |
#update_layout_mappings ⇒ Object
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# File 'lib/innate/node.rb', line 863 def update_layout_mappings if ancestral_trait[:fast_mappings] return @layout_templates if @layout_templates end paths = possible_paths_for(layout_mappings) @layout_templates = update_mapping_shared(paths) end |
#update_mapping_shared(paths) ⇒ Object
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# File 'lib/innate/node.rb', line 872 def update_mapping_shared(paths) mapping = {} paths.reject!{|path| !File.directory?(path) } provides.each do |wish_key, engine| wish = wish_key[/(.*)_handler/, 1] exts = possible_exts_for(wish) paths.reverse_each do |path| Find.find(path) do |file| exts.each do |ext| next unless file =~ ext case file.sub(path, '').gsub('/', '__') when /^(.*)\.(.*)\.(.*)$/ action_name, wish_ext, engine_ext = $1, $2, $3 when /^(.*)\.(.*)$/ action_name, wish_ext, engine_ext = $1, wish, $2 end mapping[wish_ext] ||= {} mapping[wish_ext][action_name] = file end end end end return mapping end |
#update_method_arities ⇒ Hash
Answer with a hash, keys are method names, values are method arities.
Note that this will be executed once for every request, once we have settled things down a bit more we can switch to update based on Reloader hooks and update once on startup. However, that may cause problems with dynamically created methods, so let’s play it safe for now.
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# File 'lib/innate/node.rb', line 567 def update_method_arities if ancestral_trait[:cache_method_arities] \ and ancestral_trait[:method_arity_cache][self] return ancestral_trait[:method_arity_cache][self] end @method_arities = {} exposed = ancestors & Helper::EXPOSE.to_a higher = ancestors.select{|ancestor| ancestor < Innate::Node } (higher + exposed).reverse_each do |ancestor| ancestor.public_instance_methods(false).each do |im| @method_arities[im.to_s] = ancestor.instance_method(im).arity end end if ancestral_trait[:cache_method_arities] ancestral_trait[:method_arity_cache][self] = @method_arities end @method_arities end |
#update_template_mappings ⇒ Object
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# File 'lib/innate/node.rb', line 849 def update_template_mappings update_view_mappings update_layout_mappings end |
#update_view_mappings ⇒ Object
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# File 'lib/innate/node.rb', line 854 def update_view_mappings if ancestral_trait[:fast_mappings] return @view_templates if @view_templates end paths = possible_paths_for(view_mappings) @view_templates = update_mapping_shared(paths) end |
#view_mappings ⇒ Array<String>+
Combine Innate.options.views with either the ‘ancestral_trait` or the #mapping if the trait yields an empty Array.
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# File 'lib/innate/node.rb', line 978 def view_mappings paths = [*ancestral_trait[:views]] paths = [mapping] if paths.empty? [[*.views].flatten, [*paths].flatten] end |