Tweaks to allow for single instance models

lib/dato_cms_graphql.rb

@@ -45,6 +45,10 @@ def self.query(query, variables: {})
     end
   end
 
+  def self.query_one(query, variables: {})
+    Client.query(query, variables: variables).data.item.to_h.deep_transform_keys { |k| k.underscore }
+  end
+
   def self.count(query, variables: {})
     Client.query(query, variables: variables).data.meta_data.count
   end

lib/dato_cms_graphql/graphql_base.rb

@@ -4,11 +4,17 @@ module DatoCmsGraphql
   class GraphqlBase
     class_attribute :graphql_page_size
     class_attribute :fields
+    class_attribute :graphql_single_instance
+
     class << self
       def page_size(value)
         self.graphql_page_size = value
       end
 
+      def single_instance(value)
+        self.graphql_single_instance = value
+      end
+
       def query_name
         to_s.humanize.pluralize
       end
@@ -20,15 +26,22 @@ def graphql_fields(*args)
 
       def initialize_queries
         class_eval do
-          const_set(:INDEX, query_for)
-          const_set(:META_DATA, meta_data_query)
+          const_set(:SINGLE, query_for_single) if single_instance?
+          const_set(:INDEX, query_for) unless single_instance?
+          const_set(:META_DATA, meta_data_query) unless single_instance?
         end
       end
 
       def plural_name
         to_s.pluralize
       end
 
+      def single_name
+        rv = to_s
+        rv[0] = rv[0].downcase
+        rv
+      end
+
       def parse(query)
         DatoCmsGraphql::Client.parse(query)
       end
@@ -43,6 +56,16 @@ def query_for
         GRAPHQL
       end
 
+      def query_for_single
+        parse <<~GRAPHQL
+          query {
+            item: #{single_name} {
+              #{fields}
+            }
+          }
+        GRAPHQL
+      end
+
       def meta_data_query
         parse <<~GRAPHQL
           query {
@@ -54,18 +77,28 @@ def meta_data_query
       end
 
       def all
+        raise "This is a single instance model" if single_instance?
         ModelIterator.new(self)
       end
+
+      def get
+        new(DatoCmsGraphql.query_one(self::SINGLE))
+      end
+
+      def single_instance?
+        graphql_single_instance || false
+      end
     end
 
     attr_reader :attributes
     page_size(100) # Set the maximum page size as default.
+    single_instance(false)
 
     def initialize(attributes)
       @attributes = JSON.parse(attributes.to_json, object_class: OpenStruct)
     end
 
-    def respond_to_missing?(method)
+    def respond_to_missing?(method, *args)
       @attributes.respond_to?(method)
     end
 

lib/dato_cms_graphql/version.rb

@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module DatoCmsGraphql
-  VERSION = "0.1.1"
+  VERSION = "0.1.2"
 end