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merb-helpers
=================
A plugin for the Merb Web framework that provides different view helpers.
To use this plugin in merb in your app
edit:
./Gemfile
add the li:
gem "merb-helpers"
run:
gem bundle
# TODO: describe date_time_helpers, form_helpers, tag_helpers
form_helpers
------------
* +delete_button+. If you want to delete an object, you should call the delete method on the object's controller.
You should not use a simple link to your action, instead you should make a DELETE request.
To help you doing that, you can use the delete_button method as follows:
<%= delete_button(@comment) %>
The delete_button helper has many options, first thing, you can pass an object or an url:
<%= delete_button(url(:comment, @comment)) %>
This helper creates a form with a submit button.
You can pass many arguments to the delete_button helper. The first thing you might want to do is to change the
default button text.
<%= delete_button(@comment), "Remove this comment by #{@comment.author.name}" %>
You can also pass the usual helper params to specify a class to use for instance:
<%= delete_button(@comment, nil, :class => 'custom-class') %>
See usage in specs: spec/fixture/app/views/delete_button_specs
numeric helpers
---------------
Numeric helpers extend numeric instances, in lay terms: numbers.
* +minutes_to_hours+ converts a +numeric+ value representing minutes into a string representing an hour value
315.minutes_to_hours # => "05:15"
* +two_digits+ formats a +number+ into a two digit string. Basically it prepends an integer to a 2 digits string.
3.two_digits # => "03"
* +with_delimiter+, this method formats a number with grouped thousands
12345678.with_delimiter # => "12,345,678"
* +with_precison+, this method formats a number with a level of precision
111.2345.with_precision # => "111.235"
* +to_currency, this method formats a number into a currency value using a delimited and a set precision
1234567890.506.to_currency # => "$1,234,567,890.51"
(For usage example look at spec/numeric_exlib.rb)
Overwriting the default formating options:
One can overwrite the default settings by passing the name or of the format used and a hash representing the settings to overwrite.
Each method mentioned above has some format settings you can overwrite:
* +with_delimiter+
* :delimiter - Overwrites the thousands delimiter.
* :separator - Overwrites the separator between the units.
* +with_precision+
* :precision - Overwrites the level of precision
* :separator - Overwrites the separator between the units
* :delimiter - Overwrites the thousands delimiter
* +with_currency+
* :precision - Sets the level of precision
* :unit - Sets the denomination of the currency
* :format - Sets the format of the output string (defaults to "%u%n"). The field types are:
* %u The currency unit
* %n The number
Usage example:
1234567890.506.to_currency(:default, :unit => '£') # => "£1,234,567,890.51"
merb_helpers comes with a very limited set of formats you can use, here is an example:
1234567890.50.to_currency(:uk) # => "£1,234,567,890.50"
Formats are just a hash of settings used by the plugin, here is the default format:
:us => {
:number => {
:precision => 3,
:delimiter => ',',
:separator => '.'
},
:currency => {
:unit => '$',
:format => '%u%n',
:precision => 2
}
}
If you wish to add a new format you can easily do that as follows:
custom_format_to_add = { :custom_name => {
:number => {
:precision => 3,
:delimiter => ',',
:separator => '.'
},
:currency => {
:unit => 'Merbollars',
:format => '%n %u',
:precision => 2
}
}
}
Numeric::Transformer.add_format(custom_format_to_add)
You can then call the format like that:
1234567890.to_currency(:custom_name) # => "1,234,567,890.00 Merbollars"
After adding a custom format, you can set it as the default format:
Numeric::Transformer.change_default_format(:custom_name)
You can set this things up in your before/after app load block in the config/init.rb file.
Formating a Date or Time instance
---------------
Usage examples: spec/merb_helpers_date_time_spec.rb
Time.now.formatted(:db) # => "2008-09-21 02:07:31"
Time.now.formatted(:long) # => "September 21, 2008 02:08"
You can also add your own format:
Date.add_format(:matt, "%H:%M:%S %Y-%m-%d")
And use is as a default format:
Time.now.formatted(:matt) # => "02:09:18 2008-09-21"
Representation of time difference
-------------------
Usage examples: spec/merb_helpers_date_time_spec.rb
* Relative time:
Let's imagine that we are the June 1st 2007 at 11am UTC
relative_date(Time.now.utc) # => "today"
relative_date(1.day.ago.utc) # => 'yesterday'
relative_date(1.day.from_now.utc) # => 'tomorrow'
relative_date(Time.utc(2005, 11, 15)) # => 'Nov 15th, 2005' (date with the year since it's not this year)
relative_date(Time.utc(2007, 11, 15)) # => 'Nov 15th' (date without the year this the passed date is this year)
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