Sinatra：参数数量错误（4 代表 0..2）
Sinatra: wrong number of arguments (4 for 0..2)
我目前正在使用 Sinatra、ActiveRecord 和 MySQL[=32 开发应用程序=].我正在处理注册表单，它看起来像这样：
app.rb:
post '/signup' do
password_salt = BCrypt::Engine.generate_salt
password_hash = BCrypt::Engine.hash_secret(params[:password], password_salt)
@usuarios = User.new(params[:nombre], params[:cedula], password_hash, "admin")
if @usuarios.save
redirect './signup', :notice => "Usuario creado exitosamente."
else
redirect './signup', :error => "Ha ocurrido un error, intente nuevamente."
end
end
视图看起来像这样，signup.erb:
<form id="registro" action="/signup" method="POST">
<fieldset>
<legend>Ingrese sus datos</legend>
<label>Nombre
<input type="text" name="nombre">
</label>
<label>Cédula
<input type="text" maxlength="10" name="cedula">
</label>
<label>Contraseña
<input type="password" name="password">
</label>
<!-- TO-DO:
Dropdown list con los diferentes tipos de usuarios, i.e.: admin, secretario, etc.
-->
<input type="submit" id="registerButton" class="button small">Finalizar registro</a>
</fieldset>
</form>
每当我尝试创建新用户时，都会收到以下错误：
ArgumentError - wrong number of arguments (4 for 0..2)
考虑到 table 我尝试插入的值有 4 列，我不明白为什么会出现此错误。
任何能帮助我解决这个不便的见解都将不胜感激！
提前致谢。
ActiveRecord::new 方法只允许 2 个参数作为参数，它应该是一个散列。修复：
User.new(params[:nombre], params[:cedula], password_hash, "admin")
至：
User.new(nombre: params[:nombre], cedula: params[:cedula], password: password_hash, role: "admin")
你应该经常查看文档，在 99% 的情况下你可以找到问题：
New objects can be instantiated as either empty (pass no construction
parameter) or pre-set with attributes but not yet saved (pass a hash
with key names matching the associated table column names). In both
instances, valid attribute keys are determined by the column names of
the associated table – hence you can’t have attributes that aren’t
part of the table columns.
new(attributes = nil, options = {})
示例：
# Instantiates a single new object
User.new(:first_name => 'Jamie')
# Instantiates a single new object using the :admin mass-assignment security role
User.new({ :first_name => 'Jamie', :is_admin => true }, :as => :admin)
# Instantiates a single new object bypassing mass-assignment security
User.new({ :first_name => 'Jamie', :is_admin => true }, :without_protection => true)
我目前正在使用 Sinatra、ActiveRecord 和 MySQL[=32 开发应用程序=].我正在处理注册表单，它看起来像这样：
app.rb:
post '/signup' do
password_salt = BCrypt::Engine.generate_salt
password_hash = BCrypt::Engine.hash_secret(params[:password], password_salt)
@usuarios = User.new(params[:nombre], params[:cedula], password_hash, "admin")
if @usuarios.save
redirect './signup', :notice => "Usuario creado exitosamente."
else
redirect './signup', :error => "Ha ocurrido un error, intente nuevamente."
end
end
视图看起来像这样，signup.erb:
<form id="registro" action="/signup" method="POST">
<fieldset>
<legend>Ingrese sus datos</legend>
<label>Nombre
<input type="text" name="nombre">
</label>
<label>Cédula
<input type="text" maxlength="10" name="cedula">
</label>
<label>Contraseña
<input type="password" name="password">
</label>
<!-- TO-DO:
Dropdown list con los diferentes tipos de usuarios, i.e.: admin, secretario, etc.
-->
<input type="submit" id="registerButton" class="button small">Finalizar registro</a>
</fieldset>
</form>
每当我尝试创建新用户时，都会收到以下错误：
ArgumentError - wrong number of arguments (4 for 0..2)
考虑到 table 我尝试插入的值有 4 列，我不明白为什么会出现此错误。
任何能帮助我解决这个不便的见解都将不胜感激！
提前致谢。
ActiveRecord::new 方法只允许 2 个参数作为参数，它应该是一个散列。修复：
User.new(params[:nombre], params[:cedula], password_hash, "admin")
至：
User.new(nombre: params[:nombre], cedula: params[:cedula], password: password_hash, role: "admin")
你应该经常查看文档，在 99% 的情况下你可以找到问题：
New objects can be instantiated as either empty (pass no construction parameter) or pre-set with attributes but not yet saved (pass a hash with key names matching the associated table column names). In both instances, valid attribute keys are determined by the column names of the associated table – hence you can’t have attributes that aren’t part of the table columns.
new(attributes = nil, options = {})
示例：
# Instantiates a single new object
User.new(:first_name => 'Jamie')
# Instantiates a single new object using the :admin mass-assignment security role
User.new({ :first_name => 'Jamie', :is_admin => true }, :as => :admin)
# Instantiates a single new object bypassing mass-assignment security
User.new({ :first_name => 'Jamie', :is_admin => true }, :without_protection => true)