datetime-select | 易学教程

MySQL average number of hours between created datetimes for a specific time interval

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问题 I have a table with a field called "created" which is a datetime field. Assume NOW() is midnight on 2013-07-21, so NOW() = 2013-07-21 23:59:59 Now let's say I query for all records WHERE created BETWEEN DATE_SUB(NOW(), INTERVAL 4 DAYS) AND NOW() Let's say that returns results like this: 2013-07-18 08:00:00 2013-07-19 08:00:00 2013-07-20 08:00:00 2013-07-21 08:00:00 I want to add the start and end datetime for the interval I used (4 days) to that result set, so now I have: 2013-07-18 00:00:00

Rails 3: datetime_select with am/pm options

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问题 In Rails 3, is there a way to use datetime_select and display hours showing 12 hour am/pm options rather than 24-hour options? 回答1: In case anyone stumbles upon this question, the answer for rails 3.2 is: <%= f.datetime_select :attribute_name, ampm: true %> 回答2: Here's the method I added to my helper class: def am_pm_hour_select(field_name) select_tag(field_name,options_for_select([ ["1 AM", "01"],["2 AM", "02"],["3 AM", "03"],["4 AM", "04"],["5 AM", "05"],["6 AM", "06"], ["7 AM", "07"],["8

Rails 3: datetime_select with am/pm options

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In Rails 3, is there a way to use datetime_select and display hours showing 12 hour am/pm options rather than 24-hour options? In case anyone stumbles upon this question, the answer for rails 3.2 is: <%= f.datetime_select :attribute_name, ampm: true %> Here's the method I added to my helper class: def am_pm_hour_select(field_name) select_tag(field_name,options_for_select([ ["1 AM", "01"],["2 AM", "02"],["3 AM", "03"],["4 AM", "04"],["5 AM", "05"],["6 AM", "06"], ["7 AM", "07"],["8 AM", "08"],["9 AM", "09"],["10 AM", "10"],["11 AM", "11"],["12 PM", "12"], ["1 PM", "13"],["2 PM", "14"],["3 PM",

How can I modify the input type of the Rails datetime_select helper?

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问题 I am using the Rails helper datetime_select in one of my forms. I currently have a requirement to change the dropdowns for day , year , hour , and minute to be textboxes with validation. Is there a way I can specify that I want textboxes for these fields? Or possibly a different helper that will do what I need? here is my usage: datetime_select(:campaign, :start_date, :order => [:day, :month, :year, :hour, :minute]) 回答1: how about rolling your own simple helper, like def datetime_text_fields

How can I modify the input type of the Rails datetime_select helper?

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I am using the Rails helper datetime_select in one of my forms. I currently have a requirement to change the dropdowns for day , year , hour , and minute to be textboxes with validation. Is there a way I can specify that I want textboxes for these fields? Or possibly a different helper that will do what I need? here is my usage: datetime_select(:campaign, :start_date, :order => [:day, :month, :year, :hour, :minute]) how about rolling your own simple helper, like def datetime_text_fields(object_name, method) html = text_field_tag("#{object_name}[#{method}(3i)]", Date.today.day.to_s, :length =>

What Does ActiveRecord::MultiparameterAssignmentErrors Mean?

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问题 I have a rails form with a datetime_select field. When I try to submit the form, I get the following exception: ActiveRecord::MultiparameterAssignmentErrors in WidgetsController#update 1 error(s) on assignment of multiparameter attributes If it's a validation error, why don't I see an error on the page? This is in Rails 2.0.2 回答1: It turns out that rails uses something called Multi-parameter assignment to transmit dates and times in small parts that are reassembled when you assign params to

What Does ActiveRecord::MultiparameterAssignmentErrors Mean?

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I have a rails form with a datetime_select field. When I try to submit the form, I get the following exception: ActiveRecord::MultiparameterAssignmentErrors in WidgetsController#update 1 error(s) on assignment of multiparameter attributes If it's a validation error, why don't I see an error on the page? This is in Rails 2.0.2 Jason Wadsworth It turns out that rails uses something called Multi-parameter assignment to transmit dates and times in small parts that are reassembled when you assign params to the model instance. My problem was that I was using a datetime_select form field for a date