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Terra is an HTML form generator.


Configure your form with a Ruby DSL like so.

form =
form.configure do
  text :name, "Name"
  text :email, "Email address"

  fieldset :options, "Options" {
    textarea :body, "Body", :class => "hello"
    select   :type, "Type",
      :options => {
        :red => "Red",
        :blue => "Blue"


The syntax to define fields is:

text :id, "Field name", { options_hash }

Where text is the type of field, :id is the name of the field, "Field name" is what's to be displayed, and { options_hash } is an optional list of settings. The field type can be any of text|textarea|select|checkbox.


You'll then be able to use it in your views like so:

- form.fieldsets.each do |set|

  -# The fieldset title
  %h3= set.to_s

  -# Form fields (generates <p>..<label>..<input> for each field)
  - set.fields.each do |field|
    = field.to_html

Some methods

Here are some more useful methods:

form.fieldsets                 # Returns an array of fieldsets
set = form.fieldset(:default)  # Returns a fieldset by name

set.fields                # Returns a fieldset's fields
set.to_html               # Returns <fieldset>..</fieldset> HTML
set.to_html(object)       # Same as above, but tries to get data from `object.field_name`                  # Returns the name of the field
field = set.field(:name)  # Returns a field by name

field.to_html             # <p>..<label>..<input>..</p>
field.to_html(val)        # Like above, but with a certain value
field.input_html          # just <input>
field.label_html          # just <label>

No, there's no form.to_html. Geez, don't even think about it-- just render each of the fields/fieldsets.

In practice

%form{:method => 'post', :action => '/save'}
  - form.fieldsets.each do |set|
    !~ set.to_html(@object)

    %button{:type => 'submit'} Save

# HAML tip: use !~ instead of = to have your textareas
# flow correctly by supressing HAML's extra whitespaces.


= form.fieldsets.first.to_html
= form.fieldsets.first.fields.first.to_html

= form.fieldset(:default).to_html
= form.fieldset(:default).field(:name).to_html
= form.fieldset(:default).field(:name).to_html("Hello") # value

Using in Aura

In your models, simply use the form method to enclose the Terra form DSL in.

class BlogPost < Model
  form {
    text :title, "Title"
    text :body,  "Body"

You'll then be able to access it like so:

  • BlogPost.form
  • BlogPost.form.fieldsets

In Aura, by default, if you model uses the editable plugin, simply define a form and you'll have new/edit pages in the admin for your model, automagically. (plugin :aura_editable)

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