I get this error and for the life of me I can't figure out why. Help would be appreciated. :
error 3: error displayed after changes
error 4: after User.all.each do |user|
Error: Undefined method 'each' for nil: nilClass
my ruby/haml code is as follows
viewer code:
-# This file is app/views/projects/index.html.haml
%h1 All Project Tasks
= form_tag projects_path, :method => :get do
Include:
- #all_users.each do |user|
= user
= check_box_tag "users[#{user}]", 1, ("checked" if #filtered_users.find_index(user))
= submit_tag 'Refresh', :id => "users_submit"
%table#projects
%thead
%tr
%th{:class => ("hilite" if params[:sort] == "title")}= link_to "Title", {:controller => "projects", :sort => "title", :filter => #filtered_users.to_s}, :id => "title_header"
%th Task Details
%th Assigned Usertimot
%th{:class => ("hilite" if params[:sort] == "due_date")}= link_to "Due Date", {:controller => "projects", :sort => "due_date", :filter => #filtered_users.to_s}, :id => "due_date_header"
%tbody
- #projects.each do |project|
%tr
%td= project.title
%td= link_to "More about #{project.title}", project_path(project)
%td= project.user
%td= project.due_date.to_formatted_s(:long)
= link_to 'Add new project task', new_project_path
controller code:
class ProjectsController < ApplicationController
def show
id = params[:id] # retrieve project task ID from URI route
#project = Project.find(id) # look up project task by unique ID
# will render app/views/projects/show.<extension> by default
def index
#projects_users = Project.all_users
# remembered settings
if (params[:filter] == nil and params[:users] == nil and params[:sort] == nil and
(session[:filter] != nil or session[:users] != nil or session[:sort] != nil))
if (params[:filter] == nil and session[:filter] != nil)
params[:filter] = session[:filter]
end
if (params[:sort] == nil and session[:sort] != nil)
params[:sort] = session[:sort]
end
redirect_to projects_path(:filter => params[:filter], :sort => params[:sort], :users => params[:users])
else
if (params[:filter] != nil and params[:filter] != "[]")
#filtered_users = params[:filter].scan(/[\w-]+/)
session[:filter] = params[:filter]
else
#filtered_users = params[:users] ? params[:users].keys : []
session[:filter] = params[:users] ? params[:users].keys.to_s : nil
end
end
session[:sort] = params[:sort]
session[:users] = params[:users]
if (params[:sort] == "title")
if ( params[:users]or params[:filter] )
#projects = Project.find(:all, :order => "title")
end
end
if (params[:sort] == "due_date")
if ( params[:users]or params[:filter] )
#projects = Project.find(:all, :order => "due_date")
end
if (params[:sort] == nill)
if(params[:users] or params[:filter])
#projects = Project.all
end
end
end
end
def new
# default: render 'new' template
end
def create
#project = Project.create!(project_params)
flash[:notice] = "#{#project.title} was successfully created."
redirect_to projects_path
end
def edit
#project = Project.find params[:id]
end
def update
#project = Project.find params[:id]
#project.update_attributes!(project_params)
flash[:notice] = "#{#project.title} was successfully updated."
redirect_to project_path(#project)
end
def destroy
#project = Project.find(params[:id])
#project.destroy
flash[:notice] = "Project '#{#project.title}' deleted."
redirect_to projects_path
end
private
def project_params
params.require(:project).permit(:title, :description, :extended_description, :user, :due_date)
end
end
end
i understand that the spacing for haml may be a little off, just the nature of trying to format the code block thanks in advance!
viewer code:
class Project < ActiveRecord::Base
def self.all_users
allUsers = []
Project.all.each do |project|
if (allUsers.find_index(project.user) == nil)
allUsers.push(project.user)
end
end
return allUsers
end
end
You are probably getting the error on this line in your view:
#all_users.each do |user|
The reason for the error as I see it is that you don't have #all_users instantiated anywhere in your controller's index action method.
First switch #all_users to #projects_users. Also it appears that your all_users method in project.rb is overly complex and is returning nil. Try modifying project.rb to the following:
class Project < ActiveRecord::Base
def self.all_users
all.includes(:user).map(&:user).uniq
end
end
Undefined method 'each' for nil: nilClass
This error basically means you don't have any data in your variable.
In other languages, it would mean you've not delcared the variable. Because Ruby is object orientated, it will populate the variable with the nilClass class.
Many new Ruby devs are thrown by the "undefined method" exception message; it's the nilClass you have to look out for.
--
To explain the error properly, because Ruby is object orientated, every variable is actually a data object, represented by a class. In Rails, you can define these classes as models (User.find etc).
Unlike other languages, Ruby treats these objects as is -- it uses methods on them. Other languages fit data into functions, E.G PHP's each function:
#PHP
<$ each($people) $>
#Ruby
<% #people.each do |person| %>
Thus, the "no method" error basically means that Ruby cannot find the method you're calling on the nilClass. It throws developers because they think that "I have the x method on the User class", not realizing that the variable has been populated by the nilClass instead.
The short of it is that you have to either make your calls conditional, or populate the variable properly.
The error appears to be here:
#app/views/project/index.html.haml
#all_users.each do |user|
#app/controllers/projects_controller.rb
class ProjectsController < ApplicationController
def index
#projects_users = Project.all_users
end
end
You're not assigning #all_users at all
You're using an inefficient way to get "all users"
Here's what I'd do:
#app/controllers/projects_controller.rb
class ProjectsController < ApplicationController
def index
#users = Project.all_users
end
end
#app/models/project.rb
class Project < ActiveRecord::Base
scope :all_users, -> { joins(:users) } #-> this needs to be tested
end
#app/views/projects/index.haml
- #users.each do |user|
= user.name
I am pretty inexperienced with pure SQL, you'll be best referring to the joins documentation for a clearer perspective.
Related
wrong number of arguments (given 2, expected 1)
SportsController
class SportsController < ApplicationController
def index
#sport = Sport.all
#events, #errors = Bapi::Inplay.all(query)
end
private
def query
params[:query, {}]
end
end
Sport index.html.erb
<% #sports.each do |sport| %>
<% #events(:sport_id => sport.id).each_slice(2) do |events| %>
I want send each sport.id to #enevts instance variable
Edited :
When send query as hash in SportsController its work!!
class SportsController < ApplicationController
def index
#sport = Sport.all
query = {:sport_id => 1}
#events, #errors = Bapi::Inplay.all(query)
end
private
def query
params[:query, {}]
end
end
Index.html.erb
<% #sports.each do |sport| %>
<% #events.each_slice(2) do |events| %>
params is a hash and method :[] can accept only 1 argument.
def query
params[:query] || {} # Will return :query part or empty Hash if it has nothing
end
I've got a simple search form, in rails 4 app, that needs two params passed to be able to show relevant data.
I'm getting an 'Mysql2::Error: Unknown column 'data inputted' but the columns do exist. If I instead of '#search = Page.where(params[:one] && params[:two])' use '#search = Page.all' the data shows, but all of it shows.
Form
<%= form_tag(page_show_path, id: "search-form") do %>
<%= text_field_tag :one, params[:one], placeholder: "One" %>
<%= text_field_tag :two, params[:two], placeholder: "Two" %>
<%= submit_tag "Search", :name => nil %>
<% end %>
Model
def self.one(query)
where("one = ?", "%#{query}%")
end
def self.two(query)
where("two = ?", "%#{query}%")
end
Controller
def show
if (params[:one] && params[:two]).present?
#search = Page.where(params[:one] && params[:two])
else
redirect_to page_path, notice: "Not a valid combination"
end
end
You can Create and Use Scope.
scope :find_one_two, ->(query_one, query_two) { where("one = ? AND two = ? ", query_one, query_two) }
#search = Page.find_one_two(params[:one], params[:two])
OR
You can use.
#search = Page.where("one = ? AND two = ?", params[:one], params[:two])
def show
if (params[:one] && params[:two]).present?
#search = Page.where("one like ? AND two like ? ", "%#{params[:one]}%", "%#{params[:two]}%")
else
redirect_to page_path, notice: "Not a valid combination"
end
end
This may solve your problem.
I'm getting the following error...
pry("serp")> session[self.to_sym] = "closed"
NameError: undefined local variable or method `session' for "serp":String
...when I try to set a session variable from within a monkeypatch on the String class. (Necessary so I can track the progress of a job in delayed job in order to load my search results only when they are ready.)
How can I set a session variable there? Or is there a better solution?
My code...
/config/initializers/string.rb:
class String
def multisearch
result = PgSearch.multisearch(self)
session[self.to_sym] = "closed"
return result
end
end
/app/views/searches/show.html.haml:
- if #term.present? && session[#term.to_sym] == "open"
%h1 Search In Progress
# then show spinning wheel animation etc
- else
%h1 Search Results
= form_tag search_path, :method => :get do
= text_field_tag "term", "Search term"
= submit_tag "Search"
- unless #results.blank?
# then show the search results etc
**/app/views/layouts/application.html.haml:
!!!
%html
%head
- if #term.present? && session[#term.to_sym] == "open"
%meta{:content => "5", "http-equiv" => "refresh"}/
/app/controllers/searches_controller.rb:
class SearchesController < ApplicationController
respond_to :html
filter_access_to :all
def show
if #term = params[:term]
session[#term.to_sym] = "open"
#results = #term.delay.multisearch
# other stuff...
end
end
end
Pass the session as a parameter.
class String
def multisearch session
result = PgSearch.multisearch(self)
session[self.to_sym] = "closed"
return result
end
end
Then
#term.delay.multisearch(session)
The answer was to stop fighting Ruby's OO nature and to build a Search model that could own everything I needed to access.
/app/models/search.rb:
class Search < ActiveRecord::Base
serialize :results
def multisearch
results = PgSearch.multisearch(self.term).to_a
self.update_attributes :results => results, :status => "closed"
return results
end
end
** /app/controllers/searches_controller.rb**:
class SearchesController < ApplicationController
respond_to :html
def show
if params[:term].present?
#search = Search.find_or_create_by_term(params[:term])
if #search.status.blank?
#search.delay.multisearch
#search.status = "open"
#search.save
elsif #search.status == "closed"
#search.update_attributes :status => nil
end
end
end
end
/app/views/searches/show.html.haml:
- if #search.present? && #search.status == "open"
# progress bar etc
- else
= form_tag search_path, :method => :get do
= text_field_tag "term", "Search term"
= submit_tag "Search"
- if #search.present? && #search.status.nil?
- unless #search.results.blank?
# show the search results
/app/views/layouts/application.html.haml:
- if #search.present? && #search.status == "open"
%meta{:content => "5", "http-equiv" => "refresh"}/
I am getting undefined method `member' error in my following code
Pls tell where am i going wrong in the following code...
I have groups model in which i have created member method as follows
def member(groupid,userid)
#members = Membership.all
#members.each do |m|
if m.group_id == groupid and m.user_id == userid
return true
end
end
end
in my groups_controller index action :
def index
#group = Group.all
end
and inside my groups/index.html.haml i am calling this method at following line
- #group.reverse.each do |group|
%tr
%ul{:style=>"list-style-type:square"}
%td
%li= link_to group.groupname,group
- if member(#group.id,#current_user.id)
= link_to ' Join this group', {:controller => "memberships",
:action => "create",
:group_id => group.id},
:method => "post"
but when i run code i get undefined method `member' error
member is an instance method of Group. So you should change that line to
- if group.member(#group.id, #current_user.id)
But it doesn't need to be instance method. It doesn't use any state or anything. So, make it a class method.
class Group
def self.member(groupid,userid)
#members = Membership.all
#members.each do |m|
if m.group_id == groupid and m.user_id == userid
return true
end
end
end
end
And call it like this:
- if Group.member(#group.id, #current_user.id)
I'm developing an application that displays tabular data in many different areas and I find myself constantly using the same HTML table structure over and over. For example a particular table looks like this:
%table.zebra-striped#user-table{ :cellspacing => "0" }
%colgroup
%col{:id => "email"}
%col{:id => "username"}
%col{:id => "sign-in-count"}
%col{:id => "last-sign-in-at"}
%thead
%tr
%th{:id => "email-head", :scope => "col"} E-mail
%th{:id => "username-head", :scope => "col"} Username
%th{:id => "sign-in-count-head", :scope => "col"} Sign Ins
%th{:id => "last-sign-in-at-head", :scope => "col"} Last Sign In
%tbody
- #users.each do |user|
%tr{ :class => zebra }
%td
=h user.email
%td
=h user.username
%td
=h user.sign_in_count
%td
=h user.last_sign_in_at
Ideally, I would like to create some kind of helper method where I could do something like:
= custom_table_for #users do
= column :email
= column :username do |user|
= link_to user.username, user_path(user)
= column "Sign Ins", :sign_in_count
= column :last_sign_in_at
This way I can change the formatting of the data in the columns and the column header names if I'm not happy with default values, but have the table generated for me.
I suppose I could create a normal helper, but I'd have to use arrays and I have no idea how I could include custom data formatting per column.
active_admin has something similar to this which you can see here: http://activeadmin.info/docs/3-index-pages/index-as-table.html
Any leads or ideas would be greatly appreciated.
I just came up with this:
A few points:
The line #columns = [] is a reset so you can call it more than once.
The yield in the custom_table_for calls the block that you pass it.
The block in the column method is stored and called in custom_table_for if it is set.
I included a sample class to show the usage too.
please note I did this outside of a rails app and you almost certainly want to use http://api.rubyonrails.org/classes/ActionView/Helpers/TagHelper.html#method-i-content_tag instead of the p "<table>" this is merely for sample purposes when you run it in the console.
module TableHelper
def custom_table_for(items)
#columns = []
yield
p "<table>"
#columns.each do |c|
p "<th>#{c[:value]}</th>"
end
items.each do |e|
p "<tr>"
#columns.each do |c|
e[c[:name]] = c[:block].call(e[c[:name]]) if c[:block]
p "<td>#{e[c[:name]]}</td>"
end
p "</tr>"
end
p "</table>"
end
def column(name, value = nil, &block)
value = name unless value
#columns << {:name => name, :value => value, :block => block}
end
end
class ExampleTable
include TableHelper
def test
#users = [{:email => "Email 1", :username => "Test User"}, {:email => "Email 2", :username => "Test User 2"}]
custom_table_for #users do
column :email, "Email"
column :username do |user|
user.upcase
end
end
end
end
et = ExampleTable.new
et.test
UPDATE
I migrated this to rails to use content_tags
module TableHelper
def custom_table_for(items)
#columns = []
yield
content_tag :table do
thead + tbody(items)
end
end
def thead
content_tag :thead do
content_tag :tr do
#columns.each do |c|
concat(content_tag(:th, c[:value]))
end
end
end
end
def tbody(items)
content_tag :tbody do
items.each { |e|
concat(content_tag(:tr){
#columns.each { |c|
e[c[:name]] = c[:block].call(e[c[:name]]) if c[:block]
concat(content_tag(:td, e[c[:name]]))
}
})
}
end
end
def column(name, value = nil, &block)
value = name unless value
#columns << {:name => name, :value => value, :block => block}
end
end
To compliment #gazler's response, here's a way to make a table of a single resource-- column one for attribute names, column two for their values:
module TableHelper
#resource = nil
def simple_table_for(resource)
#resource = resource
content_tag :table do
content_tag :tbody do
yield
end
end
end
def row(key, label = nil, &block)
if key.is_a? String
label = key
end
content_tag(:tr) {
concat content_tag :td, label || key.capitalize
concat content_tag(:td ){
if block_given?
yield
else
#resource.send(key)
end
}
}
end
end