Oct 22 2007
I’ve spent time to understand test & fixtures, and sometimes it’s a bit long to check the SQL tables to create fixtures without forgetting one field.
this snippet really helped me but was a bit limited.
I’ve improved it like this:
#
# fixture_generator.rb
#
require_gem 'activerecord'
class RailsFixturesGenerator
def generate(class_name,number)
# Get the "Class" object from the class name
model_class = Object.const_get(class_name)
yaml_content = "# Read about fixtures at http://ar.rubyonrails.org/classes/Fixtures.html\n"
i=0
while i < number.to_i do
i+=1
i==1 ? yaml_content += "first:\n" : yaml_content += "item"+i.to_s+":\n"
model_class.columns.each { |column|
yaml_content += " " + column.name + ": "
case column.type
when :integer
yaml_content += i.to_s
when :text
yaml_content += column.name
yaml_content += i.to_s
when :string
st="string for item "+i.to_s+" "+column.name
yaml_content += st[0,column.limit]
when :datetime
yaml_content += Time.now.strftime("%Y-%m-%d %H:%M:%S")
else
st="content_unknown for "+column.type.to_s
yaml_content+=st[0,column.limit]
end
yaml_content += "\n"
}
yaml_content += "\n"
end
write_fixture_file(model_class, yaml_content)
yaml_content
end
# Write the <fixture> yaml file in the test/fixtures folder
def write_fixture_file(model_class, yaml_content)
path = ENV['DEST'] || "#{RAILS_ROOT}/test/fixtures"
db = ENV['DB'] || 'test'
File.open("#{path}/#{model_class.table_name}.yml", 'wb') do |file|
file.write yaml_content
file.close
end
end
end
It checks length of string fields, fill the datetime fields, etc… and you can choose how many records you want.
To use it:
Create a file called “fixture_generator.rb” in the /lib directory of your application
in a shell:
cd yourapp ruby script/console require ‘fixture_generator’ a=RailsFixturesGenerator.new a.generate(“Category”,3)You will have a file in /test/fixtures/categories.yml created with 3 complete records ready to be customized for your tests!
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