Download - Rails Helpers

7/31/2019 Rails Helpers

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Rails HelpersJohnson Liang / MrOrz


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Helpers


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Helper

link_to, stylesheet_link_tag,auto_link,

Named Helper posts_path, edit_post_url(:id)

Form Helper

form_for, text_field,


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http: / / ihower.t w/ rails3/ actionview-helpers.html

htt p:/ / blog.xdit e.net / posts/ 2011/ 12/ 08/ how-to-design-helpers/

htt p:/ / blog.xdit e.net / posts/ 2011/ 12/ 09/ how-to-design-helpers-2/

htt p:/ / blog.xdit e.net / posts/ 2012/ 01/ 15/ how-to-design-helper-3/
http://ihower.tw/rails3/actionview-helpers.htmlhttp://blog.xdite.net/posts/2011/12/08/how-to-design-helpers/http://blog.xdite.net/posts/2011/12/09/how-to-design-helpers-2/http://blog.xdite.net/posts/2012/01/15/how-to-design-helper-3/http://blog.xdite.net/posts/2012/01/15/how-to-design-helper-3/http://blog.xdite.net/posts/2011/12/09/how-to-design-helpers-2/http://blog.xdite.net/posts/2011/12/08/how-to-design-helpers/http://ihower.tw/rails3/actionview-helpers.html


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helper

view

rails consolehelper.

1.9.2-p290 :005 > helper.link_to 'Google', 'http://google.com', :target=>_blank

=> "Google"


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link_to(*args, &block)

htt p:/ / api. rubyonrails.org/ classes/ ActionView/ Helpers/ UrlHelper.html#method-i-l ink_to

Named helper, covered later
http://api.rubyonrails.org/classes/ActionView/Helpers/UrlHelper.htmlhttp://api.rubyonrails.org/classes/ActionView/Helpers/UrlHelper.htmlhttp://api.rubyonrails.org/classes/ActionView/Helpers/UrlHelper.htmlhttp://api.rubyonrails.org/classes/ActionView/Helpers/UrlHelper.htmlhttp://api.rubyonrails.org/classes/ActionView/Helpers/UrlHelper.htmlhttp://api.rubyonrails.org/classes/ActionView/Helpers/UrlHelper.html


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link_to(*args, &block)

htt p:/ / api. rubyonrails.org/ classes/ ActionView/ Helpers/ UrlHelper.html#method-i-l ink_to

Handled by jquery.ujs.js (the jquery-rails gem)
http://api.rubyonrails.org/classes/ActionView/Helpers/UrlHelper.htmlhttp://api.rubyonrails.org/classes/ActionView/Helpers/UrlHelper.htmlhttp://api.rubyonrails.org/classes/ActionView/Helpers/UrlHelper.htmlhttp://api.rubyonrails.org/classes/ActionView/Helpers/UrlHelper.htmlhttp://api.rubyonrails.org/classes/ActionView/Helpers/UrlHelper.htmlhttp://api.rubyonrails.org/classes/ActionView/Helpers/UrlHelper.html


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javascript_include_tag(*sources)

stylesheet_link_tag(*sources)

j s app/ assets/ j avascripts

css app/ assets/ stylesheets

http:/ / goo.gl/ J30Kg htt p:/ / goo.gl/ OoluN
http://goo.gl/J30Kghttp://goo.gl/OoluNhttp://goo.gl/OoluNhttp://goo.gl/J30Kg


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image_tag(source, opt ions = {})

app/ assets/ images

htt p:/ / api.rubyonrails.org/ classes/ Act ionView/ Helpers/ AssetTagHelper.html
http://api.rubyonrails.org/classes/ActionView/Helpers/AssetTagHelper.htmlhttp://api.rubyonrails.org/classes/ActionView/Helpers/AssetTagHelper.html


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javascript_include_tagstylesheet_link_tag

image_tag

WHY?


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javascript_include_tagstylesheet_link_tag

image_tag

asset server

Product ion mode


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truncate(text, options = {})

simple_format (text, html_options={}, options={})

html

htt p:/ / api. rubyonrails.org/ classes/ ActionView/ Helpers/ TextHelper.html
http://api.rubyonrails.org/classes/ActionView/Helpers/TextHelper.htmlhttp://api.rubyonrails.org/classes/ActionView/Helpers/TextHelper.html


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ht tp:/ / ihower.t w/ rails3/ rout ing.html
http://ihower.tw/rails3/routing.htmlhttp://ihower.tw/rails3/routing.html


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*_url, *_path

controller view

rails consoleapp.

1.9.2-p290 :019 > app.posts_path

=> "/posts"

1.9.2-p290 :020 > app.posts_url

=> "http://www.example.com/posts"


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Named Routesrake routes

RouteName HTTP verbMatches all if empty URL patternto matchRoutingparameters


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Named Helper

_path_url

posts_path

=> "/posts"

posts_url

=> "http://www.example.com/posts"

edit_post_comment_path :id=>4, :post_id=>2

=> "/posts/2/comments/4/edit"


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htt p:/ / ihower.t w/ rails3/ actionview-helpers.html

htt p:/ / guides.rubyonrails.org/ form_helpers.html
http://ihower.tw/rails3/actionview-helpers.htmlhttp://guides.rubyonrails.org/form_helpers.htmlhttp://guides.rubyonrails.org/form_helpers.htmlhttp://ihower.tw/rails3/actionview-helpers.html


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form_tag

button_tag

check_box_tag

field_set_tag

file_field_tag

hidden_field_tag

label_tag

password_field_tag

radio_button_tag

search_field_tagsubmit_tag

text_area_tag

text_field_tag

FormHelper FormTagHelper

form_for

check_box

file_field

hidden_field

label

password_field

radio_button

search_field

text_area

text_field


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FormHelper FormTagHelper

form_for CSRF name

form_tag CSRF tag form_forFormHelper FormHelper

FormTagHelper name


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.html.erb .html

IE UTF-8 bug

CSRF

style

hash

/people"


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.html params[]

params # =>

{

:utf8 => ,

:authenticity_token => ,:person => {

:first_name => ,

:last_name => ,

:biography => ,

(:admin => true)

},

:commit => Create Post,

:controller => person

}

/people"

@person =

Person.new(params[:person])

attr_accessible


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FormHelper

@post newid

@post

@post

FormHelpername post[xxx]

Named Helper html


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References Helper

htt p:/ / ihower. tw/ rails3/ actionview-helpers.html htt p:/ / blog.xdite.net / posts/ 2011/ 12/ 08/ how-to-design-helpers/ htt p:/ / blog.xdite.net / posts/ 2011/ 12/ 09/ how-to-design-helpers-2/ htt p:/ / blog.xdite.net / posts/ 2012/ 01/ 15/ how-to-design-helper-3/

Form Helpers htt p:/ / ihower. tw/ rails3/ actionview-helpers.html http:/ / guides.rubyonrails.org/ form_helpers.html

Named Route Helpers ht tp:/ / ihower.t w/ rails3/ rout ing.html

Test ing Helpers Under Rails Console http:/ / stackoverflow.com/ quest ions/ 151030/ how-do-i-call -controller-view-

methods-from-the-console-in-rails http:/ / stackoverflow.com/ quest ions/ 4400888/ rails-call ing-a-controller-act ion-

from-the-consolehttp:/ / stackoverf low.com/ quest ions/ 2846247/ rails-check-output-of-path-helper-from-console
http://ihower.tw/rails3/actionview-helpers.htmlhttp://blog.xdite.net/posts/2011/12/08/how-to-design-helpers/http://blog.xdite.net/posts/2011/12/09/how-to-design-helpers-2/http://blog.xdite.net/posts/2012/01/15/how-to-design-helper-3/http://ihower.tw/rails3/actionview-helpers.htmlhttp://guides.rubyonrails.org/form_helpers.htmlhttp://ihower.tw/rails3/routing.htmlhttp://stackoverflow.com/questions/151030/how-do-i-call-controller-view-methods-from-the-console-in-railshttp://stackoverflow.com/questions/151030/how-do-i-call-controller-view-methods-from-the-console-in-railshttp://stackoverflow.com/questions/151030/how-do-i-call-controller-view-methods-from-the-console-in-railshttp://stackoverflow.com/questions/4400888/rails-calling-a-controller-action-from-the-consolehttp://stackoverflow.com/questions/2846247/rails-check-output-of-path-helper-from-consolehttp://stackoverflow.com/questions/2846247/rails-check-output-of-path-helper-from-consolehttp://stackoverflow.com/questions/2846247/rails-check-output-of-path-helper-from-consolehttp://stackoverflow.com/questions/2846247/rails-check-output-of-path-helper-from-consolehttp://stackoverflow.com/questions/2846247/rails-check-output-of-path-helper-from-consolehttp://stackoverflow.com/questions/2846247/rails-check-output-of-path-helper-from-consolehttp://stackoverflow.com/questions/2846247/rails-check-output-of-path-helper-from-consolehttp://stackoverflow.com/questions/2846247/rails-check-output-of-path-helper-from-consolehttp://stackoverflow.com/questions/2846247/rails-check-output-of-path-helper-from-consolehttp://stackoverflow.com/questions/2846247/rails-check-output-of-path-helper-from-consolehttp://stackoverflow.com/questions/2846247/rails-check-output-of-path-helper-from-consolehttp://stackoverflow.com/questions/2846247/rails-check-output-of-path-helper-from-consolehttp://stackoverflow.com/questions/2846247/rails-check-output-of-path-helper-from-consolehttp://stackoverflow.com/questions/2846247/rails-check-output-of-path-helper-from-consolehttp://stackoverflow.com/questions/2846247/rails-check-output-of-path-helper-from-consolehttp://stackoverflow.com/questions/2846247/rails-check-output-of-path-helper-from-consolehttp://stackoverflow.com/questions/2846247/rails-check-output-of-path-helper-from-consolehttp://stackoverflow.com/questions/4400888/rails-calling-a-controller-action-from-the-consolehttp://stackoverflow.com/questions/4400888/rails-calling-a-controller-action-from-the-consolehttp://stackoverflow.com/questions/151030/how-do-i-call-controller-view-methods-from-the-console-in-railshttp://stackoverflow.com/questions/151030/how-do-i-call-controller-view-methods-from-the-console-in-railshttp://ihower.tw/rails3/routing.htmlhttp://guides.rubyonrails.org/form_helpers.htmlhttp://ihower.tw/rails3/actionview-helpers.htmlhttp://blog.xdite.net/posts/2012/01/15/how-to-design-helper-3/http://blog.xdite.net/posts/2011/12/09/how-to-design-helpers-2/http://blog.xdite.net/posts/2011/12/08/how-to-design-helpers/http://ihower.tw/rails3/actionview-helpers.html