Add antenna elements limit

app/models/antenna.rb

@@ -30,6 +30,10 @@ class Antenna < ApplicationRecord
   include Expireable
 
   LIMIT = 30
+  DOMAINS_PER_ANTENNA_LIMIT = 20
+  ACCOUNTS_PER_ANTENNA_LIMIT = 100
+  TAGS_PER_ANTENNA_LIMIT = 50
+  KEYWORDS_PER_ANTENNA_LIMIT = 100
 
   has_many :antenna_domains, inverse_of: :antenna, dependent: :destroy
   has_many :antenna_tags, inverse_of: :antenna, dependent: :destroy

app/models/antenna_account.rb

@@ -14,4 +14,17 @@
 class AntennaAccount < ApplicationRecord
   belongs_to :antenna
   belongs_to :account
+
+  validate :duplicate_account
+  validate :limit_per_antenna
+
+  private
+
+  def duplicate_account
+    raise Mastodon::ValidationError, I18n.t('antennas.errors.duplicate_account') if AntennaAccount.exists?(antenna_id: antenna_id, account_id: account_id, exclude: exclude)
+  end
+
+  def limit_per_antenna
+    raise Mastodon::ValidationError, I18n.t('antennas.errors.limit.accounts') if AntennaAccount.where(antenna_id: antenna_id).count >= Antenna::ACCOUNTS_PER_ANTENNA_LIMIT
+  end
 end

app/models/antenna_domain.rb

@@ -15,8 +15,15 @@ class AntennaDomain < ApplicationRecord
   belongs_to :antenna
 
   validate :duplicate_domain
+  validate :limit_per_antenna
+
+  private
 
   def duplicate_domain
     raise Mastodon::ValidationError, I18n.t('antennas.errors.duplicate_domain') if AntennaDomain.exists?(antenna_id: antenna_id, name: name, exclude: exclude)
   end
+
+  def limit_per_antenna
+    raise Mastodon::ValidationError, I18n.t('antennas.errors.limit.domains') if AntennaDomain.where(antenna_id: antenna_id).count >= Antenna::DOMAINS_PER_ANTENNA_LIMIT
+  end
 end

app/models/antenna_tag.rb

@@ -14,4 +14,17 @@
 class AntennaTag < ApplicationRecord
   belongs_to :antenna
   belongs_to :tag
+
+  validate :duplicate_tag
+  validate :limit_per_antenna
+
+  private
+
+  def duplicate_tag
+    raise Mastodon::ValidationError, I18n.t('antennas.errors.duplicate_tag') if AntennaTag.exists?(antenna_id: antenna_id, tag_id: tag_id, exclude: exclude)
+  end
+
+  def limit_per_antenna
+    raise Mastodon::ValidationError, I18n.t('antennas.errors.limit.tags') if AntennaTag.where(antenna_id: antenna_id).count >= Antenna::TAGS_PER_ANTENNA_LIMIT
+  end
 end