11: All About Helpers in Java

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11: All About Helpers
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does contain some useful helper for reporting validation errors in your forms that you will use on a regular basis Note that as of Rails 3 you must install the following official plugin in order to use this module
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rails plugin install git://githubcom/rails/dynamic_formgit
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1111 Reporting Validation Errors
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The error_message_on and error_messages_for methods help you to add formatted validation error information to your templates in a consistent fashion
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error message on(object, method, *options)
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Returns a div tag containing the error message attached to the specified method on the object, if one exists It s useful for showing validation errors inline next to the corresponding form field The object argument of the method can be an actual object reference or a symbol corresponding to the name of an instance variable The method should be a symbol corresponding to the name of the attribute on the object for which to render an error message The contents can be specialized with options for pre- and post-text and custom CSS class
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:prepend text => string Fragment to prepend to error messages generated :append text => string Fragment to append to error messages generated :css class => class name CSS class name for div generated wrapping the error
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message Defaults to formError Use of this method is common when the user-interface requirements specify individual validation messages per input field of a form, as in the following real-life example:
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form_field field_label %spanrequired * %label First Name textual = formtext_field :first_name = formerror_message_on :first_name
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As in the example, the error_message_on helper is most commonly accessed via the form block variable of form_for and its variants When used via the form variable, you leave off the first argument (specifying the object) since it s implied
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111 ActiveModelHelper
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error messages for(*params)
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Returns a div tag containing all of the error messages for all of the objects held in instance variables identified as parameters
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= form_for @person do |form| = formerror_messages textfield = formlabel :name, "Name" = formtext_field :name
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As in the example, the error_message_for helper is most commonly accessed via the form block variable of form_for and its variants When used via the form variable, it is called error_messages and you leave off the first argument (specifying the object) since it s implied This method is used by Rails scaffolding, but rarely in real production applications The Rails API documentation advises you to use this method s implementation as inspiration to meet your own requirements:
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This is a prepackaged presentation of the errors with embedded strings and a certain HTML structure If what you need is significantly different from the default presentation, it makes plenty of sense to access the objecterrors instance yourself and set it up View the source of this method to see how easy it is
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We ll go ahead and reproduce the source of the method here with the warning that you should not try to use it as inspiration unless you have a good grasp of Ruby! On the other hand, if you have time to study the way that this method is implemented, it will definitely teach you a lot about the way that Rails is implemented, which is its own distinctive flavor of Ruby
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def error_messages_for(*params) options = paramsextract_options!symbolize_keys objects = Arraywrap(optionsdelete(:object) || params)map do |object| obj = instance_variable_get("@#{object}") unless objrespond_to (:to_model) obj = convert_to_model(obj) if objclassrespond_to (:model_name) options[:object_name] ||= objclassmodel_namehumandowncase end obj end objectscompact! count = objectsinject(0) {|sum, object| sum + objecterrorscount }
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11: All About Helpers
unless countzero html = {} [:id, :class]each do |key| if optionsinclude (key) value = options[key] html[key] = value unless valueblank else html[key] = 'errorExplanation' end end options[:object_name] ||= paramsfirst I18nwith_options :locale => options[:locale], :scope => [:errors, :template] do |locale| header_message = if optionsinclude (:header_message) options[:header_message] else localet :header, :count => count, :model => options[:object_name]to_sgsub('_', ' ') end message = optionsinclude (:message) options[:message] : localet(:body) error_messages = objectssum do |object| objecterrorsfull_messagesmap do |msg| content_tag(:li, ERB::Utilhtml_escape(msg)) end endjoin contents = '' contents << content_tag(options[:header_tag] || :h2, header_message) unless header_messageblank contents << content_tag(:p, message) unless messageblank contents << content_tag(:ul, error_messages) content_tag(:div, contents, html) end else '' end end