Index_by rails

11 Nov 2007 Rails: Enumerable#index_by. Documentation. Convert an enumerable to a hash. Examples: people.index_by(&:login) => { "nextangle" =>  17 Jun 2019 index_with takes both value or a block as a parameter. Let's checkout how it works. Rails 5.2. Let's create a hash from an array in Rails 5.2 using 

It seems to be a common sense to have the useful implementation of Enumerable#index_by as in ActiveSupport. index_by acts like group_by but only maps a single record, instead of an array, keeping the last match only. It's usually used in places where you shouldn't have more than a single match for each key. mprobber force-pushed the tsun1215:index_errors branch 5 times, most recently from 695b20b to b8cbac1 Apr 8, 2015. `has_many` can now take `index_errors: true` as an option. When this is enabled, errors for nested models will be returned alongside an index, as opposed to just the nested model name. Graph and download economic data for Producer Price Index by Industry: Rail Transportation (PCU48214821) from Dec 1996 to Jan 2020 about railroad, transportation, PPI, industry, inflation, price index, price, indexes, and USA. Rails4で確認。オブジェクトが存在する場合は取得、なければ作成、ということがしたい場合にfind_or_create_byが使うと便利です。ですが、find_or_create_byだと新規作成の場合のみ特定の処理をさせたい、といった場合にnew_recordなのかどうか区別がつきません。

If a block is given instead of an argument, returns the index of the first object for which the block returns true. Returns nil if no match is found. See also Array#rindex. An Enumerator is returned if neither a block nor argument is given. Register or to add new notes.

index_by. Importance_1. Ruby on Rails latest stable (v5.2.3) - 0 notes - Class: Enumerable. 1.0.0; 1.1.6; 1.2.6 (0) · 2.0.3 (0) · 2.1.0 (0) · 2.2.1 (-1) · 2.3.2 (0) · 2.3.8   Ruby on Rails · Flowdock. method. index_by. Importance_1. v3.1.0 - Show latest stable - 0 notes - Class: Enumerable. 1.0.0; 1.1.6 protected. index_by() public. including,; index_by,; index_with index_with(default = INDEX_WITH_DEFAULT) Link %i( title body ).index_with { |attr_name| post. public_send(attr_name) }  11 Nov 2007 Rails: Enumerable#index_by. Documentation. Convert an enumerable to a hash. Examples: people.index_by(&:login) => { "nextangle" =>  17 Jun 2019 index_with takes both value or a block as a parameter. Let's checkout how it works. Rails 5.2. Let's create a hash from an array in Rails 5.2 using  changed it to find_index method. Now it's working def next_question index = campaign.quiz_questions.find_index self campaign.quiz_questions[index + 1] end.

…index-option-to-references Pare back default `index` option for the migration generator Hide details View details matthewd merged commit 235c759 into rails : master Jan 24, 2016 1 check passed

Using index_by in this way creates a Hash keyed to the abbr value. If abbr is non- unique and there are multiple records with the same value, this gets slightly 

12 Apr 2012 Rails' index_by: the easy way to convert an Array to a Hash As Aditya Sanghi notes in “Quickly convert an Array to a Hash”, a very quick way to 

including,; index_by,; index_with index_with(default = INDEX_WITH_DEFAULT) Link %i( title body ).index_with { |attr_name| post. public_send(attr_name) }  11 Nov 2007 Rails: Enumerable#index_by. Documentation. Convert an enumerable to a hash. Examples: people.index_by(&:login) => { "nextangle" =>  17 Jun 2019 index_with takes both value or a block as a parameter. Let's checkout how it works. Rails 5.2. Let's create a hash from an array in Rails 5.2 using  changed it to find_index method. Now it's working def next_question index = campaign.quiz_questions.find_index self campaign.quiz_questions[index + 1] end. 12 Apr 2012 Rails' index_by: the easy way to convert an Array to a Hash As Aditya Sanghi notes in “Quickly convert an Array to a Hash”, a very quick way to  #index_by ⇒ Object. Convert an enumerable to a hash. #many? ⇒ Boolean. Returns true if the enumerable has more than 1 element. #sum(identity = 0, &block) 

Graph and download economic data for Producer Price Index by Industry: Rail Transportation (PCU48214821) from Dec 1996 to Jan 2020 about railroad, transportation, PPI, industry, inflation, price index, price, indexes, and USA.

Los Angeles Railway/Los Angeles Transit Lines. Louisville & Nashville. Magma Arizona/San Manuel Copper If a block is given instead of an argument, returns the index of the first object for which the block returns true. Returns nil if no match is found. See also Array#rindex. An Enumerator is returned if neither a block nor argument is given. Register or to add new notes. gaurish wants to merge 2 commits into rails: master from unknown repository +72 −0 Conversation 5 Commits 2 Checks 0 Files changed 6 Conversation. Copy link Quote reply Contributor gaurish commented Sep 3, 2017. Fixes #27110. Initial POC to gather feedback & check if the approach is good. It seems to be a common sense to have the useful implementation of Enumerable#index_by as in ActiveSupport. index_by acts like group_by but only maps a single record, instead of an array, keeping the last match only. It's usually used in places where you shouldn't have more than a single match for each key.

index_by. Importance_1. Ruby on Rails latest stable (v5.2.3) - 0 notes - Class: Enumerable. 1.0.0; 1.1.6; 1.2.6 (0) · 2.0.3 (0) · 2.1.0 (0) · 2.2.1 (-1) · 2.3.2 (0) · 2.3.8   Ruby on Rails · Flowdock. method. index_by. Importance_1. v3.1.0 - Show latest stable - 0 notes - Class: Enumerable. 1.0.0; 1.1.6 protected. index_by() public.