301 lines
14 KiB
Ruby
301 lines
14 KiB
Ruby
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require 'action_view/helpers'
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require 'active_support/i18n'
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require 'active_support/core_ext/enumerable'
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require 'active_support/core_ext/object/blank'
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module ActionView
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module Helpers
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# The Active Record Helper makes it easier to create forms for records kept in instance variables. The most far-reaching is the +form+
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# method that creates a complete form for all the basic content types of the record (not associations or aggregations, though). This
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# is a great way of making the record quickly available for editing, but likely to prove lackluster for a complicated real-world form.
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# In that case, it's better to use the +input+ method and the specialized +form+ methods in link:classes/ActionView/Helpers/FormHelper.html
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module DynamicForm
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# Returns a default input tag for the type of object returned by the method. For example, if <tt>@post</tt>
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# has an attribute +title+ mapped to a +VARCHAR+ column that holds "Hello World":
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#
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# input("post", "title")
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# # => <input id="post_title" name="post[title]" size="30" type="text" value="Hello World" />
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def input(record_name, method, options = {})
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InstanceTag.new(record_name, method, self).to_tag(options)
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end
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# Returns an entire form with all needed input tags for a specified Active Record object. For example, if <tt>@post</tt>
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# has attributes named +title+ of type +VARCHAR+ and +body+ of type +TEXT+ then
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#
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# form("post")
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#
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# would yield a form like the following (modulus formatting):
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#
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# <form action='/posts/create' method='post'>
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# <p>
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# <label for="post_title">Title</label><br />
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# <input id="post_title" name="post[title]" size="30" type="text" value="Hello World" />
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# </p>
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# <p>
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# <label for="post_body">Body</label><br />
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# <textarea cols="40" id="post_body" name="post[body]" rows="20"></textarea>
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# </p>
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# <input name="commit" type="submit" value="Create" />
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# </form>
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#
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# It's possible to specialize the form builder by using a different action name and by supplying another
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# block renderer. For example, if <tt>@entry</tt> has an attribute +message+ of type +VARCHAR+ then
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#
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# form("entry",
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# :action => "sign",
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# :input_block => Proc.new { |record, column|
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# "#{column.human_name}: #{input(record, column.name)}<br />"
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# })
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#
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# would yield a form like the following (modulus formatting):
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#
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# <form action="/entries/sign" method="post">
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# Message:
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# <input id="entry_message" name="entry[message]" size="30" type="text" /><br />
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# <input name="commit" type="submit" value="Sign" />
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# </form>
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#
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# It's also possible to add additional content to the form by giving it a block, such as:
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#
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# form("entry", :action => "sign") do |form|
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# form << content_tag("b", "Department")
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# form << collection_select("department", "id", @departments, "id", "name")
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# end
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#
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# The following options are available:
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#
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# * <tt>:action</tt> - The action used when submitting the form (default: +create+ if a new record, otherwise +update+).
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# * <tt>:input_block</tt> - Specialize the output using a different block, see above.
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# * <tt>:method</tt> - The method used when submitting the form (default: +post+).
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# * <tt>:multipart</tt> - Whether to change the enctype of the form to "multipart/form-data", used when uploading a file (default: +false+).
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# * <tt>:submit_value</tt> - The text of the submit button (default: "Create" if a new record, otherwise "Update").
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def form(record_name, options = {})
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record = instance_variable_get("@#{record_name}")
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record = convert_to_model(record)
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options = options.symbolize_keys
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options[:action] ||= record.persisted? ? "update" : "create"
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action = url_for(:action => options[:action], :id => record)
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submit_value = options[:submit_value] || options[:action].gsub(/[^\w]/, '').capitalize
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contents = form_tag({:action => action}, :method =>(options[:method] || 'post'), :enctype => options[:multipart] ? 'multipart/form-data': nil)
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contents.safe_concat hidden_field(record_name, :id) if record.persisted?
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contents.safe_concat all_input_tags(record, record_name, options)
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yield contents if block_given?
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contents.safe_concat submit_tag(submit_value)
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contents.safe_concat('</form>')
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end
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# Returns a string containing the error message attached to the +method+ on the +object+ if one exists.
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# This error message is wrapped in a <tt>DIV</tt> tag by default or with <tt>:html_tag</tt> if specified,
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# which can be extended to include a <tt>:prepend_text</tt> and/or <tt>:append_text</tt> (to properly explain
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# the error), and a <tt>:css_class</tt> to style it accordingly. +object+ should either be the name of an
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# instance variable or the actual object. The method can be passed in either as a string or a symbol.
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# As an example, let's say you have a model <tt>@post</tt> that has an error message on the +title+ attribute:
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#
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# <%= error_message_on "post", "title" %>
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# # => <div class="formError">can't be empty</div>
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#
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# <%= error_message_on @post, :title %>
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# # => <div class="formError">can't be empty</div>
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#
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# <%= error_message_on "post", "title",
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# :prepend_text => "Title simply ",
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# :append_text => " (or it won't work).",
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# :html_tag => "span",
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# :css_class => "inputError" %>
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# # => <span class="inputError">Title simply can't be empty (or it won't work).</span>
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def error_message_on(object, method, *args)
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options = args.extract_options!
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unless args.empty?
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ActiveSupport::Deprecation.warn('error_message_on takes an option hash instead of separate ' +
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'prepend_text, append_text, html_tag, and css_class arguments', caller)
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options[:prepend_text] = args[0] || ''
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options[:append_text] = args[1] || ''
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options[:html_tag] = args[2] || 'div'
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options[:css_class] = args[3] || 'formError'
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end
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options.reverse_merge!(:prepend_text => '', :append_text => '', :html_tag => 'div', :css_class => 'formError')
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object = convert_to_model(object)
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if (obj = (object.respond_to?(:errors) ? object : instance_variable_get("@#{object}"))) &&
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(errors = obj.errors[method]).presence
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content_tag(options[:html_tag],
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(options[:prepend_text].html_safe << errors.first).safe_concat(options[:append_text]),
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:class => options[:css_class]
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)
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else
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''
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end
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end
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# Returns a string with a <tt>DIV</tt> containing all of the error messages for the objects located as instance variables by the names
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# given. If more than one object is specified, the errors for the objects are displayed in the order that the object names are
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# provided.
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#
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# This <tt>DIV</tt> can be tailored by the following options:
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#
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# * <tt>:header_tag</tt> - Used for the header of the error div (default: "h2").
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# * <tt>:id</tt> - The id of the error div (default: "errorExplanation").
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# * <tt>:class</tt> - The class of the error div (default: "errorExplanation").
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# * <tt>:object</tt> - The object (or array of objects) for which to display errors,
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# if you need to escape the instance variable convention.
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# * <tt>:object_name</tt> - The object name to use in the header, or any text that you prefer.
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# If <tt>:object_name</tt> is not set, the name of the first object will be used.
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# * <tt>:header_message</tt> - The message in the header of the error div. Pass +nil+
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# or an empty string to avoid the header message altogether. (Default: "X errors
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# prohibited this object from being saved").
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# * <tt>:message</tt> - The explanation message after the header message and before
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# the error list. Pass +nil+ or an empty string to avoid the explanation message
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# altogether. (Default: "There were problems with the following fields:").
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#
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# To specify the display for one object, you simply provide its name as a parameter.
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# For example, for the <tt>@user</tt> model:
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#
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# error_messages_for 'user'
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#
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# You can also supply an object:
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#
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# error_messages_for @user
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#
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# This will use the last part of the model name in the presentation. For instance, if
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# this is a MyKlass::User object, this will use "user" as the name in the String. This
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# is taken from MyKlass::User.model_name.human, which can be overridden.
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#
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# To specify more than one object, you simply list them; optionally, you can add an extra <tt>:object_name</tt> parameter, which
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# will be the name used in the header message:
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#
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# error_messages_for 'user_common', 'user', :object_name => 'user'
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#
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# You can also use a number of objects, which will have the same naming semantics
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# as a single object.
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#
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# error_messages_for @user, @post
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#
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# If the objects cannot be located as instance variables, you can add an extra <tt>:object</tt> parameter which gives the actual
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# object (or array of objects to use):
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#
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# error_messages_for 'user', :object => @question.user
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#
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# NOTE: This is a pre-packaged presentation of the errors with embedded strings and a certain HTML structure. If what
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# you need is significantly different from the default presentation, it makes plenty of sense to access the <tt>object.errors</tt>
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# instance yourself and set it up. View the source of this method to see how easy it is.
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def error_messages_for(*params)
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options = params.extract_options!.symbolize_keys
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objects = Array.wrap(options.delete(:object) || params).map do |object|
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object = instance_variable_get("@#{object}") unless object.respond_to?(:to_model)
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object = convert_to_model(object)
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if object.class.respond_to?(:model_name)
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options[:object_name] ||= object.class.model_name.human.downcase
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end
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object
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end
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objects.compact!
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count = objects.inject(0) {|sum, object| sum + object.errors.count }
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unless count.zero?
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html = {}
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[:id, :class].each do |key|
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if options.include?(key)
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value = options[key]
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html[key] = value unless value.blank?
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else
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html[key] = 'errorExplanation'
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end
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end
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options[:object_name] ||= params.first
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I18n.with_options :locale => options[:locale], :scope => [:errors, :template] do |locale|
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header_message = if options.include?(:header_message)
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options[:header_message]
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else
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locale.t :header, :count => count, :model => options[:object_name].to_s.gsub('_', ' ')
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end
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message = options.include?(:message) ? options[:message] : locale.t(:body)
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error_messages = objects.sum do |object|
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object.errors.full_messages.map do |msg|
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content_tag(:li, msg)
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end
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end.join.html_safe
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contents = ''
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contents << content_tag(options[:header_tag] || :h2, header_message) unless header_message.blank?
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contents << content_tag(:p, message) unless message.blank?
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contents << content_tag(:ul, error_messages)
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content_tag(:div, contents.html_safe, html)
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end
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else
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''
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end
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end
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private
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def all_input_tags(record, record_name, options)
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input_block = options[:input_block] || default_input_block
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record.class.content_columns.collect{ |column| input_block.call(record_name, column) }.join("\n")
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end
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def default_input_block
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Proc.new { |record, column| %(<p><label for="#{record}_#{column.name}">#{column.human_name}</label><br />#{input(record, column.name)}</p>) }
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end
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module InstanceTagMethods
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def to_tag(options = {})
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case column_type
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when :string
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field_type = @method_name.include?("password") ? "password" : "text"
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to_input_field_tag(field_type, options)
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when :text
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to_text_area_tag(options)
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when :integer, :float, :decimal
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to_input_field_tag("text", options)
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when :date
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to_date_select_tag(options)
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when :datetime, :timestamp
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to_datetime_select_tag(options)
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when :time
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to_time_select_tag(options)
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when :boolean
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to_boolean_select_tag(options)
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end
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end
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def column_type
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object.send(:column_for_attribute, @method_name).type
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end
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end
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module FormBuilderMethods
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def error_message_on(method, *args)
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@template.error_message_on(@object || @object_name, method, *args)
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end
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def error_messages(options = {})
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@template.error_messages_for(@object_name, objectify_options(options))
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end
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end
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end
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class InstanceTag
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include DynamicForm::InstanceTagMethods
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end
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class FormBuilder
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include DynamicForm::FormBuilderMethods
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end
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end
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end
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I18n.load_path << File.expand_path("../../locale/en.yml", __FILE__)
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