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I am using .select to assign a "line_id" to an "instance". The class "Instance" belongs_to "Line".

<%= line_builder.select('instance', 'line.line_id', Line.all.collect {|p| [p.title, p.id ]}, { :include_blank => 'select line' }) %>

this line returns this error:

undefined method `merge' for #<Array:0x007fc3c389e868>

Not quite sure whats going wrong here, but i'm assuming it's the syntax of the .select method because i've never used it before.

What else can I show you to help me figure this out?

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Try with options_for_select:

<%= line_builder.select(:line_id, Line.all.collect {|p| [p.title, p.id ]}, { :include_blank => 'select line' }) %>

Reason it was not working:

You had an extra argument in your select: A select in a Form builder takes as arguments the method to call for update (here line_id, so Rails will call line_id of the object and assign it the value of the select box), second argument is the options for the select, third option is the html_options as a Hash. As you had an extra argument, Rails was expecting your options to be the html_options hash, which was your options of the select.

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5 Comments

undefined method `merge' for #<ActiveSupport::SafeBuffer:0x007fc3c3c02630>on second line.
that second one seems to have done it... any chance you can explain to me why?
You had an extra argument in your select: A select in a Form builder takes as arguments the method to call for update (here line_id, so Rails will call line_id of the object and assign it the value of the select box), second argument is the options for the select, third option is the html_options as a Hash. As you had an extra argument, Rails was expecting your options to be the html_options hash, which was your options of the select. (hope It makes sense ...)
yes, that makes perfect sense, I feel a little misled by apidock.com which shows an additional "object" argument "select(object, method, choices, options = {}, html_options = {}) public"
Yes its confusing but here you are using a form_builder, which already knows the 'object' for the form.

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