Fix Coding style issues (ameba)

spec/model/model_spec.cr

@@ -335,7 +335,8 @@ module ModelSpec
           reinit
 
           u = User.create!({first_name: "Join User"})
-          p = Post.create!({title: "A Post", user_id: u.id})
+
+          Post.create!({title: "A Post", user_id: u.id})
 
           Post.query.join("model_users") { model_posts.user_id == model_users.id }.to_sql
             .should eq "SELECT model_posts.* FROM model_posts INNER JOIN model_users " +
@@ -347,16 +348,15 @@ module ModelSpec
         temporary do
           reinit
           u = User.create!({first_name: "Join User"})
-          p = Post.create!({title: "A Post", user_id: u.id})
+          Post.create!({title: "A Post", user_id: u.id})
 
           user_with_a_post_minimum = User.query.distinct.join("model_posts") { model_posts.user_id == model_users.id }
 
           user_with_a_post_minimum.to_sql.should eq \
             "SELECT DISTINCT model_users.* FROM model_users INNER JOIN " +
             "model_posts ON ((model_posts.user_id = model_users.id))"
 
-          user_with_a_post_minimum.with_posts.each do |u|
-          end
+          user_with_a_post_minimum.with_posts.each { } # Should just execute
         end
       end
     end

src/clear/model/modules/is_polymorphic.cr

@@ -6,10 +6,10 @@ module Clear::Model::IsPolymorphic
   end
 
   abstract class Factory
-    abstract def build(h : Hash(String, ::Clear::SQL::Any ),
-      cache : Clear::Model::QueryCache? = nil,
-      persisted = false,
-      fetch_columns = false ) : Clear::Model
+    abstract def build(h : Hash(String, ::Clear::SQL::Any),
+                       cache : Clear::Model::QueryCache? = nil,
+                       persisted = false,
+                       fetch_columns = false) : Clear::Model
   end
 
   macro included
@@ -82,7 +82,7 @@ module Clear::Model::IsPolymorphic
           when {{c.id}}.name
             {{c.id}}.new(h, cache, persisted, fetch_columns)
         {% end %}
-        when Nil
+        when nil
           raise "No data in column #{@through}, impossible to instantiate !"
         else
           raise "Unknown class: #{h[@through]}"
@@ -92,5 +92,4 @@ module Clear::Model::IsPolymorphic
 
     @@factory = Factory.new({{through}})
   end
-
-end
+end