class Marten::Handlers::Schema

Overview

Handler allowing to process a form through the use of a schema.

This handler can be used to process a form and validate its data through the use of a schema. It is expected that the handler will be accessed through a GET request first: when this happens the configured template is rendered and displayed, and the configured schema which is initialized can be accessed from the template context in order to render a form for example. When the form is submitted via a POST request, the configured schema is validated using the form data. If the data is valid, the handler returns an HTTP redirect to a configured success URL.

class MyFormHandler < Marten::Handlers::Schema
  schema MyFormSchema
  template_name "my_form.html"
  success_route_name "my_form_success"
end

It should be noted that the redirect response issued will be a 302 (found).

The schema used to perform the validation can be defined through the use of the #schema macro. Alternatively, the #schema_class method can also be overridden to dynamically define the schema class as part of the request handling.

The #template_name class method allows to define the name of the template to use to render the schema while the #success_route_name method can be used to specify the name of a route to redirect to once the schema has been validated. Alternatively, the #sucess_url class method can be used to provide a raw URL to redirect to. The same method can also be overridden at the instance level in order to rely on a custom logic to generate the sucess URL to redirect to.

Direct Known Subclasses

Defined in:

marten/handlers/schema.cr

Class Method Summary

Macro Summary

Instance Method Summary

Instance methods inherited from class Marten::Handlers::Template

context context, get get

Class methods inherited from class Marten::Handlers::Template

template_name : String | Nil template_name

Instance methods inherited from module Marten::Handlers::Rendering

get_response(content) get_response, render_template(context : Hash | NamedTuple | Nil | Marten::Template::Context) render_template, render_to_response(context : Hash | NamedTuple | Nil | Marten::Template::Context) render_to_response, template_name : String template_name

Instance methods inherited from class Marten::Handlers::Base

delete delete, dispatch : Marten::HTTP::Response dispatch, get get, head(status : Int32) : HTTP::Response
head
head
, json(raw_json : String, status = 200)
json(serializable, status = 200)
json
, options options, params : Hash(String, Int16 | Int32 | Int64 | Int8 | String | UInt16 | UInt32 | UInt64 | UInt8 | UUID) params, patch patch, post post, put put, redirect(url : String, permanent = false) redirect, render(template_name : String, context : Hash | NamedTuple | Nil | Marten::Template::Context = nil, content_type = HTTP::Response::DEFAULT_CONTENT_TYPE, status = 200) render, request : Marten::HTTP::Request request, respond(streamed_content : Iterator(String), content_type = HTTP::Response::DEFAULT_CONTENT_TYPE, status = 200)
respond(content = "", content_type = HTTP::Response::DEFAULT_CONTENT_TYPE, status = 200)
respond
, response : Marten::HTTP::Response? response, response! response!, reverse(*args, **options)
reverse(*args, **options, &)
reverse
, trace trace

Constructor methods inherited from class Marten::Handlers::Base

new(request : HTTP::Request, params : ParamsHash)
new(request : HTTP::Request, **kwargs)
new

Class methods inherited from class Marten::Handlers::Base

content_security_policy_block content_security_policy_block, http_method_names
http_method_names(*method_names : String | Symbol)
http_method_names

Instance methods inherited from module Marten::Handlers::Session

session(*args, **options)
session(*args, **options, &)
session

Instance methods inherited from module Marten::Handlers::RequestForgeryProtection

get_csrf_token get_csrf_token, referer_trusted? referer_trusted?

Instance methods inherited from module Marten::Handlers::Flash

flash(*args, **options)
flash(*args, **options, &)
flash

Instance methods inherited from module Marten::Handlers::Cookies

cookies(*args, **options)
cookies(*args, **options, &)
cookies

Macros inherited from module Marten::Handlers::Callbacks

after_dispatch(*names) after_dispatch, before_dispatch(*names) before_dispatch

Class Method Detail

def self.success_route_name(success_route_name : String | Nil) #

Allows to set the route name that should be resolved to produce the URL to when processing a valid schema.


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def self.success_route_name : String | Nil #

Returns the route name that should be resolved to produce the URL to redirect to when processing a valid schema.

Defaults to nil.


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def self.success_url(success_url : String | Nil) #

Allows to configure a raw URL to redirect to when processing a valid schema.


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def self.success_url : String | Nil #

Returns the configured raw URL to redirect when processing a valid schema.

Defaults to nil.


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Macro Detail

macro schema(schema_klass) #

Allows to configure the schema class that should be used to process request data.


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Instance Method Detail

def context #
Description copied from class Marten::Handlers::Template

Returns a hash containing the template context or nil.

The default implementation returns nil.


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def initial_data #

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def post #
Description copied from class Marten::Handlers::Base

Handles a POST HTTP request and returns a Marten::HTTP::Response object.

The default implementation will return a 405 (not allowed) response.


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def process_invalid_schema #

Produces the response when the processed schema is invalid.

By default, this will render the configured template and return a corresponding HTTP response.


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def process_valid_schema #

Produces the response when the processed schema is valid.

By default, this will return a 302 redirect targetting the configured success URL.


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def put #
Description copied from class Marten::Handlers::Base

Handles a PUT HTTP request and returns a Marten::HTTP::Response object.

The default implementation will return a 405 (not allowed) response.


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def schema #

Returns the schema, initialized using the request data.


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def schema_class #

Returns the schema class that should be used by the handler.


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def success_url #

Returns the URL to redirect to after the schema has been validated and processed.

By default, the URL will be determined from the configured #success_url and #success_route_name values. This method can be overridden on subclasses in order to define any arbitrary logics that might be necessary in order to determine the schema success URL.


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