Custom parameter method

README.md

@@ -416,8 +416,12 @@ Special values:
 
 * `:required => true` Will display a red '*' to show it's required
 * `:scope => :the_scope` Will scope parameters in the hash, scoping can be nested. See example
+* `:method => :method_name` Will use specified method as a parameter value
 
-The value of scoped parameters can be set with both scoped (`let(:order_item_item_id)`) and unscoped (`let(:item_id)`) methods. It always searches for the scoped method first and falls back to the unscoped method.
+Retrieving of parameter value goes through several steps:
+1. if `method` option is defined and test case responds to this method then this method is used;
+2. if test case responds to scoped method then this method is used;
+3. overwise unscoped method is used.
 
 ```ruby
 resource "Orders" do
@@ -428,10 +432,13 @@ resource "Orders" do
   post "/orders" do
     parameter :name, "Order Name", :required => true, :scope => :order
     parameter :item, "Order items", :scope => :order
-    parameter :item_id, "Item id", :scope => [:order, :item]
+    parameter :item_id, "Item id", :scope => [:order, :item], method: :custom_item_id
 
-    let(:name) { "My Order" } # OR let(:order_name) { "My Order" }
-    let(:item_id) { 1 } # OR let(:order_item_item_id) { 1 }
+    let(:name) { "My Order" }
+    # OR let(:order_name) { "My Order" }
+    let(:item_id) { 1 }
+    # OR let(:custom_item_id) { 1 }
+    # OR let(:order_item_item_id) { 1 }
 
     example "Creating an order" do
       params.should eq({

lib/rspec_api_documentation/dsl/endpoint.rb

@@ -1,6 +1,7 @@
 require 'rspec/core/formatters/base_formatter'
 require 'rack/utils'
 require 'rack/test/utils'
+require 'rspec_api_documentation/dsl/endpoint/params'
 
 module RspecApiDocumentation::DSL
   # DSL methods available inside the RSpec example.
@@ -63,11 +64,7 @@ def query_string
     end
 
     def params
-      parameters = example.metadata.fetch(:parameters, {}).inject({}) do |hash, param|
-        set_param(hash, param)
-      end
-      parameters.deep_merge!(extra_params)
-      parameters
+      Params.new(self, example, extra_params).call
     end
 
     def header(name, value)
@@ -99,14 +96,6 @@ def status
       rspec_api_documentation_client.status
     end
 
-    def in_path?(param)
-      path_params.include?(param)
-    end
-
-    def path_params
-      example.metadata[:route].scan(/:(\w+)/).flatten
-    end
-
     def path
       example.metadata[:route].gsub(/:(\w+)/) do |match|
         if extra_params.keys.include?($1)
@@ -146,26 +135,5 @@ def delete_extra_param(key)
       @extra_params.delete(key.to_sym) || @extra_params.delete(key.to_s)
     end
 
-    def set_param(hash, param)
-      key = param[:name]
-
-      keys = [param[:scope], key].flatten.compact
-      method_name = keys.join('_')
-
-      return hash if in_path?(method_name)
-
-      unless respond_to?(method_name)
-        method_name = key
-        return hash unless respond_to?(method_name)
-      end
-
-      hash.deep_merge(build_param_hash(keys, method_name))
-    end
-
-    def build_param_hash(keys, method_name)
-      value = keys[1] ? build_param_hash(keys[1..-1], method_name) : send(method_name)
-      { keys[0].to_s => value }
-    end
-
   end
 end

lib/rspec_api_documentation/dsl/endpoint/params.rb

@@ -0,0 +1,30 @@
+require 'rspec_api_documentation/dsl/endpoint/set_param'
+
+module RspecApiDocumentation
+  module DSL
+    module Endpoint
+      class Params
+        attr_reader :example_group, :example
+
+        def initialize(example_group, example, extra_params)
+          @example_group = example_group
+          @example = example
+          @extra_params = extra_params
+        end
+
+        def call
+          parameters = example.metadata.fetch(:parameters, {}).inject({}) do |hash, param|
+            SetParam.new(self, hash, param).call
+          end
+          parameters.deep_merge!(extra_params)
+          parameters
+        end
+
+      private
+
+        attr_reader :extra_params
+
+      end
+    end
+  end
+end

lib/rspec_api_documentation/dsl/endpoint/set_param.rb

@@ -0,0 +1,62 @@
+module RspecApiDocumentation
+  module DSL
+    module Endpoint
+      class SetParam
+        def initialize(parent, hash, param)
+          @parent = parent
+          @hash = hash
+          @param = param
+        end
+
+        def call
+          return hash if path_params.include?(path_name)
+          return hash unless method_name
+
+          hash.deep_merge build_param_hash(key_scope || [key])
+        end
+
+      private
+
+        attr_reader :parent, :hash, :param
+        delegate :example_group, :example, to: :parent
+
+        def key
+          @key ||= param[:name]
+        end
+
+        def key_scope
+          @key_scope ||= param[:scope] && Array(param[:scope]).dup.push(key)
+        end
+
+        def scoped_key
+          @scoped_key ||= key_scope && key_scope.join('_')
+        end
+
+        def custom_method_name
+          param[:method]
+        end
+
+        def path_name
+          scoped_key || key
+        end
+
+        def path_params
+          example.metadata[:route].scan(/:(\w+)/).flatten
+        end
+
+        def method_name
+          @method_name ||= begin
+            [custom_method_name, scoped_key, key].find do |name|
+              name && example_group.respond_to?(name)
+            end
+          end
+        end
+
+        def build_param_hash(keys)
+          value = keys[1] ? build_param_hash(keys[1..-1]) : example_group.send(method_name)
+          { keys[0].to_s => value }
+        end
+      end
+    end
+  end
+end

spec/dsl_spec.rb

@@ -59,8 +59,8 @@
   post "/orders" do
     parameter :type, "The type of drink you want.", :required => true
     parameter :size, "The size of drink you want.", :required => true
-    parameter :note, "Any additional notes about your order."
-    parameter :name, :scope => :order
+    parameter :note, "Any additional notes about your order.", method: :custom_note
+    parameter :name, :scope => :order, method: :custom_order_name
 
     response_field :type, "The type of drink you ordered.", :scope => :order
     response_field :size, "The size of drink you ordered.", :scope => :order
@@ -71,6 +71,12 @@
     let(:type) { "coffee" }
     let(:size) { "medium" }
 
+    let(:note) { "Made in Brazil" }
+    let(:custom_note) { "Made in India" }
+
+    let(:order_name) { "Nescoffee" }
+    let(:custom_order_name) { "Jakobz" }
+
     describe "example metadata" do
       subject { |example| example.metadata }
 
@@ -79,8 +85,8 @@
           [
             { :name => "type", :description => "The type of drink you want.", :required => true },
             { :name => "size", :description => "The size of drink you want.", :required => true },
-            { :name => "note", :description => "Any additional notes about your order." },
-            { :name => "name", :description => "Order name", :scope => :order},
+            { :name => "note", :description => "Any additional notes about your order.", method: :custom_note },
+            { :name => "name", :description => "Order name", :scope => :order, method: :custom_order_name },
           ]
         )
       end
@@ -103,7 +109,12 @@
 
       describe "params" do
         it "should equal the assigned parameter values" do
-          expect(params).to eq("type" => "coffee", "size" => "medium")
+          expect(params).to eq({
+            "type" => "coffee",
+            "size" => "medium",
+            "note" => "Made in India",
+            "order" => { "name" => "Jakobz" }
+          })
         end
       end
     end