🧹🥗 Journal: Add Entry#summary field (#8)

- zinc-collective#10

What I'm driving towards here is similar to
#2055, where a
`Journal::Entry` has an affordance for being opinionated about how it's
represented when linked to in search engines or peer-to-peer sharing; as
well as short text for when there are a several on `Journal#show`.

app/furniture/journal/entry.rb

@@ -33,6 +33,9 @@ class Entry < ApplicationRecord
 
     scope :matching_keywords, ->(keywords) { where("keywords::text[] && ARRAY[?]::text[]", keywords) }
 
+    SUMMARY_MAX_LENGTH = 300
+    validates :summary, length: {maximum: SUMMARY_MAX_LENGTH, allow_blank: true}
+
     def migrate_to(journal:, keywords: [])
       new_body = keywords.present? ? body + "\n##{keywords.join(" #")}" : body
       update(journal: journal, body: new_body)

db/migrate/20240129014151_journal_add_description_to_entry.rb

@@ -0,0 +1,5 @@
+class JournalAddDescriptionToEntry < ActiveRecord::Migration[7.1]
+  def change
+    add_column :journal_entries, :summary, :text
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[7.1].define(version: 2024_01_20_034325) do
+ActiveRecord::Schema[7.1].define(version: 2024_01_29_014151) do
   # These are extensions that must be enabled in order to support this database
   enable_extension "pgcrypto"
   enable_extension "plpgsql"
@@ -116,6 +116,7 @@
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
     t.string "keywords", array: true
+    t.text "summary"
     t.index ["journal_id"], name: "index_journal_entries_on_journal_id"
   end
 

spec/furniture/journal/entry_spec.rb

@@ -22,6 +22,10 @@
     end
   end
 
+  describe "#summary" do
+    it { is_expected.to validate_length_of(:summary).is_at_most(300).allow_blank }
+  end
+
   describe "#save" do
     let(:entry) { create(:journal_entry, body: "#GoodTimes") }
     let(:journal) { entry.journal }