Suppose we have a nested hash here.
a = {:"0" => {:CA => {:count => 10}}}
if we want to add a new hash pair to that hash, say
a = {:"0" => {:NY => {:count => 11}}}
and let it become
a = {:"0" => {:CA => {:count =>10}, :NY => {:count => 11}}}
what should I do?
I've tried
a[:0][:NY][:count] = 11
but get the error "undefined method `[]=' for nil:NilClass (NoMethodError)"
You are getting the nil:NilClass error because you are trying to set a key of hash that doesn't exist yet. You need to create the hash that is the value of the key :NY.
a[:"0"].merge!({:NY => {:count => 11}})
or
a[:"0"][:NY] = {:count => 11}
My guess is that you want to do something like this.
a = {:"0" => {:CA => {:count => 10}}}
b = {:"0" => {:NY => {:count => 11}}}
a[:"0"][:NY] = b[:"0"][:NY] #=> {:"0"=>{:CA=>{:count=>10}, :NY=>{:count=>11}}}
You could also take advantage of merge
a = {:"0" => {:CA => {:count => 10}}}
b = {:"0" => {:NY => {:count => 11}}}
a[:"0"] = a[:"0"].merge(b[:"0"]) #=> {:"0"=>{:CA=>{:count=>10}, :NY=>{:count=>11}}}
Related
I'm trying to setup the smart_listing gem in my app. Where and how can I configure the default per page number of pagination results. In the docs of smart_listing is mentioned that it uses kaminari.
If you don't already have a config/initializers/kaminari_config.rb file, run Kaminari's config generator:
bundle exec rails generate kaminari:config
This will create config/initializers/kaminari_config.rb with the default content:
Kaminari.configure do |config|
# config.default_per_page = 25
# config.max_per_page = nil
# config.window = 4
# config.outer_window = 0
# config.left = 0
# config.right = 0
# config.page_method_name = :page
# config.param_name = :page
end
Simply uncomment and edit the configuration options you are interested in changing.
Update:
SmartListing provides it's own configuration options for pagination in config/initializers/smart_listing.rb:
SmartListing.configure do |config|
config.global_options({
#:param_names => { # param names
#:page => :page,
#:per_page => :per_page,
#:sort => :sort,
#},
#:array => false, # controls whether smart list should be using arrays or AR collections
#:max_count => nil, # limit number of rows
#:unlimited_per_page => false, # allow infinite page size
#:paginate => true, # allow pagination
#:memorize_per_page => false, # save per page settings in the cookie
#:page_sizes => DEFAULT_PAGE_SIZES, # set available page sizes array
#:kaminari_options => {:theme => "smart_listing"}, # Kaminari's paginate helper options
})
config.constants :classes, {
#:main => "smart-listing",
#:editable => "editable",
#:content => "content",
#:loading => "loading",
#:status => "smart-listing-status",
#:item_actions => "actions",
#:new_item_placeholder => "new-item-placeholder",
#:new_item_action => "new-item-action",
#:new_item_button => "btn",
#:hidden => "hidden",
#:autoselect => "autoselect",
#:callback => "callback",
#:pagination_per_page => "pagination-per-page text-center",
#:pagination_count => "count",
#:inline_editing => "info",
#:no_records => "no-records",
#:limit => "smart-listing-limit",
#:limit_alert => "smart-listing-limit-alert",
#:controls => "smart-listing-controls",
#:controls_reset => "reset",
#:filtering => "filter",
#:filtering_search => "glyphicon-search",
#:filtering_cancel => "glyphicon-remove",
#:filtering_disabled => "disabled",
#:sortable => "sortable",
#:icon_new => "glyphicon glyphicon-plus",
#:icon_edit => "glyphicon glyphicon-pencil",
#:icon_trash => "glyphicon glyphicon-trash",
#:icon_inactive => "glyphicon glyphicon-circle",
#:icon_show => "glyphicon glyphicon-share-alt",
#:icon_sort_none => "glyphicon glyphicon-resize-vertical",
#:icon_sort_up => "glyphicon glyphicon-chevron-up",
#:icon_sort_down => "glyphicon glyphicon-chevron-down",
}
config.constants :data_attributes, {
#:main => "smart-listing",
#:confirmation => "confirmation",
#:id => "id",
#:href => "href",
#:callback_href => "callback-href",
#:max_count => "max-count",
#:inline_edit_backup => "smart-listing-edit-backup",
#:params => "params",
#:observed => "observed",
#:href => "href",
#:autoshow => "autoshow",
#:popover => "slpopover",
}
config.constants :selectors, {
#:item_action_destroy => "a.destroy",
#:edit_cancel => "button.cancel",
#:row => "tr",
#:head => "thead",
#:filtering_icon => "i"
}
end
Uncomment the page_sizes line and replace DEFAULT_PAGE_SIZES with an array like [10, 20, 50, 100]
No need to comment out page_sizes in initializers/smart_listing.rb.
You can just define per_page value in controller, eg:
users_scope = User.all.includes(:bio)
users_scope = users_scope.like(params[:filter]) if params[:filter]
#users = smart_listing_create :users, users_scope, partial: "users/list", page_sizes: [5, 7, 13, 26]
smart_listing v1.1.2
I am using rails 2.3. In my application it uses
val = Party.find(:all, :conditions => [" type in ('Physician') || id in (?)",PartyLabel.find(:all,:conditions=>"label_id=#{Label.find_by_label("Can Schedule").id}").collect{|p| p.party_id if Party.find(p.party_id).respond_to?("provider_organizations")}], :with_disabled => true).select{|physician| not physician.provider_organizations.blank? }.collect{|enum| [enum.display_name_schedule, enum.id]}
code to achieve some requirements. Now i wants to split the code in to 2 parts.
1. phys = Physician.find(:all, :include => :provider_organizations, :with_disabled => true).select{|physician| not physician.provider_organizations.blank? }.collect{|enum| [enum.display_name_schedule, enum.id]}
it's working fine.. and the second part will be
2. sch = Party.find(:all, :include => [:as_labels], :conditions => {:label => {:label => "Can Schedule"}}.respond_to?("provider_organizations")).select{|physician| not physician.provider_organizations.blank? }.collect{|enum| [enum.display_name_schedule, enum.id]}
it shows NoMethodError (undefined method 'provider_organizations' for #<ProviderOrganization:0x1ab81c20>): error message... Any comments could be appreciated..
It looks like respond_to?("provider_organizations") is called for a wrong object. Here is your code #2:
sch = Party.find(
:all,
:include => [:as_labels],
:conditions => {
:label => {
:label => "Can Schedule"
}
}.respond_to?("provider_organizations") # What's this ???
).select{ |physician|
not physician.provider_organizations.blank?
}.collect{ |enum|
[enum.display_name_schedule, enum.id]
}
If I understand it correctly, the respond_to? should be inside the select:
...
).select{ |physician|
physician.respond_to?("provider_organizations") && not physician.provider_organizations.blank?
}.collect{ ...
I have an instance of an object that is created like this:
Example.create(:attrib0 => {
:attrib1 => value,
:attrib2 => [
{:attrib3 => value},
{:attrib4 => value}
]
})
How can I access :attrib4?
You should use serialize in your model, then you'll be able to return the hash correctly:
class SomeModel < ActiveRecord::Base
serialize :attrib0
end
Then the following should return the hash
hash = #model.attrib0
# => {:attrib1 => value, :attrib2 => [{:attrib3 => value}, {:attrib4 => value}]
# now to access attrib4 you need to get the attrib2 array,
# then grab attrib4 by its index:
hash[:attrib2][1]
# => {:attrib4 => value}
# or to get the value:
hash[:attrib2][1][:attrib4]
# => value
The above however can get quite complex and ugly, which is why I recommended creating another model for these attributes instead.
I think you should use nested attributes. Here's how it can be:
class Example
has_one :attrib0
accepts_nested_attributes_for :attrib0
end
params = { :attrib0 => { :attrib1 => value1,
:attrib2 => [ {:attrib3 => value3}, {:attrib4 => value4} ] }
}
example = Example.create(params[:attrib0])
example.attrib0.attrib1 #=> value1
example.attrib0.attrib2 #=> [ {:attrib3 => value3}, {:attrib4 => value4} ]
Using Ruby technique only:
h = {:attrib0 => {
:attrib1 => :value1,
:attrib2 => [
{:attrib3 => :value2},
{:attrib4 => :value3}
]
}}
p h[:attrib0][:attrib2].last[:attrib4] #=> :value3
I have totally nine buttons in rails. I have input the data into the database by manually typing the #button_1.save function.
My question is:
How can i have the #button_i.save function in rails? I have finished the things in the for loop, what is left is the button save functions.
Many thanks!
button_number = params[:button_number]
for i in (1..button_number)
instance_variable_set("#button#{i}",
Button.new(:title => params["button_title_#{i}".to_sym],
:order => i,
:icon_url => params["button_icon_#{i}".to_sym],
:navigation_id => #navigation.id,
:next_navigation => params["selected_navigation_#{i}".to_sym].to_i,
:next_page => params["selected_page_#{i}".to_sym].to_i))
instance_variable_set("#button#{i}")
end
#button1.save
#button2.save
#button3.save
#button4.save
#button5.save
#button6.save
for i in ...
eval("#button#{i}.save")
end
The opposite of instance_variable_set is instance_variable_get, which I think will lead you to the correct answer:
1.upto(params[:button_number].to_i) do |i|
instance_variable_set("#button#{i}",
Button.new(
:title => params["button_title_#{i}".to_sym],
:order => i,
:icon_url => params["button_icon_#{i}".to_sym],
:navigation_id => #navigation.id,
:next_navigation => params["selected_navigation_#{i}".to_sym].to_i,
:next_page => params["selected_page_#{i}".to_sym].to_i
)
)
instance_variable_get("#button#{i}").save
end
Try by using constantize ruby function because I think your function call statement is in string.
button_number = params[:button_number]
for i in (1..button_number)
instance_variable_set("#button#{i}",
Button.new(:title => params["button_title_#{i}".to_sym],
:order => i,
:icon_url => params["button_icon_#{i}".to_sym],
:navigation_id => #navigation.id,
:next_navigation => params["selected_navigation_#{i}".to_sym].to_i,
:next_page => params["selected_page_#{i}".to_sym].to_i))
"#button#{i}".constantize.save();
end
May be this that you want -
button_number = params[:button_number].to_i
for i in (1..button_number)
instance_variable_set("#button#{i}",
Button.new(:title => params["button_title_#{i}".to_sym],
:order => i,
:icon_url => params["button_icon_#{i}".to_sym],
:navigation_id => #navigation.id,
:next_navigation => params["selected_navigation_#{i}".to_sym].to_i,
:next_page => params["selected_page_#{i}".to_sym].to_i))
instance_variable_set("#button#{i}")
"#button#{i}".save
end
How am I able to create a hash within a hash, with the nested hash having a key to indentify it. Also the elements that I create in the nested hash, how can I have keys for them as well
for example
test = Hash.new()
#create second hash with a name?? test = Hash.new("test1")??
test("test1")[1] = 1???
test("test1")[2] = 2???
#create second hash with a name/key test = Hash.new("test2")???
test("test2")[1] = 1??
test("test2")[2] = 2??
thank you
Joel's is what I would do, but could also do this:
test = Hash.new()
test['test1'] = Hash.new()
test['test1']['key'] = 'val'
my_hash = { :nested_hash => { :first_key => 'Hello' } }
puts my_hash[:nested_hash][:first_key]
$ Hello
or
my_hash = {}
my_hash.merge!(:nested_hash => {:first_key => 'Hello' })
puts my_hash[:nested_hash][:first_key]
$ Hello
h1 = {'h2.1' => {'foo' => 'this', 'cool' => 'guy'}, 'h2.2' => {'bar' => '2000'} }
h1['h2.1'] # => {'foo' => 'this', 'cool' => 'guy'}
h1['h2.2'] # => {'bar' => '2000'}
h1['h2.1']['foo'] # => 'this'
h1['h2.1']['cool'] # => 'guy'
h1['h2.2']['bar'] # => '2000'