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您将如何更改以下试图复制 Stackoverflow 功能的模式:
create_table "questions", :force => true do |t|
t.text "question", :null => false
t.text "description", :null => false
t.integer "up_votes", :null => false, :default => 0
t.integer "down_votes", :null => false, :default => 0
t.timestamps
end
create_table "answers", :force => true do |t|
t.integer "question_id", :null => false
t.text "answer", :null => false
t.integer "up_votes", :null => false, :default => 0
t.integer "down_votes", :null => false, :default => 0
t.timestamps
end
create_table "question_comments", :force => true do |t|
t.integer "question_id", :null => false
t.text "comment", :null => false
t.timestamps
end
create_table "answer_comments", :force => true do |t|
t.integer "answer_id", :null => false
t.text "comment", :null => false
t.timestamps
end
create_table "tags", :force => true do |t|
t.string "tag", :null => false, :limit => 100
t.timestamps
end
add_index "tags", ["tag"], :name => "tag_UNIQUE", :unique => true
create_table "question_tags", :force => true do |t|
t.integer "question_id", :null => false
t.integer "tag_id", :null => false
t.timestamps
end
create_table "users", :force => true do |t|
t.string "first_name", :limit => 45, :null => false
t.string "last_name", :limit => 45, :null => false
t.string "email", :limit => 100, :null => false
t.string "password", :null => false
t.string "salt", :null => false
t.timestamps
end
create_table "user_votes", :force => true do |t|
t.integer "user_id", :null => false
t.integer "question_id"
t.integer "answer_id"
t.boolean "is_positive_vote"
t.timestamps
end
create_table "user_favorites", :force => true do |t|
t.integer "user_id", :null => false
t.integer "question_id"
t.integer "answer_id"
t.timestamps
end
create_table "question_flags", :force => true do |t|
t.integer "user_id", :null => false
t.integer "question_id"
t.timestamps
end
create_table "answer_flags", :force => true do |t|
t.integer "user_id", :null => false
t.integer "question_id"
t.timestamps
end
create_table "related_questions", :force => true do |t|
t.integer "question_id", :null => false
t.integer "related_question_id", :null => false
t.timestamps
end