initial data model implementation

app/models/application_record.rb

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+class ApplicationRecord < ActiveRecord::Base
+  primary_abstract_class
+end

app/models/comment.rb

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+class Comment < ApplicationRecord
+  belongs_to :user
+  belongs_to :commentable, polymorphic: true
+
+  validates :body, presence: true
+end

app/models/entry.rb

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+class Entry < ApplicationRecord
+  belongs_to :created_by, class_name: "User", optional: true
+  belongs_to :updated_by, class_name: "User", optional: true
+
+  has_many :suggested_meanings, dependent: :destroy
+  has_many :comments, as: :commentable, dependent: :destroy
+  has_many :entry_versions, dependent: :destroy
+
+  enum category: {
+    word: 0,
+    phrase: 1,
+    name: 2,
+    title: 3,
+    reference: 4,
+    other: 5
+  }
+
+  validates :category, presence: true
+end

app/models/entry_version.rb

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+class EntryVersion < ApplicationRecord
+  belongs_to :entry
+  belongs_to :user
+
+  validates :changes_made, presence: true
+end

app/models/suggested_meaning.rb

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+class SuggestedMeaning < ApplicationRecord
+  belongs_to :entry
+  belongs_to :submitted_by, class_name: "User"
+  belongs_to :reviewed_by, class_name: "User", optional: true
+  belongs_to :language,
+             class_name: "SupportedLanguage",
+             foreign_key: :language_code,
+             primary_key: :code
+
+  enum status: {
+    pending: 0,
+    accepted: 1,
+    rejected: 2
+  }
+
+  validates :language_code, presence: true
+  validates :alternative_translation, presence: true
+end

app/models/supported_language.rb

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+class SupportedLanguage < ApplicationRecord
+  has_many :suggested_meanings,
+           foreign_key: :language_code,
+           primary_key: :code,
+           dependent: :restrict_with_exception
+
+  validates :code, presence: true, uniqueness: true
+  validates :name, presence: true
+  validates :native_name, presence: true
+end

app/models/user.rb

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+class User < ApplicationRecord
+  has_secure_password
+
+  belongs_to :invited_by, class_name: "User", optional: true
+  has_many :invited_users, class_name: "User", foreign_key: :invited_by_id, dependent: :nullify
+
+  has_many :created_entries, class_name: "Entry", foreign_key: :created_by_id, dependent: :nullify
+  has_many :updated_entries, class_name: "Entry", foreign_key: :updated_by_id, dependent: :nullify
+  has_many :submitted_suggested_meanings,
+           class_name: "SuggestedMeaning",
+           foreign_key: :submitted_by_id,
+           dependent: :nullify
+  has_many :reviewed_suggested_meanings,
+           class_name: "SuggestedMeaning",
+           foreign_key: :reviewed_by_id,
+           dependent: :nullify
+  has_many :entry_versions, dependent: :nullify
+  has_many :comments, dependent: :nullify
+
+  enum role: {
+    contributor: 0,
+    reviewer: 1,
+    admin: 2
+  }
+
+  validates :email, presence: true, uniqueness: true
+end