Add frontmatter parser helper

app/controllers/projects_controller.rb

@@ -1,4 +1,6 @@
 class ProjectsController < ApplicationController
+  include HasFrontmatter
+
   def index
     @projects = Project.all
 
@@ -56,16 +58,6 @@ class ProjectsController < ApplicationController
     }
   end
 
-  def parse_frontmatter(content)
-    if content =~ /\A(---\s*\n.*?\n?)^(---\s*$\n?)/m
-      metadata = YAML.safe_load($1)
-      content = content[$2.size..-1]
-      [ metadata, content ]
-    else
-      [ {}, content ]
-    end
-  end
-
   def render_not_found
     render file: "#{Rails.root}/public/404.html", status: :not_found
   end

app/models/concerns/has_frontmatter.rb

@@ -0,0 +1,51 @@
+module HasFrontmatter
+  extend ActiveSupport::Concern
+
+  class_methods do
+    def parse_frontmatter(content)
+      if content =~ /\A(---\s*\n.*?\n?)^(---\s*$\n?)(.*)/m
+        begin
+          metadata = YAML.safe_load($1)
+          metadata = {} unless metadata.is_a?(Hash)
+        rescue Psych::SyntaxError, StandardError => e
+          Rails.logger.warn "Failed to parse frontmatter: #{e.message}"
+          metadata = {}
+        end
+        content = $3
+        [ safe_parse_metadata(metadata), content ]
+      else
+        [ {}, content ]
+      end
+    end
+
+    private
+
+    def safe_parse_metadata(metadata)
+      {
+        "title" => safe_parse_field(metadata, "title"),
+        "author" => safe_parse_field(metadata, "author"),
+        "description" => safe_parse_field(metadata, "description"),
+        "created_at" => safe_parse_date(metadata, "created_at")
+      }
+    end
+
+    def safe_parse_field(metadata, field)
+      return nil unless metadata.is_a?(Hash)
+      value = metadata[field]
+      return nil if value.nil?
+      value.to_s.strip
+    end
+
+    def safe_parse_date(metadata, field)
+      return nil unless metadata.is_a?(Hash)
+      value = metadata[field]
+      return nil if value.nil?
+
+      begin
+        Date.parse(value.to_s)
+      rescue Date::Error
+        nil
+      end
+    end
+  end
+end

app/models/project.rb

@@ -1,5 +1,6 @@
 class Project
   include MarkdownRenderable
+  include HasFrontmatter
   attr_reader :user, :project_name, :title, :author, :description, :created_at, :content
 
   def initialize(attributes = {})
@@ -35,6 +36,7 @@ class Project
 
   def created_at_date
     return nil unless created_at
+    return created_at if created_at.is_a?(Date)
     Date.parse(created_at)
   rescue Date::Error
     nil
@@ -128,16 +130,4 @@ class Project
       content: render_markdown(markdown_content)
     )
   end
-
-  private
-
-  def self.parse_frontmatter(content)
-    if content =~ /\A(---\s*\n.*?\n?)^(---\s*$\n?)(.*)/m
-      metadata = YAML.safe_load($1)
-      content = $3
-      [ metadata, content ]
-    else
-      [ {}, content ]
-    end
-  end
 end